ArcGIS Runtime SDK for iOS
100.15
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A layer that requests images from a tiled image server based on a URL template.
It provides a simple way to integrate non-ArcGIS services as a layer in a map.
The URL template usually follows a pattern similar to "https://{subDomain}.server.org/path/{level}/{col}/{row}.png", where:
The URL should be arranged to reflect how the tiles are organized in the cache or on the server, and can point to a web server ("https://...") or to a local file cache ("file://...").
The tiles retrieved by this class are accessed directly by URL. Because the service is only providing images, you are responsible for manually setting the attribution text on the map or scene view.
To create a custom service tiled layer whose URL follows the above pattern (or a similar pattern), you can extend this class. Alternatively, you can extend the super class AGSServiceImageTiledLayer
, in which you implement a required method to set the request information for a given LOD, column, and row. Extending AGSWebTiledLayer
, however, has no such requirement.
An AGSErrorCodeCommonInvalidArgument
will be passed in the load completion block when attempting to load a layer with an invalid template URL.
If AGSTileInfo
is not specified, tiles are assumed to be in the OpenStreetMap tiling scheme, with 256x256 PNG tiles at 96 DPI, the WebMercator projection, and a full extent of [-180, -85.0511, 180, 85.051].
Functional characteristics: Tiles are fetched on demand using the specified URL template. Tiles are typically pre-rendered (cached) on the server but may be generated on demand by some services. Web tiled layers do not support identify, query, selection, or time.
Tiles are fetched on demand using the specified URL template. Tiles are typically prerendered (cached) on the server but may be generated on demand by some services. Web tiled layers do not support identify, query, selection, or time.
Specifying subdomains from which the layer will request tiles allows the load to be more evenly distributed among servers.
Performance characteristics:
Web tiled layer requires a connection to the service at all times. Performance is similar to other raster tile layers.
AGSLayer
, Sample: Web tiled layer Instance Methods | |
(void) | - cancelLoad |
(void) | - doCancelLoading |
(void) | - doStartLoading: |
(id< AGSCancelable >) | - fetchLegendInfosWithCompletion: |
(instancetype) | - initWithTileInfo:fullExtent: |
(instancetype) | - initWithURLTemplate: |
(instancetype) | - initWithURLTemplate:subDomains: |
(instancetype) | - initWithURLTemplate:subDomains:tileInfo:fullExtent: |
(instancetype) | - initWithURLTemplate:tileInfo:fullExtent: |
(BOOL) | - isEqualToLayer: |
(BOOL) | - isVisibleAtScale: |
(void) | - loadDidFinishWithError: |
(void) | - loadWithCompletion: |
(void) | - onLoadStatusChanged |
(void) | - respondWithNoDataTileForTileKey: |
(void) | - respondWithTileKey:data:error: |
(void) | - retryLoadWithCompletion: |
Class Methods | |
(instancetype) | + imageTiledLayerWithTileInfo:fullExtent: |
(instancetype) | + serviceImageTiledLayerWithTiledInfo:fullExtent: |
(instancetype) | + webTiledLayerWithURLTemplate: |
(instancetype) | + webTiledLayerWithURLTemplate:subDomains: |
(instancetype) | + webTiledLayerWithURLTemplate:subDomains:tileInfo:fullExtent: |
(instancetype) | + webTiledLayerWithURLTemplate:tileInfo:fullExtent: |
Properties | |
NSString * | attribution |
float | brightness |
void(^ | cancelTileRequestHandler )(AGSTileKey *tileKey) |
BOOL | canChangeVisibility |
float | contrast |
AGSCredential * | credential |
AGSEnvelope * | fullExtent |
float | gamma |
BOOL | identifyEnabled |
AGSItem * | item |
NSString * | layerDescription |
NSString * | layerID |
NSError * | loadError |
AGSLoadStatus | loadStatus |
double | maxScale |
double | minScale |
NSString * | name |
AGSNoDataTileBehavior | noDataTileBehavior |
float | opacity |
AGSRequestConfiguration * | requestConfiguration |
BOOL | showInLegend |
AGSSpatialReference * | spatialReference |
NSArray< NSString * > * | subDomains |
NSArray< id< AGSLayerContent > > * | subLayerContents |
void(^ | subLayerContentsChangedHandler )(void) |
AGSTileInfo * | tileInfo |
void(^ | tileRequestHandler )(AGSTileKey *tileKey) |
NSURL * | URL |
NSURL *(^ | urlForTileKeyHandler )(AGSTileKey *tileKey) |
NSString * | URLTemplate |
BOOL | visible |
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requiredinherited |
Cancels loading if it is in progress, otherwise it does nothing. This should be called carefully because other objects could be waiting for loadWithCompletion:
or retryLoadWithCompletion:
to complete and this will call them all back with the error of NSUserCancelledError
- (void) doCancelLoading |
Never call this method directly. The framework calls this method on a background thread when cancelLoad (AGSLoadable-p)
is called. It is meant to be overriden by subclasses. Subclasses should override this method to cancel loading their data and call loadDidFinishWithError: (AGSLoadableBase(ForSubclassEyesOnly))
at the end passing in an error representing NSUserCancelledError
.
Provided by category AGSLoadableBase(ForSubclassEyesOnly).
- (void) doStartLoading: | (BOOL) | retrying |
Never call this method directly. The framework calls this method on a background thread when loadWithCompletion: (AGSLoadable-p)
or retryLoadWithCompletion: (AGSLoadable-p)
is called. It is meant to be overriden by subclasses. Subclasses should override this method to load their data and call loadDidFinishWithError: (AGSLoadableBase(ForSubclassEyesOnly))
upon completion, passing in the error if any.
retrying | flag that is true if this method was called from retryLoadWithCompletion: (AGSLoadable-p) . |
Provided by category AGSLoadableBase(ForSubclassEyesOnly).
- (id<AGSCancelable>) fetchLegendInfosWithCompletion: | (void(^)(NSArray< AGSLegendInfo * > *__nullable legendInfos, NSError *__nullable error)) | completion |
Fetches the array of legend infos (AGSLegendInfo
) for this layer.
+ (instancetype) imageTiledLayerWithTileInfo: | (AGSTileInfo *) | tileInfo | |
fullExtent: | (AGSEnvelope *) | fullExtent | |
Creates a custom tiled layer with the provided details.
tileInfo | specifying the tiling scheme used by the layer. |
fullExtent | of the layer. |
Provided by category AGSImageTiledLayer(CustomImageTiledLayer).
- (instancetype) initWithTileInfo: | (AGSTileInfo *) | tileInfo | |
fullExtent: | (AGSEnvelope *) | fullExtent | |
Initialize the custom tiled layer with the provided details
tileInfo | specifying the tiling scheme used by the layer |
fullExtent | of the layer |
Implements AGSImageTiledLayer.
Provided by category AGSServiceImageTiledLayer(CustomTiledLayer).
- (instancetype) initWithURLTemplate: | (NSString *) | URLTemplate |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. Since an explicit AGSTileInfo
argument is not part of this constructor, the max LOD will be 23 (approximate scale of 70 and resolution of 1.86 cm/pixel). The template URL usually follows a pattern similar to https://server.org/path/{level}/{col}/{row}.png, where "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. This URL should be arranged to reflect how the tiles are arranged in the cache or on the server. This URL can point to a web server (https://) or to a local file cache (file://). The tiles are assumed to be in the OpenStreetMap tiling scheme, with 256x256 PNG tiles at 96 DPI, the webMercator projection, and a fullExtents of [-180, -85.0511, 180, 85.051].
URLTemplate | for tile requests. |
- (instancetype) initWithURLTemplate: | (NSString *) | URLTemplate | |
subDomains: | (nullable NSArray< NSString * > *) | subDomains | |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. Since an explicit AGSTileInfo
argument is not part of this constructor, the max LOD will be 23 (approximate scale of 70 and resolution of 1.86 cm/pixel). The template URL usually follows a pattern similar to https://{subDomain}.server.org/path/{level}/{col}/{row}.png, where "subDomain" is one of the available string in the subDomains
array, "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. The subDomains
array must at least 1 string value to use the "subDomain" key in the URLTemplate
. The URL should be arranged to reflect how the tiles are arranged in the cache or on the server, and can point to a web server (https://) or to a local file cache (file://). The tiles are assumed to be in the OpenStreetMap tiling scheme, with 256x256 PNG tiles at 96 DPI, the webMercator projection, and a fullExtents of [-180, -85.0511, 180, 85.051].
URLTemplate | for tile requests. |
subDomains | An array of strings listing available sub-domains. It is used for load balancing tile requests if supported by the service, for eg. a,b,c for Open Cycle Map. If nil the URLTemplate should not contain {subDomain}. |
- (instancetype) initWithURLTemplate: | (NSString *) | URLTemplate | |
subDomains: | (nullable NSArray< NSString * > *) | subDomains | |
tileInfo: | (nullable AGSTileInfo *) | tileInfo | |
fullExtent: | (nullable AGSEnvelope *) | fullExtent | |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. The template URL usually follows a pattern similar to https://{subDomain}.server.org/path/{level}/{col}/{row}.png, where "subDomain" is one of the available string in the subDomains
array, "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. The subDomains
array must at least 1 string value to use the "subDomain" key in the template URL. This URL should be arranged to reflect how the tiles are arranged in the cache or on the server, and can point to a web server (https://) or to a local file cache (file://).
URLTemplate | The URL template for tile requests. |
subDomains | An array of strings listing available sub-domains. It is used for load balancing tile requests if supported by the service, for eg. a,b,c for Open Cycle Map. If nil , the URLTemplate should not contain {subDomain}. |
tileInfo | The tile info defining the tiling scheme. If nil , the open street map tiling scheme is used. |
fullExtent | The full extent of the tiles. If nil , the extent of the world in web mercator is used. |
- (instancetype) initWithURLTemplate: | (NSString *) | URLTemplate | |
tileInfo: | (nullable AGSTileInfo *) | tileInfo | |
fullExtent: | (nullable AGSEnvelope *) | fullExtent | |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. Since an explicit AGSTileInfo
argument is not part of this constructor, the max LOD will be 23 (approximate scale of 70 and resolution of 1.86 cm/pixel). The template URL usually follows a pattern similar to https://server.org/path/{level}/{col}/{row}.png, where "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. This URL should be arranged to reflect how the tiles are arranged in the cache or on the server. This URL can point to a web server (https://) or to a local file cache (file://). The tiles are assumed to be in the OpenStreetMap tiling scheme, with 256x256 PNG tiles at 96 DPI, the webMercator projection, and a fullExtents of [-180, -85.0511, 180, 85.051].
URLTemplate | for tile requests |
tileInfo | defining the tiling scheme. If nil the open street map tiling scheme is used. |
fullExtent | of the tiles. If nil the extent of the world in web mercator is used. |
- (BOOL) isEqualToLayer: | (AGSLayer *) | other |
- (BOOL) isVisibleAtScale: | (double) | scale |
Check whether this layer is visible at a given scale.
- (void) loadDidFinishWithError: | (nullable NSError *) | error |
Only subclasses should call this method in doStartLoading: (AGSLoadableBase(ForSubclassEyesOnly))
and doCancelLoading (AGSLoadableBase(ForSubclassEyesOnly))
when done loading or failed to load.
Provided by category AGSLoadableBase(ForSubclassEyesOnly).
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requiredinherited |
Loads data for the object asynchronously. The completion block is invoked upon completion.
You can call this method any number of times, however only one attempt is made to load the data. If it is already loading, it will just continue to load (i.e. not force a reload). If it has already loaded successfully, the completion block will be invoked right away. If it has already failed to load, the completion block will be invoked right away with error previously encountered. This method supports multiple callers and will call them all back on completion. However, each caller's completion block will be invoked once and only once.
completion | block that is invoked when object loads successfully or fails to load. An error is passed to the block if the object fails to load. |
- cancelLoad
to cancel loading - retryLoadWithCompletion:
to force reload - (void) onLoadStatusChanged |
Never call this method directly. The framework calls this method on a background thread when AGSLoadable::loadStatus
changes is called. Subclasses can optionally implement this to know when their loading status has changed.
Provided by category AGSLoadableBase(ForSubclassEyesOnly).
- (void) respondWithNoDataTileForTileKey: | (AGSTileKey *) | tileKey |
Needs to be invoked when the custom layer does not find a tile.
tileKey | specifying the tile that was requested. |
Provided by category AGSImageTiledLayer(CustomImageTiledLayer).
- (void) respondWithTileKey: | (AGSTileKey *) | tileKey | |
data: | (nullable NSData *) | data | |
error: | (nullable NSError *) | error | |
Needs to be invoked when the custom layer has successfully retrieved the tile requested in tileRequestHandler
, or if an error is encountered while retrieving the tile.
tileKey | specifying the tile that was requested. |
data | for the retrieved tile if the operation was successful. |
error | encountered while retrieving the tile if the operation failed. |
Provided by category AGSImageTiledLayer(CustomImageTiledLayer).
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requiredinherited |
Tries to reload when an object has failed to load. This method should be called judiciously. It should be called when:
cancelLoad
and then this methodIf the data hasn't started loading, it will start loading. If it is already loading, it will just continue to load. If it has already loaded successfully, calls back right away. If it has already failed to load, tries again. This method supports multiple callers and will call them all back on completion. However, each caller's completion block will be invoked once and only once.
completion | block that is invoked when object loads successfully or fails to load. An error is passed to the block if the object fails to load. |
+ (instancetype) serviceImageTiledLayerWithTiledInfo: | (AGSTileInfo *) | tileInfo | |
fullExtent: | (AGSEnvelope *) | fullExtent | |
Initialize the custom tiled layer with the provided details
tileInfo | specifying the tiling scheme used by the layer |
fullExtent | of the layer |
Provided by category AGSServiceImageTiledLayer(CustomTiledLayer).
+ (instancetype) webTiledLayerWithURLTemplate: | (NSString *) | URLTemplate |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. Since an explicit AGSTileInfo
argument is not part of this constructor, the max LOD will be 23 (approximate scale of 70 and resolution of 1.86 cm/pixel). The template URL usually follows a pattern similar to https://server.org/path/{level}/{col}/{row}.png, where "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. This URL should be arranged to reflect how the tiles are arranged in the cache or on the server. This URL can point to a web server (https://) or to a local file cache (file://). The tiles are assumed to be in the OpenStreetMap tiling scheme, with 256x256 PNG tiles at 96 DPI, the webMercator projection, and a fullExtents of [-180, -85.0511, 180, 85.051].
URLTemplate | The URL template for tile requests. |
+ (instancetype) webTiledLayerWithURLTemplate: | (NSString *) | URLTemplate | |
subDomains: | (nullable NSArray< NSString * > *) | subDomains | |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. Since an explicit AGSTileInfo
argument is not part of this initializer, the max LOD will be 23 (approximate scale of 70 and resolution of 1.86 cm/pixel). The template URL usually follows a pattern similar to https://{subDomain}.server.org/path/{level}/{col}/{row}.png, where "subDomain" is one of the available string in the subDomains
array, "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. The subDomains
array must have at least one string value to use the "subDomain" key in the URLTemplate
. The URL should be arranged to reflect how the tiles are arranged in the cache or on the server, and can point to a web server (https://) or to a local file cache (file://). The tiles are assumed to be in the OpenStreetMap tiling scheme, with 256x256 PNG tiles at 96 DPI, the webMercator projection, and a fullExtents of [-180, -85.0511, 180, 85.051].
URLTemplate | The URL template for tile requests. |
subDomains | An array of strings listing available sub-domains. It is used for load balancing tile requests if supported by the service, for eg. a,b,c for Open Cycle Map. If nil , the URLTemplate should not contain {subDomain}. |
+ (instancetype) webTiledLayerWithURLTemplate: | (NSString *) | URLTemplate | |
subDomains: | (nullable NSArray< NSString * > *) | subDomains | |
tileInfo: | (nullable AGSTileInfo *) | tileInfo | |
fullExtent: | (nullable AGSEnvelope *) | fullExtent | |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. The template URL usually follows a pattern similar to https://{subDomain}.server.org/path/{level}/{col}/{row}.png, where "subDomain" is one of the available string in the subDomains
array, "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. The subDomains
array must have at least one string value to use the "subDomain" key in the template URL. This URL should be arranged to reflect how the tiles are arranged in the cache or on the server, and can point to a web server (https://) or to a local file cache (file://).
URLTemplate | The URl template for tile requests. |
subDomains | An array of strings listing available sub-domains. It is used for load balancing tile requests if supported by the service, for eg. a,b,c for Open Cycle Map. If nil , the URLTemplate should not contain {subDomain}. |
tileInfo | The tile info defining the tiling scheme. If nil the open street map tiling scheme is used. |
fullExtent | The full extent of the tiles. If nil the extent of the world in web mercator is used. |
+ (instancetype) webTiledLayerWithURLTemplate: | (NSString *) | URLTemplate | |
tileInfo: | (nullable AGSTileInfo *) | tileInfo | |
fullExtent: | (nullable AGSEnvelope *) | fullExtent | |
Creates an AGSWebTiledLayer
object, which provides a simple way to integrate non-ArcGIS services as a layer in a map. Since an explicit AGSTileInfo
argument is not part of this constructor, the max LOD will be 23 (approximate scale of 70 and resolution of 1.86 cm/pixel). The template URL usually follows a pattern similar to https://server.org/path/{level}/{col}/{row}.png, where "level" corresponds to a zoom level, "col" represents the tile column, and "row" represents the tile row. This URL should be arranged to reflect how the tiles are arranged in the cache or on the server. This URL can point to a web server (https://) or to a local file cache (file://). The tiles are assumed to be in the OpenStreetMap tiling scheme, with 256x256 PNG tiles at 96 DPI, the webMercator projection, and a fullExtents of [-180, -85.0511, 180, 85.051].
URLTemplate | The URL template for tile requests. |
tileInfo | The tile info defining the tiling scheme. If nil , the open street map tiling scheme is used. |
fullExtent | The full extent of the tiles. If nil , the extent of the world in web mercator is used. |
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readwritenonatomiccopyinherited |
Attribution information of the layer.
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readwritenonatomicassigninherited |
The brightness of the layer's map image. Default value is 0. Values in the range -100.0 to 100.0 are valid. Values outside that range are ignored.
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readwritenonatomicstronginherited |
The handler that will be invoked when a requested tile is no longer needed. This should be assigned a block that contains the business logic specific to the custom layer for canceling the requested tile.
Provided by category AGSImageTiledLayer(CustomImageTiledLayer).
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readrequirednonatomicassigninherited |
Denotes whether the layer can change visibility or not.
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readwritenonatomicassigninherited |
The contrast of the layer's map image. Default value is 0. Values in the range -100.0 to 100.0 are valid. Values outside that range are ignored.
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readwritenonatomicstronginherited |
Security credentials to access the remote resource. Only applicable if the resource is secured.
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readnonatomicstronginherited |
Full extent of the layer.
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readwritenonatomicassigninherited |
The gamma of the layer's map image. Default value is 0. Values in the range -100.0 to 100.0 are valid. Values outside that range are ignored.
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readnonatomicassigninherited |
Specifies whether the layer supports identify.
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readnonatomicstronginherited |
The item the layer has been created from.
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readwritenonatomiccopyinherited |
The layer's description.
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readwritenonatomiccopyinherited |
The layer's ID specified in the web map item of ArcGIS Online or an on-premises portal.
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readnonatomicstronginherited |
The error that was encountered during the most recent load operation. Will be nil if the operation succeeded.
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readrequirednonatomicassigninherited |
Status of the load operation.
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readwritenonatomicassigninherited |
The maximum scale at which this layer is visible. If the map or scene is zoomed in beyond this scale, the layer will not be visible. A value of 0
means there is no maximum scale threshold and the layer will be visible at the smallest scale available for the map or scene.
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readwritenonatomicassigninherited |
The minimum scale at which this layer is visible. If the map or scene is zoomed out. beyond this scale, the layer will not be visible. A value of 0
means there is no minimum scale threshold and the layer will be visible at the largest scale available for the map or scene.
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readwritenonatomiccopyinherited |
The name of the layer.
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readwritenonatomicassigninherited |
Determines how a tile request that returns 'NoData' is resampled.
Zooming in can result in tile requests with no tiles at the requested level of detail.
In this case, there are options that control what to display where the tile should be:
AGSNoDataTileBehaviorUpSample
- Resample the pixels from a lower level of detail tile. This can result in pixelation or blurriness. This is the default behavior for operational layers.AGSNoDataTileBehaviorBlank
- The 'NoData' pixels will show the raster picture as being blank (or disappearing). This is the default behavior for basemap reference layers.AGSNoDataTileBehaviorShow
- This will show the raster picture with the text 'No Data' stamped over it once you pass the lowest level-of-detail scaleSometimes, to see the effect on the map when setting the AGSImageTiledLayer::noDataTileBehavior
property, the AGSLayer::maxScale
value must also be explicitly set. The AGSLayer::maxScale
property may need to be smaller than the level-of-detail setting that was used to create the tiled images in ArcGIS Pro or ArcGIS Desktop. For example, consider an operational image tiled layer showing forest cover that was created with the level-of-detail assumption that it was to be viewed above a scale of 5000 (meaning you will not see 'NoData' until you zoom closer to the Earth than a 5000 scale). However, you want to be able to zoom in closer to the Earth surface, say down to 3000 or 300. By setting the AGSLayer::maxScale
property to a number smaller than 5000, you will be able to zoom in closer to the Earth and see the effects of changing the AGSImageTiledLayer::noDataTileBehavior
enumerations.
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readwritenonatomicassigninherited |
The opacity of this layer as a value between 0 (fully transparent) and 1 (fully opaque). Default value is 1.
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readwritenonatomicstronginherited |
The AGSRequestConfiguration object which defines the behavior and policies to use when accessing the remote resource. The default will be nil. If it is nil the [AGSRequestConfiguration globalConfiguration] will be used.
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readwritenonatomicassigninherited |
Indicates whether to show legend information.
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readnonatomicstronginherited |
The spatial reference of the layer.
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readnonatomiccopy |
SubDomains used for load balancing tile requests if supported by the service, for eg. a,b,c for open cycle map. If the service does not support subDomains
, URLTemplate
should not contain {subDomain}.
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readnonatomiccopyinherited |
This layer's sub-layers.
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readwritenonatomiccopyinherited |
Block that is invoked when the sub layer contents changes.
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readnonatomicstronginherited |
Tiling scheme for the layer.
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readwritenonatomicstronginherited |
The handler that will be invoked when a new tile is needed. This should be assigned a block that contains the business logic specific to the custom layer for fetching the requested tile. The block should eventually invoke respondWithTileKey:data:error: (AGSImageTiledLayer(CustomImageTiledLayer))
if a tile is retrieved or an error is encountered. Alternatively, it can invoke #respondWithNoDataTileForTileKey
if no tile is available.
Provided by category AGSImageTiledLayer(CustomImageTiledLayer).
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readrequirednonatomicstronginherited |
The URL of the remote resource.
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readwritenonatomicstronginherited |
The handler that will be invoked when a new tile is needed. This should be assigned a block that contains the business logic specific to the custom layer for fetching the requested tile. The block should return a URL that can be used to fetch the remote data.
Provided by category AGSServiceImageTiledLayer(CustomTiledLayer).
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readnonatomiccopy |
URLTemplate of the tile service such as https://{subDomain}.host.com/{level}/{col}/{row}.png where {level} corresponds to a zoom level, and {col} and {row} represent tile column and row, respectively. The file extension may change depending upon the image format used by the service, and {subDomain} may not be present. This pattern is not required, but is the most common one on the web currently and used by Map Quest, Open Cycle Map, Stamen, Bing, etc. The template URL should be arranged to reflect how the tiles are arranged in the cache or on the server, and can point to a web server (https://) or to a local file cache (file://).
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readwritenonatomicassigninherited |
Denotes whether the layer is visible or not. The visibility changes can be monitored using Key-Value Observing (KVO).