ArcGIS Runtime SDK for iOS
100.15
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An object that defines the text, appearance and position of labels for features for a given scale range. An AGSLabelingInfo
describes a class of labels.
Each AGSLabelingInfo
specifies:
AGSLabelingInfo::where
SQL constraint AGSLabelingInfo::labelExpression
formula AGSLabelingInfo::symbol
property AGSLabelingInfo::labelPlacement
property AGSLabelingInfo
describes a very limited subset of the AGSLabelDefinition
properties. Properties | |
NSString * | labelExpression |
AGSLabelingPlacement | labelPlacement |
double | maxScale |
double | minScale |
AGSSymbol * | symbol |
BOOL | useCodedValues |
NSString * | where |
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readnonatomiccopy |
Simple expression describing how to build the text label for a feature, often using attributes of the feature. The default is an empty expression and no labels will be produced.
The Simple expression format is described at https://developers.arcgis.com/documentation/common-data-types/labeling-objects.htm e.g. "\"Addr: " CONCAT [Name] CONCAT " Street"" (the outer quotes are not part of the expression, but quotes are needed around the literal text).
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readnonatomicassign |
The preferred position of the text label, with respect to its feature geometry.
The default depends on the type of feature geometry:
AGSLabelingPlacementPointAboveRight
for point features AGSLabelingPlacementPolygonAlwaysHorizontal
for polygon features AGSLabelingPlacementLineAboveAlong
for line features
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readnonatomicassign |
Labels will only be visible when the viewing scale is smaller than (or equal to) the maxScale. For example, if the viewing scale is 1:12000 and the AGSLabelingInfo::maxScale
is 1:10000, then the labels will be visible (because 1/12000 <= 1/10000).
An AGSLabelingInfo::maxScale
of 0, which is the default, indicates no upper limit on the viewing scale.
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readnonatomicassign |
Labels will only be visible when the viewing scale is larger than (or equal to) the minScale. For example, if the viewing scale is 1:12000 and the AGSLabelingInfo::minScale
is 1:20000, then the labels will be visible (because 1/12000 >= 1/20000).
An AGSLabelingInfo::minScale
of 0, which is the default, indicates no lower limit on the viewing scale.
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readnonatomicstrong |
The text symbol which describes the overall appearance of label text (e.g. font and size). If no AGSLabelingInfo::symbol
has been set, then no labels can be created.
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readnonatomicassign |
Whether the data source should translate domain identifiers into meanings using an AGSCodedValueDomain
. For any translation to occur, the data source must have one or more AGSCodedValueDomain
set up for the attribute fields.
The default value is NO
i.e. no translation will be done.
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readnonatomiccopy |
Limit the set of features for which labels will be generated and placed. For example, "[address] LIKE '% Danube %'" labels all features with an address attribute that contains the string " Danube ". This is a SQL expression that can refer to the attributes of the feature e.g.
The default value is ""
.