AGSSymbolStyle Class Reference

Description

A symbol style object.

An AGSSymbolStyle is created either from a style file on disk (an SQLite database with a .stylx extension, created with ArcGIS Pro) or from a style file hosted on ArcGIS Online or an ArcGIS Enterprise portal (also referred to as a web style).

When used by itself, the symbol style supports two key workflows. One is to return a symbol based on a provided set of key values. Since each symbol in the style has a key that uniquely identifies it, you can pass an array of keys into AGSSymbolStyle::symbolWithKeys:completion: to return a new AGSSymbol built from the individual symbols represented by those keys. You might use this symbol to create a new AGSGraphic.

The other common workflow is to use a standalone symbol style to search for symbol primitives. Symbol primitives are the individual symbols that compose more complex symbols. This is achieved using AGSSymbolStyle::searchSymbolsWithSearchParameters:completion:. You could create a symbol picker app, for example, that searches for all symbols in the style that have the tag "maritime" in it. The search results contain symbols that you could use directly. You could also extract their individual symbol components to create a new multilayer symbol.

See also

AGSDictionarySymbolStyle

Since

100

Inheritance diagram for AGSSymbolStyle:

Instance Methods
(void)	- cancelLoad
(id< AGSCancelable >)	- defaultSearchParametersWithCompletion:
(void)	- doCancelLoading
(void)	- doStartLoading:
(instancetype)	- initWithName:
(instancetype)	- initWithPortalItem:
(instancetype)	- initWithStyleName:portal:
(instancetype)	- initWithURL:
(void)	- loadDidFinishWithError:
(void)	- loadWithCompletion:
(void)	- onLoadStatusChanged
(void)	- retryLoadWithCompletion:
(id< AGSCancelable >)	- searchSymbolsWithParameters:completion:
(id< AGSCancelable >)	- symbolForKeys:completion:

Class Methods
(instancetype)	+ symbolStyleWithName:
(instancetype)	+ symbolStyleWithPortalItem:
(instancetype)	+ symbolStyleWithStyleName:portal:
(instancetype)	+ symbolStyleWithURL:

Properties
AGSCredential *	credential
NSError *	loadError
AGSLoadStatus	loadStatus
AGSPortal *	portal
AGSPortalItem *	portalItem
AGSRequestConfiguration *	requestConfiguration
NSString *	styleName
NSURL *	URL

Method Documentation

cancelLoad

- (void) cancelLoad

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

Since

100

defaultSearchParametersWithCompletion:

- (id<AGSCancelable>) defaultSearchParametersWithCompletion:

(void(^)(AGSSymbolStyleSearchParameters *__nullable searchParams, NSError *__nullable error))

completion

A convenience method to get properly initialized search parameters for looking up symbols within the .stylx file. The parameters contain all of the possible input values for categories, keys, names, symbolClasses, and tags. This is an expensive task that should be used sparingly. Returns a AGSSymbolStyleSearchParameters object providing all available search parameters from the database.

This asynchronous task retrieves all the valid input search parameters for a style. This means you get all of the possible input values for categories, keys, names, symbolClasses, and tags. This is an expensive task that should be used sparingly.

Parameters

completion

Block that is invoked when the operation finishes. The searchParams parameter is populated if the operation completed successfully, otherwise the error parameter is populated.

See also

- searchSymbolsWithParameters:completion:

Since

100

doCancelLoading

- (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.

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

doStartLoading:

- (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.

Parameters

retrying

flag that is true if this method was called from retryLoadWithCompletion: (AGSLoadable-p).

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

initWithName:

- (instancetype) initWithName:

(NSString *)

name

Initialize a symbol style with the name of a .stylx file that is within the application bundle or shared documents directory.

Parameters

name	of the .stylx file (without the file extension) within the application bundle or shared documents directory.

Returns

a new initialized symbol style

Since

100

Implemented in AGSDictionarySymbolStyle.

initWithPortalItem:

- (instancetype) initWithPortalItem:

(AGSPortalItem *)

portalItem

Creates a new symbol style object from a portal item. The portal item must contain a style.

If you have the item id of a style file, you can search the portal to find the item using its item id. Use this initializer if you have a reference to a portal item.

Parameters

portalItem

An AGSPortalItem that contains a web style.

Since

100.10

Implemented in AGSDictionarySymbolStyle.

initWithStyleName:portal:

- (instancetype) initWithStyleName:		(NSString *)	styleName
portal:		(nullable AGSPortal *)	portal

Creates a new symbol style object using the registered style name of the Esri web style on the portal.

Esri provides a set of web symbol styles "out of the box" for localized use with ArcGIS Online and Enterprise. This initializer can be used only while creating a symbol style using the Esri web style's unique name on your portal or arcgis.com. An overview of esri web styles and symbols currently in production is available for 3D and 2D.

Tip: Click on the symbol icon to find its associated style name. Esri registered style names can also be found in the json of symbol web style. As an example, see item json for EsriThematicShapesStyle hosted on ArcGIS Online.

Parameters

styleName	The registered Esri symbol style name. It cannot be a custom web style name.
portal	A Portal hosting the Esri web style. If nil is passed, ArcGIS online is used as the default portal.

Since

100.10

initWithURL:

- (instancetype) initWithURL:

(NSURL *)

URL

Initialize a symbol style with the specified .stylx file or using web style item URL. For example, https://www.arcgis.com/home/item.html?id=bf27400d167d4c2e8e12c8a46f87afe4 is the URL of the "Basic Shapes" style on ArcGIS Online.

Parameters

URL	to a .stylx file on disk or to web style item.

Returns

a new initialized symbol style

Since

100

Implemented in AGSDictionarySymbolStyle.

loadDidFinishWithError:

- (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.

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

loadWithCompletion:

- (void) loadWithCompletion: (nullable void(^)(NSError *__nullable error))  completion

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.

Parameters

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.

Note

The completion block is always invoked on the main thread.

Since

100

See also

- cancelLoad to cancel loading

- retryLoadWithCompletion: to force reload

onLoadStatusChanged

- (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.

Since

100

Provided by category AGSLoadableBase(ForSubclassEyesOnly).

retryLoadWithCompletion:

- (void) retryLoadWithCompletion: (nullable void(^)(NSError *__nullable error))  completion

requiredinherited

Tries to reload when an object has failed to load. This method should be called judiciously. It should be called when:

1. you didn't have network connectivity earlier when it failed and you want to retry now that you have connectivity
2. the server was down earlier when it failed and you want to retry
3. the request is taking too long and you want to cancel it and retry, in which case you will first call cancelLoad and then this method

If 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.

Parameters

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.

Note

The completion block is always invoked on the main thread.

Since

100

searchSymbolsWithParameters:completion:

- (id<AGSCancelable>) searchSymbolsWithParameters:		(AGSSymbolStyleSearchParameters *)	searchParameters
completion:		(void(^)(NSArray< AGSSymbolStyleSearchResult * > *__nullable searchResults, NSError *__nullable error))	completion

Returns an array of AGSSymbolStyleSearchResult objects.

This asynchronous task searches for symbol primitives in the symbol style. The input searchParameters define what is searched for. For example, you could search for all symbols that have the tag "airspace". You can also set the match to be strict or not, which will determine if the search uses "=" or "LIKE" for each parameter.

Parameters

searchParameters	an object of type AGSSymbolStyleSearchParameters.
completion	Block that is invoked when the operation finishes. The searchResults parameter is populated if the operation completed successfully, otherwise the error parameter is populated.

See also

- defaultSearchParametersWithCompletion:

Since

100

symbolForKeys:completion:

- (id<AGSCancelable>) symbolForKeys:		(NSArray< NSString * > *)	keys
completion:		(void(^)(AGSSymbol *__nullable symbol, NSError *__nullable error))	completion

Asynchronously returns a symbol based on the provided list of keys.

This function is useful for obtaining a single, multi-layer symbol from supplied keys. This is commonly used to create symbols and graphics on-the-fly. For example, assume XYZ style has a symbol with key "abc" which is the central symbol and another symbol with key "pqr", which could be the modifier/echelon placed at some offset from central geometry. So if you provide these two keys as attributes then symbol style will find and assemble a symbol accordingly. Once you have that symbol, you can apply it to a Graphic or Renderer, obtain its swatch image, or serialize to JSON. If the Symbol style is not loaded then starting this task will start the load cycle.

Parameters

keys	NSArray of strings. It is the list of keys required to obtain a symbol from the style.
completion	block that is invoked with the result

Since

100

symbolStyleWithName:

+ (instancetype) symbolStyleWithName:

(NSString *)

name

Initialize a symbol style with the name of a .stylx file that is within the application bundle or shared documents directory.

Parameters

name	of the .stylx file (without the file extension) within the application bundle or shared documents directory.

Returns

a new initialized symbol style

Since

100

symbolStyleWithPortalItem:

+ (instancetype) symbolStyleWithPortalItem:

(AGSPortalItem *)

portalItem

Creates a new symbol style object from a portal item. The portal item must contain a style.

If you have the item id of a style file, you can search the portal to find the item using its item id. Use this initializer if you have a reference to a portal item.

Parameters

portalItem

An AGSPortalItem that contains a web style.

Since

100.10

symbolStyleWithStyleName:portal:

+ (instancetype) symbolStyleWithStyleName:		(NSString *)	styleName
portal:		(nullable AGSPortal *)	portal

Creates a new symbol style object using the unique registered name for the web style on the portal.

Esri provides a set of web symbol styles "out of the box" for localized use with ArcGIS Online and Enterprise. This initializer can be used only while creating a symbol style using the Esri web style's unique name on your portal or arcgis.com. An overview of esri web styles and symbols currently in production is available for 3D and 2D.

Tip: Click on the symbol icon to find its associated style name. Esri registered style names can also be found in the json of symbol web style. As an example, see item json for EsriThematicShapesStyle hosted on ArcGIS Online.

Parameters

styleName	The registered Esri symbol style name. It cannot be a custom web style name.
portal	A Portal hosting the Esri web style. If nil is passed, ArcGIS online is used as the default portal.

Since

100.10

symbolStyleWithURL:

+ (instancetype) symbolStyleWithURL:

(NSURL *)

URL

Initialize a symbol style with the specified .stylx file or using web style item URL. For example, https://www.arcgis.com/home/item.html?id=bf27400d167d4c2e8e12c8a46f87afe4 is the URL of the "Basic Shapes" style on ArcGIS Online.

Parameters

URL	to a .stylx file on disk or to web style item.

Returns

a new initialized symbol style

Since

100

Property Documentation

credential

- (AGSCredential*) credential

readwritenonatomicstronginherited

Security credentials to access the remote resource. Only applicable if the resource is secured.

Since

100

loadError

- (NSError*) loadError

readnonatomicstronginherited

The error that was encountered during the most recent load operation. Will be nil if the operation succeeded.

Since

100

loadStatus

- (AGSLoadStatus) loadStatus

readrequirednonatomicassigninherited

Status of the load operation.

Since

100

portal

- (AGSPortal*) portal

readnonatomicstrong

The portal that hosts the web style identified with AGSSymbolStyle::styleName. This will be nil if the style was identified with a AGSPortalItem or URL or a local .stylx file on disk.

Since

100.10

portalItem

- (AGSPortalItem*) portalItem

readnonatomicstrong

The portal item representing the web style.

This is non nil when the AGSSymbolStyle is created using initWithPortalItem: or initWithURL: by providing a web style item.

This will be nil if the style was created or is identified with a local .stylx file on disk.

Since

100.10

requestConfiguration

- (AGSRequestConfiguration*) requestConfiguration

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.

Since

100

styleName

- (NSString*) styleName

readnonatomiccopy

The name of the web style. This will be empty if the style was identified with a URL or a AGSPortalItem or a local .stylx file on disk.

Since

100.10

URL

- (NSURL*) URL

readrequirednonatomicstronginherited

The URL of the remote resource.

Since

100