Flag Change Observers Reference


                    
                    
                    LDObserverOwner

An object can own an observer for as long as the object exists. Swift structs and enums cannot be observer owners.

Swift

public typealias LDObserverOwner


                    
                    
                    LDChangedFlag

Collects the elements of a feature flag that changed as a result of the SDK receiving an update.

The SDK will pass a LDChangedFlag or a collection of LDChangedFlags into feature flag observer closures. See LDClient.observe(key:owner:handler:), LDClient.observe(keys:owner:handler:), and LDClient.observeAll(owner:handler:) for more details.

Swift

public struct LDChangedFlag


                    
                    
                    LDFlagChangeHandler

A closure used to notify an observer owner of a change to a single feature flag’s value.

Swift

public typealias LDFlagChangeHandler = (LDChangedFlag) -> Void


                    
                    
                    LDFlagCollectionChangeHandler

A closure used to notify an observer owner of a change to the feature flags in a collection of LDChangedFlag.

Swift

public typealias LDFlagCollectionChangeHandler = ([LDFlagKey : LDChangedFlag]) -> Void


                    
                    
                    LDFlagsUnchangedHandler

A closure used to notify an observer owner that a feature flag request resulted in no changes to any feature flag.

Swift

public typealias LDFlagsUnchangedHandler = () -> Void