Synchronously runs a block that requests changes to be performed in the photo library.
- iOS 8.0+
- macOS 10.13+
- tvOS 10.0+
A block that requests changes to be performed.
This block takes no parameters and has no return value.
If an error occurs, this pointer is set to an
NSErrorobject describing the error. If you do not want error information, pass in
true if Photos successfully applied the changes requested in the block; otherwise,
Do not call this method from the main thread. Your change block, and the work that Photos performs on your behalf to apply the changes it requests, take some time to execute. (Photos may need to prompt the user to perform changes, so this method can block execution indefinitely.) Use this method if you are already performing work on a background queue that results in a change to be applied to the Photos library. To request changes from the main queue, use the
perform method instead.