iOS nsthred multithreading easy to use

On the way to nsthred open multithreading

-(void) Performselectorinbackground: (SEL) Aselector withobject: (ID) arg

[Self Performselectorinbackground: @selector (dosomething) Withobject:nil];

This method is to open another thread, which is used in the DoSomething method to handle time-consuming operations

To return to the main thread when the UI refresh process is required:

-(void) Performselectoronmainthread: (SEL) Aselector withobject: (ID) arg waituntildone: (BOOL) wait;

// UI Refresh    [Self Performselectoronmainthread: @selector (Refreshui) Withobject:nil Waituntildone:no];

Or

// UI Refresh    Dispatch_async (Dispatch_get_main_queue (), ^{        NSLog (@ "refreshui" );    });

iOS nsthred multithreading easy to use