Task Manager

//Header File typedef void (^TaskBlock)(void); typedef void (^TaskCompletedBlock)(void); @interface FCTaskManager : NSObject -(void)performUITask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock; -(void)performBackgroundTask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock; @end //Implementation #import "FCTaskManager.h" @implementation FCTaskManager -(void)performUITask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock { dispatch_async( dispatch_get_main_queue(), ^{ @autoreleasepool { taskBlock(); dispatch_async( dispatch_get_main_queue(), ^{ taskCompletedBlock(); }); } }); } -(void)performBackgroundTask:(TaskBlock)taskBlock completionBlock:(TaskCompletedBlock)taskCompletedBlock { dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ @autoreleasepool { taskBlock(); dispatch_async( dispatch_get_main_queue(), ^{ taskCompletedBlock(); }); } }); } @end Then I can use the task manager like so: -(void)viewDidLoad { [super viewDidLoad]; //Create taskManager taskManager = [[FCTaskManager alloc] init]; //Create UIViews, etc WITHOUT blocking main queue [taskManager performUITask:^{ button = [[UIButton alloc] initWithFrame:CGRectMake(30, 30, 300, 300)]; [button setBackgroundColor:[UIColor redColor]]; [button setTitle:@"Working" forState:UIControlStateNormal]; [button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside]; } completionBlock:^{ NSLog(@"CREATED BUTTON"); [self.view addSubview:button]; }]; }