Presenting view controllers on detached view controllers is discouraged

解决方法- (void)viewDidAppear:(BOOL)animated 
{ 
[super viewDidAppear:animated]; 
[self presentViewController:[[YourViewController alloc] init] animated:YES completion:NULL]; 
}


或者：
- (void)viewDidLoad 
{ 
[super viewDidLoad]; 


dispatch_async(dispatch_get_main_queue(), ^{ 
YourViewController *v = [[YourViewController alloc] init]; 
[self presentViewController:v animated:YES completion:^{}]; 
}); 
}