How to add UIView on the top of all views?

Question

I have such code:

@interface Alert : UIView  {  } /* - (void) initWithTitle:(NSString*)title message:(NSString*)message cancelButtonTitle:(NSString*)cancelButtonTitle otherButtonTitles:(NSString*)buttonTitle,... delegate:(id)delegate; */ @end   @implementation Alert  - (void) drawRect:(CGRect)rect  {     CGContextRef context = UIGraphicsGetCurrentContext();     CGContextClearRect(context, rect); // Очистим context      CGContextSetRGBFillColor(context, 255, 0, 0, 1);     CGContextFillRect(context, CGRectMake(20, 20, 100, 100)); }  - (void) show {     self.center = [[[UIApplication sharedApplication] keyWindow] center];     [[[UIApplication sharedApplication] keyWindow] addSubview:self];     [[[UIApplication sharedApplication] keyWindow] bringSubviewToFront:self]; } 

Then I'm use it so:

- (void)viewDidLoad {     [super viewDidLoad];      Alert * alert = [[Alert alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];     [alert show];     [alert release]; } 

But it doesn't work(I want to see Alert above all other views). Could you help me?

Answer 1

The recommended solutions which handle device orientation properly are

• pod AGWindowView It will automatically deal with any rotation and framechanges so you won't have to worry about that.
• read and follow the official post https://developer.apple.com/library/content/qa/qa1688/_index.html

• Add your view to the first subview, instead of adding it to the window
  

  UIWindow* window = [UIApplication sharedApplication].keyWindow; if (!window)      window = [[UIApplication sharedApplication].windows objectAtIndex:0]; [[[window subviews] objectAtIndex:0] addSubview:myView]; 

You can also add it to the window. It will not handle device orientation, though.

let window = UIApplication.sharedApplication().keyWindow! let view = UIView(frame: CGRect(x: window.frame.origin.x, y: window.frame.origin.y, width: window.frame.width, height: window.frame.height)) window.addSubview(v); view.backgroundColor = UIColor.blackColor()