Question

I have a subview added on app relaunch, on the applicationDidBecomeActive got called, but it’s not shown, what could be the reason?

- (UIView *)mySubView {
    if (_mySubView == nil) {
       _mySubView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
       _mySubView.opaque = NO;
       _mySubView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5f];
       _mySubView.exclusiveTouch = YES;
       [_mySubView setUserInteractionEnabled:NO];
    }

    return _mySubView;
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
    UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:0];
    [window addSubview:[self mySubView]];
}

What’s more interesting is that – it’ll shown if I leave the app launched, turn off the device, then turn the device back on. But if I close the app, then relaunch it, I won’t be able to see the subview.

Answer 1

Please add the following line like this,

- (void)applicationDidBecomeActive:(UIApplication *)application     
{

   UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:0];

   [window addSubview:[self mySubView]];

   [window makeKeyAndVisible];

 }

and also change the color [UIColor blueColor];

You will see the effect sure

Enjoy!