Positioning UIWindow in UIScreen in iOS - ios

Question

I need to add additional UIWindow to my App. This UIWindow should always be positioned in the bottom right corner of the screen despite device's orientation, here's the sketch:
I've tried to subclass UIWindow like this to be able to set the size and the margins of window:
#interface MyWindow : UIWindow
#property (nonatomic) CGSize size;
#property (nonatomic) CGFloat margin;
#end
#implementation MyWindow
- (id)initWithSize:(CGSize)size andMargin:(CGFloat)margin {
self.size = size;
self.margin = margin;
return [self initWithFrame:[self calculateFrame]];
}
- (CGRect)calculateFrame {
return CGRectMake([[UIScreen mainScreen] bounds].size.width-self.size.width-self.margin, [[UIScreen mainScreen] bounds].size.height-self.size.height-self.margin, self.size.width, self.size.height);
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Initialization code
[self assignObservers];
}
return self;
}
-(void)assignObservers {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(statusBarDidChangeFrame:)
name:UIDeviceOrientationDidChangeNotification
object:nil];
}
- (void)statusBarDidChangeFrame:(NSNotification *)notification {
[self setFrame:[self calculateFrame]];
}
#end
Everything is great on startup! No matter what orientation is on initial start new UIWindow position is correct. But when I rotate device - my window goes crazy, it jumps to unexpected positions and I can't figure out why.
Please help!

Answer 1

Everything works fine if:
dispatch_async(dispatch_get_main_queue(), ^{
[self setFrame:[self calculateFrame]];
});
So full working code looks like this:
#interface MyWindow : UIWindow
#property (nonatomic) CGSize size;
#property (nonatomic) CGFloat margin;
#end
#implementation MyWindow
- (id)initWithSize:(CGSize)size andMargin:(CGFloat)margin {
self.size = size;
self.margin = margin;
return [self initWithFrame:[self calculateFrame]];
}
- (CGRect)calculateFrame {
return CGRectMake([[UIScreen mainScreen] bounds].size.width-self.size.width-self.margin, [[UIScreen mainScreen] bounds].size.height-self.size.height-self.margin, self.size.width, self.size.height);
}
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
// Initialization code
[self assignObservers];
}
return self;
}
-(void)assignObservers {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(statusBarDidChangeFrame:)
name:UIApplicationDidChangeStatusBarOrientationNotification
object:nil];
}
- (void)statusBarDidChangeFrame:(NSNotification *)notification {
dispatch_async(dispatch_get_main_queue(), ^{
[self setFrame:[self calculateFrame]];
});
}
#end
Many thanks to Cocoa-Chat and max.lunin :)