在iOS中的UIScreen中定位UIWindow

Question

我需要向我的應用添加其他UIWindow 。 無論設備的方向如何，此UIWindow都應始終位於屏幕的右下角，這是草圖：

我試圖像這樣子類化UIWindow以便能夠設置窗口的大小和邊距：

@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

一切都很好啟動！ 無論最初啟動時是什么方向，新的UIWindow位置都是正確的。 但是，當我旋轉設備時-我的窗口發瘋了，它跳到了意外的位置，我不知道為什么。

請幫忙！

Answer 1

在以下情況下一切正常：

dispatch_async(dispatch_get_main_queue(), ^{
    [self setFrame:[self calculateFrame]];
}); 

因此完整的工作代碼如下所示：

@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

非常感謝Cocoa-Chat和max.lunin :)