Ios7 如何获取canDisplayBannerAds生成viewDidLayoutSubview回调？

在我的代码中，当我在视图控制器上设置

candisplaybanerads=YES

时，我会在广告消失时（而不是广告出现时）回调到

viewdilayoutsubviews

。我猜这是因为当您将

candisplaybanerads

设置为YES时，苹果将视图控制器的原始self.view移动到

self.originalContentView

---

我的问题是，什么是合理的解决方法？

我解决这个问题的方法是在设置canDisplayBannerAds=YES之前用覆盖LayoutSubView的UIView替换self.view

@protocol LayoutViewDelegate <NSObject>
- (void) layout;
@end

@interface LayoutView : UIView
@property (nonatomic, weak) id<LayoutViewDelegate> delegate;
@end
@implementation LayoutView
- (void) layoutSubviews {
    [super layoutSubviews];
    if (self.delegate) [self.delegate layout];
}
@end

在我看来，我确实：

- (void) viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    if ([Utilities ios7OrLater]) {
        self.canDisplayBannerAds = YES;
    }
}

我添加了委托方法：

// This *always* gets called when the banner ad appears or disappears.
#pragma - LayoutViewDelegate method
- (void) layout {
   // do useful stuff here
}
#pragma -

// This *always* gets called when the banner ad appears or disappears.
#pragma - LayoutViewDelegate method
- (void) layout {
   // do useful stuff here
}
#pragma -