iOS 来电 导致布局变化的解决方案

[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(statusFrameChanged:)
name:UIApplicationWillChangeStatusBarFrameNotification
object:nil];

-(void) statusFrameChanged:(NSNotification*) note
{
CGRect statusBarFrame = [note.userInfo[UIApplicationStatusBarFrameUserInfoKey] CGRectValue];
CGFloat statusHeight = statusBarFrame.size.height;

UIScreen *screen = [UIScreen mainScreen];
CGRect viewRect = screen.bounds;

viewRect.size.height -= statusHeight;
viewRect.origin.y = statusHeight;

self.view.frame = viewRect;
[self.view setNeedsLayout];
}