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在viewcontroller里加上这句：
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(statusBarOrientationChange:)
name:UIDeviceOrientationDidChangeNotification object:nil];//屏幕旋转的通知
在通知的方法里加上这句：
-(void)statusBarOrientationChange:(NSNotification*)no{ NSDictionary* ntfDict = [no userInfo]; self.collectionView.frame = CGRectMake(0, 0, DF_WIDTH, DF_HEIGHT);//如果要重置view的大小的话，一定要加上这句 UIDeviceOrientation interfaceOrientation = [UIDevice currentDevice].orientation; if (interfaceOrientation == UIDeviceOrientationPortrait || interfaceOrientation == UIDeviceOrientationPortraitUpsideDown) { //翻转为竖屏时 count = 3; [self.collectionView reloadData]; }else if (interfaceOrientation==UIDeviceOrientationLandscapeLeft || interfaceOrientation == UIDeviceOrientationLandscapeRight) { //翻转为横屏时 count = 5; [self.collectionView reloadData]; } }
更全总结： [iOS]关于iOS中界面视图横屏/竖屏切换的问题总结：http://blog.csdn.net/lqq200912408/article/details/51088987
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原文地址：http://www.cnblogs.com/lucky-star-star/p/5787284.html
