IOS基礎之iPad的屏幕旋轉方向判斷

#pragma mark - 屏幕旋轉 - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator{UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout*)self.collectionViewLayout;NSInteger col = size.width > size.height == YES ? 3 : 2;if(size.width > size.height){//橫屏CGFloat inset = (size.width - col * 305) / (col + 1);layout.sectionInset = UIEdgeInsetsMake(inset, inset, inset, inset);layout.minimumLineSpacing = inset;}else{//豎屏CGFloat inset = (size.width - col * 305) / (col + 1);layout.sectionInset = UIEdgeInsetsMake(inset, inset, inset, inset);layout.minimumLineSpacing = inset;}CGFloat inset = (size.width - col * layout.itemSize.width) / (col + 1);layout.sectionInset = UIEdgeInsetsMake(inset, inset, inset, inset);layout.minimumLineSpacing = inset; }

重寫viewWillTransitionToSize，通過判斷size.height 和size.width
來判斷方向，

如何初始化屏幕的方向，
在viewDidLoad里面書寫

[self viewWillTransitionToSize:[UIScreen mainScreen].bounds.size withTransitionCoordinator:self.transitionCoordinator];

通過動態的計算UICollectionCell的Item 大小的上下間距和外邊距等值，
通過三元運算對列數進行賦值。橫屏3列，豎屏2列。通過collectionViewLayout父類進行強制轉換成子類的流水(流式)布局。拿到layout

總結

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