問題描述：
在部分使用collectionView封裝ViewController的頁面時锹雏，如果需要presentviewcontroller到部分橫屏頁面進行相關操作時亡笑，會導致collectionView滑動而對未初始化的ViewController進行ViewDidLoad操作导饲，這時候如果定義了宏獲取View.bounds時會發(fā)現獲取到的是橫屏的bounds，但是ViewController使用的是豎屏渠欺，這時候BUG出現虱颗。要解決presentviewcontroller時不讓collectionView進行無關的滑動，這時候需要在為collectionView的contentInsetAdjustmentBehavior屬性賦值為UIScrollViewContentInsetAdjustmentNever即可解決聪黎。如下：
collectionView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever
擴展：
UIScrollView的contentInsetAdjustmentBehavior屬性包含以下四種：
typedef NS_ENUM(NSInteger, UIScrollViewContentInsetAdjustmentBehavior) {
UIScrollViewContentInsetAdjustmentAutomatic, // Similar to .scrollableAxes, but for backward compatibility will also adjust the top & bottom contentInset when the scroll view is owned by a view controller with automaticallyAdjustsScrollViewInsets = YES inside a navigation controller, regardless of whether the scroll view is scrollable
UIScrollViewContentInsetAdjustmentScrollableAxes, // Edges for scrollable axes are adjusted (i.e., contentSize.width/height > frame.size.width/height or alwaysBounceHorizontal/Vertical = YES)
UIScrollViewContentInsetAdjustmentNever, // contentInset is not adjusted
UIScrollViewContentInsetAdjustmentAlways, // contentInset is always adjusted by the scroll view's safeAreaInsets
} API_AVAILABLE(ios(11.0),tvos(11.0));
UIScrollViewContentInsetAdjustmentAutomatic 類似于UIScrollViewContentInsetAdjustmentScrollableAxes罕容，scrollView會自動計算和適應頂部和底部的內邊距，并且在scrollView不可滾動時稿饰，也會設置內邊距
UIScrollViewContentInsetAdjustmentScrollableAxes 自動計算內邊距
.UIScrollViewContentInsetAdjustmentNever 不計算內邊距
UIScrollViewContentInsetAdjustmentAlways 根據safeAreaInsets計算內邊距
