ios 代理类总结一下。今后多看看

UITextViewDelegate

UIToolbarDelegate

UITextInputDelegate

UITextFieldDelegate

UIWebViewDelegate

NSLayoutManagerDelegate

//UIActionSheet

//UIActionSheetDelegate 要放弃

//UIAlertView  要放弃

//UIAlertViewDelegate

//优先使用preferred

//UIAlertController

//UIAlertControllerStyleActionSheet

UIApplicationDelegate

UIBarPositioningDelegate

UICollectionViewDelegate

UINavigationBarDelegate

UINavigationControllerDelegate

UIPageViewControllerDataSource

UIPageViewControllerDelegate

UIPickerViewDataSource

UIPickerViewDelegate

UIScrollViewDelegate

UISearchBarDelegate

UITableViewDataSource

UITableViewDelegate