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