UIActionSheet学习

UIActionSheet是在iOS弹出的选择按钮项，可以添加多项，并为每项添加点击事件。

要遵循UIActionSheetDelegate协议；
需#import<UIKit/UIKit.h>

需注意：
Important:

UIActionSheet

is
deprecated in iOS 8. (Note that

UIActionSheetDelegate

is
also deprecated.) To create and manage action sheets in iOS 8 and later, instead use

UIAlertController

with
a

preferredStyle

of

UIAlertControllerStyleActionSheet

.

如上所示，在IOS8.0及以后 版本中不再支持UIActionSheet，以后的研究下用UIAlertController实现的方法。

重要的属性及方法：

- (instancetype)initWithTitle:(NSString *)title//标题

delegate:(id<UIActionSheetDelegate>)delegate//委托对象，需满足UIActionSheetDelegate协议，可设为nil
cancelButtonTitle:(NSString *)cancelButtonTitle//取消标题
destructiveButtonTitle:(NSString *)destructiveButtonTitle//‘确认’标题
otherButtonTitles:(NSString *)otherButtonTitles//其他按钮标题，可以是一组
, …
//构造方法

@property(nonatomic, copy) NSString *title
//标题；
@property(nonatomic) UIActionSheetStyle actionSheetStyle
//显示风格，可选项如下

UIActionSheetStyleAutomatic=-1

UIActionSheetStyleDefault=UIBarStyleDefault
UIActionSheetStyleBlackTranslucent=UIBarStyleBlackTranslucent
UIActionSheetStyleBlackOpaque=UIBarStyleBlackOpaque

- (NSInteger)addButtonWithTitle:(NSString *)title
//增加一个按钮
@property(nonatomic, readonly) NSInteger numberOfButtons//按钮总数，意义不大
@property(nonatomic) NSInteger cancelButtonIndex//取消按钮的序号，可用来确定当按下是不是取消按钮
@property(nonatomic) NSInteger destructiveButtonIndex//‘确认’按钮序号，可用来确定当按下是不是‘确认’按钮

- (void)showInView:(UIView *)view
// view The view from which the action sheet originates.

常用委托方法：

- (void)actionSheet:(UIActionSheet *)actionSheet

didDismissWithButtonIndex:(NSInteger)buttonIndex

Parameters

actionSheet	The action sheet that was dismissed.
buttonIndex	The index of the button that was clicked. The button indices start at 0. If this is the cancel button index, the action sheet is canceling. If -1, the cancel button index is not set.