iPhone开发——ActionSheet与AlertView

Home / iOS MrLee 2015-6-15 2920

1、创建一个Single View Application工程,命名为:ActionSheetDemo,如下图


2、在ViewController.xib上放置一个Button,Title为“删除”
修改ViewController.h,添加操作:
-(IBAction)delete:(id)sender;

将Button“删除”的Touch Up Inside与操作delete关联起来(操作方法上一篇已讲过)
3、修改Controller ViewController,让其实现协议UIActionSheetDelegate:
//修改,实现UIActionSheetDelegate协议 @interface ViewController : UIViewController

4、修改ViewController.m
实现操作delete,如下
//执行删除操作
-(IBAction)delete:(id)sender{
    UIActionSheet *actionSheet = [[UIActionSheet alloc]
                                  initWithTitle:@"确定要删除该服务器?" 
                                  delegate:self //actionSheet的代理,按钮被按下时收到通知,然后回调协议中的相关方法
                                  cancelButtonTitle:@"取消"
                                  destructiveButtonTitle:@"确定"
                                  otherButtonTitles:nil];
    //展示actionSheet
    [actionSheet showInView:self.view];
}

ViewController作为ActionSheet的代理,需要实现协议中定义的方法,有2中实现方法
方法一:实现didDismissWithButtonIndex,在ActionSheet消失后做提示处理
//方法1
-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{
    NSLog(@"didDismissWithButtonIndex");
    UIAlertView *alert = nil;
    if(buttonIndex == [actionSheet destructiveButtonIndex]){//确定
        //NSLog(@"确定");
        alert = [[UIAlertView alloc]
                 initWithTitle:@"结果" 
                 message:@"删除完毕" 
                 delegate:self 
                 cancelButtonTitle:@"确定" 
                 otherButtonTitles:nil];
        [alert show];
    }else if(buttonIndex == [actionSheet cancelButtonIndex]){//取消
        NSLog(@"取消");
    }
}

方法二,实现clickedButtonAtIndex,在ActionSheet上的按钮被点击时做处理
//方法2
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
    NSLog(@"clickedButtonAtIndex");
    UIAlertView *alert = nil;
    if(buttonIndex == [actionSheet destructiveButtonIndex]){//确定
        //NSLog(@"确定");
        //执行删除操作
        [self doDelete];
        alert = [[UIAlertView alloc]
                 initWithTitle:@"结果" 
                 message:@"删除完毕" 
                 delegate:self 
                 cancelButtonTitle:@"确定" 
                 otherButtonTitles:nil];
        [alert show];
    }else if(buttonIndex == [actionSheet cancelButtonIndex]){//取消
        NSLog(@"取消");
    }
}

两种方法都是通过buttonIndex判断当前点击的按钮,做不同处理
演示方法,doDelete没有实现实际操作,如下
-(void)doDelete{     NSLog(@"执行删除操作"); 

5、编译、运行,效果如下:

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