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[操作系统](转) UIALertView的基本用法与UIAlertViewDelegate对对话框的事件处理方法


首先,视图控制器必须得实现协议UIAlertViewDelegate中的方法,并指定delegate为self,才能使弹出的Alert窗口响应点击事件。具体代码如下:

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UIAlertViewDelegate>@end

ViewController.m中的详细代码:

- (void)viewDidLoad{  [super viewDidLoad];  // Do any additional setup after loading the view from its nib    //初始化AlertView  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"AlertViewTest"                          message:@"message"                         delegate:self                     cancelButtonTitle:@"Cancel"                     otherButtonTitles:@"OtherBtn",nil];  //设置标题与信息,通常在使用frame初始化AlertView时使用  alert.title = @"AlertViewTitle";  alert.message = @"AlertViewMessage";    //这个属性继承自UIView,当一个视图中有多个AlertView时,可以用这个属性来区分  alert.tag = 0;  //只读属性,看AlertView是否可见  NSLog(@"%d",alert.visible);  //通过给定标题添加按钮  [alert addButtonWithTitle:@"addButton"];  //按钮总数  NSLog(@"number Of Buttons :%d",alert.numberOfButtons);  //获取指定索引的按钮标题  NSLog(@"buttonTitleAtIndex1:%@",[alert buttonTitleAtIndex:1]);  NSLog(@"buttonTitleAtIndex2:%@",[alert buttonTitleAtIndex:2]);  //获取取消按钮的索引  NSLog(@"cancelButtonIndex:%d",alert.cancelButtonIndex);  //获取第一个其他按钮的索引  NSLog(@"firstOtherButtonIndex:%d",alert.firstOtherButtonIndex);  //显示AlertView  [alert show];  [alert release];}#pragma marks -- UIAlertViewDelegate --//根据被点击按钮的索引处理点击事件-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{  NSLog(@"clickButtonAtIndex:%d",buttonIndex);}//AlertView已经消失时执行的事件-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{  NSLog(@"didDismissWithButtonIndex");}//ALertView即将消失时的事件-(void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{  NSLog(@"willDismissWithButtonIndex");}//AlertView的取消按钮的事件-(void)alertViewCancel:(UIAlertView *)alertView{  NSLog(@"alertViewCancel");}//AlertView已经显示时的事件-(void)didPresentAlertView:(UIAlertView *)alertView{  NSLog(@"didPresentAlertView");}//AlertView即将显示时-(void)willPresentAlertView:(UIAlertView *)alertView{  NSLog(@"willPresentAlertView");}- (void)viewDidUnload{  [super viewDidUnload];  // Release any retained subviews of the main view.  // e.g. self.myOutlet = nil;}