(轉)UIALertView的基本用法與UIAlertViewDelegate對對話框的事件處理方法

2019-11-14 19:22:23

字體：大中小

來源：轉載

供稿：網友

首先，視圖控制器必須得實現協議UIAlertViewDelegate中的方法，并指定delegate為self，才能使彈出的Alert窗口響應點擊事件。具體代碼如下：

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

ViewController.m中的詳細代碼：

- (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];    //設置標題與信息，通常在使用frame初始化AlertView時使用    alert.title = @"AlertViewTitle";    alert.message = @"AlertViewMessage";        //這個屬性繼承自UIView，當一個視圖中有多個AlertView時，可以用這個屬性來區分    alert.tag = 0;    //只讀屬性，看AlertView是否可見    NSLog(@"%d",alert.visible);    //通過給定標題添加按鈕    [alert addButtonWithTitle:@"addButton"];    //按鈕總數    NSLog(@"number Of Buttons :%d",alert.numberOfButtons);    //獲取指定索引的按鈕標題    NSLog(@"buttonTitleAtIndex1:%@",[alert buttonTitleAtIndex:1]);    NSLog(@"buttonTitleAtIndex2:%@",[alert buttonTitleAtIndex:2]);    //獲取取消按鈕的索引    NSLog(@"cancelButtonIndex:%d",alert.cancelButtonIndex);    //獲取第一個其他按鈕的索引    NSLog(@"firstOtherButtonIndex:%d",alert.firstOtherButtonIndex);    //顯示AlertView    [alert show];    [alert release];}#PRagma marks -- UIAlertViewDelegate --//根據被點擊按鈕的索引處理點擊事件-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    NSLog(@"clickButtonAtIndex:%d",buttonIndex);}//AlertView已經消失時執行的事件-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{    NSLog(@"didDismissWithButtonIndex");}//ALertView即將消失時的事件-(void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{    NSLog(@"willDismissWithButtonIndex");}//AlertView的取消按鈕的事件-(void)alertViewCancel:(UIAlertView *)alertView{    NSLog(@"alertViewCancel");}//AlertView已經顯示時的事件-(void)didPresentAlertView:(UIAlertView *)alertView{    NSLog(@"didPresentAlertView");}//AlertView即將顯示時-(void)willPresentAlertView:(UIAlertView *)alertView{    NSLog(@"willPresentAlertView");}- (void)viewDidUnload{    [super viewDidUnload];    // Release any retained subviews of the main view.    // e.g. self.myOutlet = nil;}