iOS求生之路(三)（UIAlertView的用法）

<p style="color: rgb(54, 46, 43); font-family: Arial; font-size: 14px; line-height: 26px;">首先，視圖控制器必須得實現協議UIAlertViewDelegate中的方法，並指定delegate爲self，才能使彈出的Alert窗口響應點擊事件。</p><p style="color: rgb(54, 46, 43); font-family: Arial; font-size: 14px; line-height: 26px;">具體代碼如下：</p><p style="color: rgb(54, 46, 43); font-family: Arial; font-size: 14px; line-height: 26px;"></p><p class="p1" style="color: rgb(54, 46, 43); font-family: Arial; font-size: 14px; line-height: 26px;">ViewController.h中的代碼如下：</p>

#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;
}

原文出處：http://blog.csdn.net/enuola/article/details/7900346