iOS UIAlertView弹框

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    
    
    UIButton *btn1=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    [btn1 setTitle:@"Alert" forState:UIControlStateNormal];
    btn1.frame=CGRectMake(10, 100, 100, 40);
    [btn1 addTarget:self action:@selector(AlertViewShow) forControlEvents:UIControlEventTouchUpInside];
    [self.window addSubview:btn1];
    
    
    UIButton *btn2=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    [btn2 setTitle:@"ActionSheet" forState:UIControlStateNormal];
    btn2.frame=CGRectMake(210, 100, 100, 40);
    [btn2 addTarget:self action:@selector(ActionSheetShow) forControlEvents:UIControlEventTouchUpInside];
    [self.window addSubview:btn2];
    
    
    
    return YES;
}

-(void)AlertViewShow
{
    UIAlertView *pAlert=[[UIAlertView alloc]initWithTitle:@"警告" message:@"this is alertView" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:@"sure", nil];
    [pAlert show];
    [pAlert release];
}

-(void)ActionSheetShow
{
    UIActionSheet *pSheet=[[UIActionSheet alloc]initWithTitle:@"ActionView" delegate:self cancelButtonTitle:@"cancel" destructiveButtonTitle:@"确定" otherButtonTitles:@"第一页",@"第二页", nil];
    
    [pSheet showInView:self.window];
    
    [pSheet release];
}