UIButton

UIButton *aButton = [UIButtonbuttonWithType:UIButtonTypeSystem];

//給按鈕設定frame

    aButton.frame =CGRectMake(0,0, 200,80);

//為按鈕設定標題－常用的是Normal和Highlighted －標題和圖片二選一

    aButton.center =self.window.center;

    [aButton setTitle:@"登入按鈕"forState:UIControlStateNormal];

    [aButton setTitle:@"鬆開結束"forState

//為按鈕設定圖片

//    [aButton setImage:[UIImage imageNamed:@"logo64X64"] forState:UIControlStateNormal];

//Render渲染－ imageWithRenderingMode:  設定圖片的渲染模式選擇UIImageRenderingModeAlwaysOriginal －原始模式－以原始的圖片來顯示

    [aButton setImage:[[UIImageimageNamed:@"logo64X64"

//為按鈕物件繫結對應事件型別(如下:UIControlEventTouchUpInside)的物件以及響應方法

//為按鈕新增事件  UIButton是直接繼承自UIControl

//為物件新增行為（物件和方法隸屬於同一個類, target一般都是self）

//按鈕的兩種事件型別－ 1.UIControlEventTouchUpInside  2.UIControlEventTouchDown

//按鈕的響應引數如果有引數，則引數為當前被點選的引數物件

    [aButton addTarget:selfaction:@selector(handleButtonAction:)forControlEvents:UIControlEventTouchDown];

    [NSTimerscheduledTimerWithTimeInterval:0.5target:selfselector:@selector(handleButtonAction:)userInfo:nilrepeats:YES];

- (void)handleButtonAction:(UIButton *)sender {

self.window.backgroundColor = [UIColorcolorWithRed:arc4random() %256 / 255.0green:arc4random() %256 /255.0blue:arc4random() %256 /255.0alpha:1];

//建立一個警告檢視

UIAlertView *aAlertView = [[UIAlertViewalloc] initWithTitle:@"溫馨提示"message:@"嘿，你該小心了，嘿嘿嘿"delegate:nilcancelButtonTitle:@"殘忍的拒絕"otherButtonTitles:@"確定",nil];

    [aAlertView show];  //警告不是新增在某個父檢視上，而是放在最上面

    [aAlertView release];

}