按鈕使用

按鈕用於處理用戶操作。它截取觸摸事件，並將消息發送到目標對象。

圓角矩形按鈕

在 xib 中的按鈕屬性

您可以在Utility area（實用區域，窗口的右側）的屬性檢查器的更改  xib 按鈕屬性。

按鈕類型

• UIButtonTypeCustom
• UIButtonTypeRoundedRect
• UIButtonTypeDetailDisclosure
• UIButtonTypeInfoLight
• UIButtonTypeInfoDark
• UIButtonTypeContactAdd

重要的屬性

• imageView
• titleLabel

重要的方法

+ (id)buttonWithType:(UIButtonType)buttonType

- (UIImage *)backgroundImageForState:(UIControlState)state

- (UIImage *)imageForState:(UIControlState)state

- (void)setTitle:(NSString *)title forState:(UIControlState)state

- (void)addTarget:(id)target action:(SEL)action forControlEvents: (UIControlEvents) controlEvents

-(void)addDifferentTypesOfButton
{
    // A rounded Rect button created by using class method
    UIButton *roundRectButton = [UIButton buttonWithType:
    UIButtonTypeRoundedRect];
    [roundRectButton setFrame:CGRectMake(60, 50, 200, 40)];
    // sets title for the button
    [roundRectButton setTitle:@"Rounded Rect Button" forState:
    UIControlStateNormal];
    [self.view addSubview:roundRectButton];

    UIButton *customButton = [UIButton buttonWithType: UIButtonTypeCustom];
    [customButton setBackgroundColor: [UIColor lightGrayColor]];
    [customButton setTitleColor:[UIColor blackColor] forState:
    UIControlStateHighlighted];
    //sets background image for normal state    
    [customButton setBackgroundImage:[UIImage imageNamed:
    @"Button_Default.png"]
    forState:UIControlStateNormal];
    //sets background image for highlighted state
    [customButton setBackgroundImage:[UIImage imageNamed:
    @"Button_Highlighted.png"]
    forState:UIControlStateHighlighted];
    [customButton setFrame:CGRectMake(60, 100, 200, 40)];
    [customButton setTitle:@"Custom Button" forState:UIControlStateNormal];
    [self.view addSubview:customButton];

    UIButton *detailDisclosureButton = [UIButton buttonWithType:
    UIButtonTypeDetailDisclosure];
    [detailDisclosureButton setFrame:CGRectMake(60, 150, 200, 40)];
    [detailDisclosureButton setTitle:@"Detail disclosure" forState:
    UIControlStateNormal];
    [self.view addSubview:detailDisclosureButton];

    UIButton *contactButton = [UIButton buttonWithType:
    UIButtonTypeContactAdd];
    [contactButton setFrame:CGRectMake(60, 200, 200, 40)];
    [self.view addSubview:contactButton];

    UIButton *infoDarkButton = [UIButton buttonWithType:
    UIButtonTypeInfoDark];
    [infoDarkButton setFrame:CGRectMake(60, 250, 200, 40)];
    [self.view addSubview:infoDarkButton];

    UIButton *infoLightButton = [UIButton buttonWithType:
    UIButtonTypeInfoLight];
    [infoLightButton setFrame:CGRectMake(60, 300, 200, 40)];
    [self.view addSubview:infoLightButton];
}

注意：

我們將命名為"Button_Default.png"和"Button_Highlighted.png"的個圖像添加到我們的專案，可以通過將圖像拖到列出了我們的專案檔的導航區域來完成。

在 ViewController.m 中更新 viewDidLoad，如下所示

(void)viewDidLoad
{
    [super viewDidLoad];
    //The custom method to create our different types of button is called
    [self addDifferentTypesOfButton];
    //Do any additional setup after loading the view, typically from a nib
}

輸出

現在當我們運行應用程式時我們就會得到下麵的輸出：