按鈕的使用

IOS中 Button(按鈕)是用來處理用戶的操作。它截取的觸摸事件，並發送消息到目標對象。

圓矩形按鈕

XIB中的按鈕屬性

實用程序區（右側窗口），在屬性檢查器中，可以在 xib 改變按鈕的屬性。

 

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

 

添加一個自定義的方法addDifferentTypesOfButton

-(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:

我們必須添加兩個命名為“Button_Default.png” 和 “Button_Highlighted.png”圖像，可以通過拖動圖片到導航區域。

 

更新在ViewController.m 中的 viewDidLoad 方法如下

(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，當我們運行程序時，我們會得到下麵的輸出