按钮的使用

IOS中 Button(按钮)是用来处理用户的操作。它截取的触摸事件，并发送消息到目标对象。

圆矩形按钮

XIB中的按钮属性

实用程序区（右侧窗口），在属性检查器中，可以在 xib 改变按钮的属性。

 

按钮类型

• UIButtonTypeCustom

• UIButtonTypeRoundedRect

• UIButtonTypeDetailDisclosure

• UIButtonTypeInfoLight

• UIButtonTypeInfoDark

• UIButtonTypeContactAdd

重要的属性

• 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

 

添加一个自定义的方法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:

我们必须添加两个命名为“Button_Default.png” 和 “Button_Highlighted.png”图像，可以通过拖动图片到导航区域。

 

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
}

输出

现在，当我们运行程序时，我们会得到下面的输出