iOS - 按钮

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  按钮的使用

  按钮用于处理用户操作。它拦截触摸事件并向目标对象发送消息。
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  圆形矩形按钮

  
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  xib 中的按钮属性

  您可以在实用程序区域（窗口右侧）的属性检查器中更改 xib 中的按钮属性。

  
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  按钮类型

  • UIButtonType自定义
  • UIButtonTypeRoundedRect
  • UIButtonTypeDetailDisclosure
  • UIButtonTypeInfoLight
  • UIButtonTypeInfoDark
  • UIButtonTypeContactAdd
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  重要属性

  • 图像视图
  • 标题标签
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  重要方法

  
  + (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
  

  复制
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  添加自定义方法 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];
  }
  

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  Note −

  我们必须将名为“Button_Default.png”和“Button_Highlighted.png”的两个图像添加到我们的项目中，这可以通过将图像拖动到我们的项目文件所在的导航器区域来完成。

  更新 ViewController.m 中的 viewDidLoad 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
  }
  

  复制
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  输出

  当我们运行应用程序时，我们将获得以下输出 -