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iOS – 按钮

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。

圆形矩形按钮

iOS 教程

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。
iOS 教程

按钮类型

  • UIButtonType自定义
  • UIButtonTypeRoundedRect
  • UIButtonTypeDetailDisclosure
  • UIButtonTypeInfoLight
  • UIButtonTypeInfoDark
  • UIButtonTypeContactAdd

重要属性

  • 图像视图
  • 标题标签

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

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];
}
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
}

输出

当我们运行应用程序时,我们将获得以下输出 –
iOS 教程

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