iOS - 按钮

按钮使用

按钮用于处理用户操作。它会截取触摸事件并向目标对象发送消息。

圆角矩形按钮

xib 中的按钮属性

你可以在工具区域（窗口右侧）的属性检查器中更改 xib 中的按钮属性。

按钮类型

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

重要属性

• imageView
• titleLabel

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];
}

注意 -

我们必须向我们的项目添加两张名为“Button_Default.png”和“Button_Highlighted.png”的图片，我们可以将这些图片拖拽到我们的导航器区域，其中列出了我们的项目文件。

如下所示，更新 ViewController.m 中的 viewDidLoad

(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

当我们运行该应用程序时，我们将会获得以下输出 -