小兔网

说明
分类：计算机

按钮使用

按钮用于处理用户操作。它截取触摸事件，并将消息发送到目标对象。

圆角矩形按钮

button

在 xib 中的按钮属性

您可以在Utility area（实用区域，窗口的右侧）的属性检查器的更改  xib 按钮属性。

buttonAttribute

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：

我们将命名为"Button_Default.png"和"Button_Highlighted.png"的个图像添加到我们的项目，可以通过将图像拖到列出了我们的项目文件的导航区域来完成。

在 ViewController.m 中更新 viewDidLoad，如下所示

(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

现在当我们运行应用程序时我们就会得到下面的输出：

buttonOutput