按钮用于处理用户操作。它拦截触摸事件并将消息发送到目标对象。
Buttons - 属性
您可以在实用程序区域(窗口的右侧)的属性检查器中的xib中更改按钮属性。
Buttons - 类型
- UIButtonTypeCustom
- UIButtonTypeRoundedRect
- UIButtonTypeDetailDisclosure
- UIButtonTypeInfoLight
- UIButtonTypeInfoDark
- UIButtonTypeContactAdd
Buttons - 重要属性
- imageView
- titleLabel
Buttons - 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
Buttons - 自定义方法
-(void)addDifferentTypesOfButton { //使用类方法创建的圆角矩形按钮 UIButton *roundRectButton = [UIButton buttonWithType: UIButtonTypeRoundedRect]; [roundRectButton setFrame:CGRectMake(60， 50， 200， 40)];//设置按钮的标题 [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];
//设置正常状态的背景图像 [customButton setBackgroundImage:[UIImage imageNamed: @"Button_Default.png"] forState:UIControlStateNormal];
//为突出显示的状态设置背景图像 [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]; }
无涯教程必须在项目中添加两个分别名为" Button_Default.png"和" Button_Highlighted.png"的图像，可以通过将图像拖到列出项目文件的导航器区域中来完成
更新ViewController.m中的viewDidLoad，如下所示:
(void)viewDidLoad {
[super viewDidLoad];
//创建我们不同类型按钮的自定义方法称为
[self addDifferentTypesOfButton];
//Do any additional setup after loading the view, typically from a nib
}
运行应用程序时，将获得以下输出-
