UIButton的类是一个UIControl子类，它实现了在触摸屏上的按钮。触摸一个按钮拦截事件和动作消息发送到目标对象时，它的挖掘。设定的目标和行动方法都继承自UIControl。这个类提供了方法来设置标题，图像，按钮等外观属性。通过使用set方法，你可以指定一个不同的外观为每个按钮状态。
UIButton的定义：
UIButton *button=[UIButton buttonWithType:(UIButtonType)];
其中UIButtonType的定义如下：
typedef NS_ENUM(NSInteger, UIButtonType) {
UIButtonTypeCustom = 0, // 无类型（自定义类型）
UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0), // 标准类型
UIButtonTypeDetailDisclosure, //蓝色小箭头按钮
UIButtonTypeInfoLight, //亮色感叹号
UIButtonTypeInfoDark, //暗色感叹号
UIButtonTypeContactAdd, //十字加号
UIButtonTypeRoundedRect = UIButtonTypeSystem, // 圆角矩形
};
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button的属性：
- (void)setTitle:(nullable NSString *)title forState:(UIControlState)state; // 设置标题，即button上显示的文字 - (void)setTitleColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // 设置标题的颜色 - (void)setTitleShadowColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // 设置标题阴影颜色 - (void)setImage:(nullable UIImage *)image forState:(UIControlState)state; // 设置图片 - (void)setBackgroundImage:(nullable UIImage *)image forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // 设置背景图片 - (void)setAttributedTitle:(nullable NSAttributedString *)title forState:(UIControlState)state NS_AVAILABLE_IOS(6_0); // 设置属性名称 |
其中forState这个参数的作用是定义按钮的文字或图片在何种状态下才会显现
以下是forState的定义：
typedef NS_OPTIONS(NSUInteger, UIControlState) {
UIControlStateNormal = 0, // 正常状态显示
UIControlStateHighlighted = 1 << 0, // 高亮状态显示
UIControlStateDisabled = 1 << 1, // 禁用状态显示
UIControlStateSelected = 1 << 2, // 选中状态显示
UIControlStateFocused NS_ENUM_AVAILABLE_IOS(9_0) = 1 << 3, // Applicable only when the screen supports focus
UIControlStateApplication = 0x00FF0000, // additional flags available for application use
UIControlStateReserved = 0xFF000000 // flags reserved for internal framework use
};
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以下属性是设置forState中的各种状态是否启用：
@property(nonatomic) BOOL reversesTitleShadowWhenHighlighted; // default is NO. if YES, shadow reverses to shift between engrave and emboss appearance @property(nonatomic) BOOL adjustsImageWhenHighlighted; // default is YES. if YES, image is drawn darker when highlighted(pressed) @property(nonatomic) BOOL adjustsImageWhenDisabled; // default is YES. if YES, image is drawn lighter when disabled @property(nonatomic) BOOL showsTouchWhenHighlighted __TVOS_PROHIBITED; // default is NO. if YES, show a simple feedback |
给button添加事件：
[button1 addTarget:self action:@selector(callback:) forControlEvents:UIControlEventTouchUpInside];
- (IBAction)callback:(id)sender;{
...
}
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以下是button的事件：
typedef NS_OPTIONS(NSUInteger, UIControlEvents) {
UIControlEventTouchDown = 1 << 0, // on all touch downs
UIControlEventTouchDownRepeat = 1 << 1, // on multiple touchdowns (tap count > 1)
UIControlEventTouchDragInside = 1 << 2,
UIControlEventTouchDragOutside = 1 << 3,
UIControlEventTouchDragEnter = 1 << 4,
UIControlEventTouchDragExit = 1 << 5,
UIControlEventTouchUpInside = 1 << 6,
UIControlEventTouchUpOutside = 1 << 7,
UIControlEventTouchCancel = 1 << 8,
UIControlEventValueChanged = 1 << 12, // sliders, etc.
UIControlEventPrimaryActionTriggered NS_ENUM_AVAILABLE_IOS(9_0) = 1 << 13, // semantic action: for buttons, etc.
UIControlEventEditingDidBegin = 1 << 16, // UITextField
UIControlEventEditingChanged = 1 << 17,
UIControlEventEditingDidEnd = 1 << 18,
UIControlEventEditingDidEndOnExit = 1 << 19, // 'return key' ending editing
UIControlEventAllTouchEvents = 0x00000FFF, // for touch events
UIControlEventAllEditingEvents = 0x000F0000, // for UITextField
UIControlEventApplicationReserved = 0x0F000000, // range available for application use
UIControlEventSystemReserved = 0xF0000000, // range reserved for internal framework use
UIControlEventAllEvents = 0xFFFFFFFF
};
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显示button：
[self.view addSubview: button] |
以上就是UIButton的内容了