UIButton的類是一個UIControl子類，它實現了在觸摸屏上的按鈕。觸摸一個按鈕攔截事件和動作消息發送到目標對象時，它的挖掘。設定的目標和行動方法都繼承自UIControl。這個類提供了方法來設置標題，圖像，按鈕等外觀屬性。通過使用set方法，你可以指定一個不同的外觀爲每個按鈕狀態。
UIButton的定義：
UIButton *button=[UIButton buttonWithType:(UIButtonType)];
其中UIButtonType的定義如下：
typedef NS_ENUM(NSInteger, UIButtonType) {
UIButtonTypeCustom = 0, // 無類型（自定義類型）
UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0), // 標準類型
UIButtonTypeDetailDisclosure, //藍色小箭頭按鈕
UIButtonTypeInfoLight, //亮色感嘆號
UIButtonTypeInfoDark, //暗色感嘆號
UIButtonTypeContactAdd, //十字加號
UIButtonTypeRoundedRect = UIButtonTypeSystem, // 圓角矩形
}; |
button的屬性：
- (void)setTitle:(nullable NSString *)title forState:(UIControlState)state; // 設置標題，即button上顯示的文字 - (void)setTitleColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // 設置標題的顏色 - (void)setTitleShadowColor:(nullable UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // 設置標題陰影顏色 - (void)setImage:(nullable UIImage *)p_w_picpath forState:(UIControlState)state; // 設置圖片 - (void)setBackgroundImage:(nullable UIImage *)p_w_picpath forState:(UIControlState)state UI_APPEARANCE_SELECTOR; // 設置背景圖片 - (void)setAttributedTitle:(nullable NSAttributedString *)title forState:(UIControlState)state NS_AVAILABLE_IOS(6_0); // 設置屬性名稱 |
其中forState這個參數的作用是定義按鈕的文字或圖片在何種狀態下才會顯現
以下是forState的定義：
typedef NS_OPTIONS(NSUInteger, UIControlState) {
UIControlStateNormal = 0, // 正常狀態顯示
UIControlStateHighlighted = 1 << 0, // 高亮狀態顯示
UIControlStateDisabled = 1 << 1, // 禁用狀態顯示
UIControlStateSelected = 1 << 2, // 選中狀態顯示
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
}; |
以下屬性是設置forState中的各種狀態是否啓用：
@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, p_w_picpath is drawn darker when highlighted(pressed) @property(nonatomic) BOOL adjustsImageWhenDisabled; // default is YES. if YES, p_w_picpath is drawn lighter when disabled @property(nonatomic) BOOL showsTouchWhenHighlighted __TVOS_PROHIBITED; // default is NO. if YES, show a simple feedback |
給button添加事件：
[button1 addTarget:self action:@selector(callback:) forControlEvents:UIControlEventTouchUpInside];
- (IBAction)callback:(id)sender;{
...
} |
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
}; |
顯示button：
[self.view addSubview: button] |
以上就是UIButton的內容了