iOS-UI控件之UIButton
---恢复内容开始---
UIButton
- 既可以显示图片，又可以显示文字，还能随时调整内部位置
- 系统自带尺寸
storyboard内部调整UIButton属性
状态
监听按钮点击事件
- 凡是继承自UIControl的控件，都可以通过addTarget:...方法来监听事件 addTarget:(id) action:(SEL) forControlEvents:(UIControlEvents)
//UIControlEvents 的取值
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.
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
};设置button内部文字和图片的方法
- (void)setTitle:(NSString *)title forState:(UIControlState)state;
- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state UI_APPEARANCE_SELECTOR;
- (void)setImage:(UIImage *)image forState:(UIControlState)state;
- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state UI_APPEARANCE_SELECTOR;自定义UIButton
UIButton内部有两个子控件 UILabel和UIImageView
调整控件内部子控件的frame（两种方式）
- 实现
titleRectForContentRect和imageRectForContentRect方法分别返回子控件的 frame
- (CGRect)titleRectForContentRect:(CGRect)contentRect;
- (CGRect)imageRectForContentRect:(CGRect)contentRect;- 在另一方法中设置子控件的frame
/**
* 当前控件的frame发生改变的时候就会调用
* 这个方法专门用来布局子控件，设置子控件的frame
*/
- (void)layoutSubviews;内边距
// 设置按钮内容的内边距（影响到imageView和titleLabel）
@property(nonatomic) UIEdgeInsets contentEdgeInsets;
// 设置titleLabel的内边距（影响到titleLabel）
@property(nonatomic) UIEdgeInsets titleEdgeInsets;
// 设置imageView的内边距（影响到imageView）
@property(nonatomic) UIEdgeInsets imageEdgeInsets;图片拉伸
- UIButton 图片的拉伸，大小改变
- iOS5之前
// 只拉伸中间的1x1区域
//传入左上的距离的区域
- (UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight;- iOS5开始
//传入左上右下不拉伸的区域，默认方式是平铺
- (UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)capInsets;
//resizingMode 拉伸方式的参数
- (UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)capInsets resizingMode:(UIImageResizingMode)resizingMode;- 另一种改变图片拉伸方式
- 在Images.xcassets中选择图片
- 在slicing属性中选择拉伸范围
- 自动计算拉伸范围
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原始发表：2015-06-26 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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