UIButton头文件常见属性
1、属性
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contentEdgeInsets: default is UIEdgeInsetsZero.设置内容四边距,默认边距为0
@property(nonatomic) UIEdgeInsets contentEdgeInsets
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titleEdgeInsets: default is UIEdgeInsetsZero,文字内边距。默认边距为0.
@property(nonatomic) UIEdgeInsets titleEdgeInsets;
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reversesTitleShadowWhenHighlighted: default is NO. if YES, shadow reverses to shift between engrave and emboss appearance。默认状态是 NO，按钮高亮时，阴影出现在相反位置。
@property(nonatomic) BOOL reversesTitleShadowWhenHighlighted;
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imageEdgeInsets: default is UIEdgeInsetsZero。图片内边距，默认边距为0；
@property(nonatomic) UIEdgeInsets imageEdgeInsets;
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adjustsImageWhenHighlighted: default is YES. if YES, image is drawn darker when highlighted(pressed),当按钮高亮时是否调整图片。默认是 YES
@property(nonatomic) BOOL adjustsImageWhenHighlighted;
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adjustsImageWhenDisabled:default is YES. if YES, image is drawn lighter when disabled.默认是 yes,如果是 YES，图形绘制较轻时禁用
@property(nonatomic) BOOL adjustsImageWhenDisabled;
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showsTouchWhenHighlighted:default is NO. if YES, show a simple feedback (currently a glow) while highlighted。默认是 NO，如果是 YES，在高亮期间显示一个简单的反馈（当前发光）.如果没有高亮状态，不做任何反馈。
@property(nonatomic) BOOL showsTouchWhenHighlighted;
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tintColor: The tintColor is inherited through the superview hierarchy. See UIView for more information.
这个属性是从 UIView 继承过来的，更多解释信息见 UIView.该属性不应用于UIButtonTypeCustom.，如果Custom 类型的按钮需要使用该属性，应该重写该属性的 set方法。
@property(null_resettable, nonatomic,strong) UIColor *tintColor
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buttonType:按钮样式属性，取值枚举类型
@property(nonatomic,readonly) UIButtonType buttonType;
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currentTitle:normal/highlighted/selected/disabled. can return nil。获取当前的文本。
@property(nullable, nonatomic,readonly,strong) NSString *currentTitle;
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currentTitleColor:normal/highlighted/selected/disabled. always returns non-nil. default is white(1,1)。当前文本颜色，默认白色。
@property(nonatomic,readonly,strong) UIColor *currentTitleColor;
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currentTitleShadowColor:normal/highlighted/selected/disabled.当前状态下的文本阴影颜色
@property(nullable, nonatomic,readonly,strong) UIColor *currentTitleShadowColor;
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currentImage:normal/highlighted/selected/disabled. can return nil。当前状态下的图片。
@property(nullable, nonatomic,readonly,strong) UIImage *currentImage;
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currentBackgroundImage:normal/highlighted/selected/disabled. can return nil。当前状态下的背景图片
@property(nullable, nonatomic,readonly,strong) UIImage *currentBackgroundImage;
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currentAttributedTitle:normal/highlighted/selected/disabled. can return nil。当前状态下的文本属性。
@property(nullable, nonatomic,readonly,strong) NSAttributedString *currentAttributedTitle；
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titleLabel:文本标签属性
@property(nullable, nonatomic,readonly,strong) UILabel *titleLabel；
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imageView:图片属性
@property(nullable, nonatomic,readonly,strong) UIImageView *imageView；
2、方法
由于按钮是有状态的，比如：未点击状态，高亮状态，选中状态，不可用状态等。所以按钮所提供的方法当中很多是根据按钮状态来设置的。
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buttonWithType::类方法，创建按钮对象时，直接指定按钮类型。取值为枚举。
+ (instancetype)buttonWithType:(UIButtonType)buttonType;
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setTitle:forState::default is nil. title is assumed to be single line。根据按钮状态设置文字。
- (void)setTitle:(nullable NSString *)title forState:(UIControlState)state;
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setTitleColor:forState::default if nil. use opaque white。根据按钮状态设置文字颜色，默认白色。
- (void)setTitleColor:(nullable UIColor *)color forState:(UIControlState)state;
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setTitleShadowColor: forState:: default is nil. use 50% black。 设置文字阴影颜色，默认半透明黑色
- (void)setTitleShadowColor:(nullable UIColor *)color forState:(UIControlState)state ;
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setImage: forState:: default is nil. should be same size if different for different states。根据按钮状态设置图片。
- (void)setImage:(nullable UIImage *)image forState:(UIControlState)state;
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setBackgroundImage: forState:: 根据按钮状态设置背景图片。
- (void)setBackgroundImage:(nullable UIImage *)image forState:(UIControlState)state ;
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setAttributedTitle: forState:: default is nil. title is assumed to be single line.根据按钮状态设置文本属性内容（包括文字大小，颜色等）。假设文字是单行的。
- (void)setAttributedTitle:(nullable NSAttributedString *)title forState:(UIControlState)state;
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titleForState: forState::these getters only take a single state value。根据按钮状态获取文本
- (nullable NSString *)titleForState:(UIControlState)state;
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titleColorForState: forState:: 根据按钮状态获取文本颜色
- (nullable UIColor *)titleColorForState:(UIControlState)state;
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titleShadowColorForState: forState:: 根据按钮状态获取文本阴影颜色
- (nullable UIColor *)titleShadowColorForState:(UIControlState)state;
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imageForState: forState:: 根据按钮状态获取图片。
- (nullable UIImage *)imageForState:(UIControlState)state;
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backgroundImageForState: forState:: 根据按钮状态获取背景图片。
- (nullable UIImage *)backgroundImageForState:(UIControlState)state;
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attributedTitleForState: forState:: 根据按钮状态获取文本属性。
- (nullable NSAttributedString *)attributedTitleForState:(UIControlState)state;
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backgroundRectForBounds:: 自定义按钮时，可以更改背景图片在按钮当中的位置。
- (CGRect)backgroundRectForBounds:(CGRect)bounds;
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contentRectForBounds:: 自定义按钮时，可以更改整个内容在按钮当中的位置。
- (CGRect)contentRectForBounds:(CGRect)bounds;
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titleRectForContentRect:: 自定义按钮时，可以更改Label在按钮当中的位置。
- (CGRect)titleRectForContentRect:(CGRect)contentRect;
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imageRectForContentRect:: 自定义按钮时，可以更改图片在按钮当中的位置。
- (CGRect)imageRectForContentRect:(CGRect)contentRect;