IOS UIButton解读

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typedef NS_ENUM(NSInteger, UIButtonType) {

    //用户自定义，无风格

    UIButtonTypeCustom = 0,  

    //系统默认风格                       

    UIButtonTypeSystem NS_ENUM_AVAILABLE_IOS(7_0), 

    //一下这三种创建出来的按钮一样，一个蓝色的圆圈，中间有个叹号

    UIButtonTypeDetailDisclosure,

    UIButtonTypeInfoLight,

    UIButtonTypeInfoDark,

    //创建+号按钮

    UIButtonTypeContactAdd,

    //废弃

    UIButtonTypeRoundedRect = UIButtonTypeSystem,

};

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@property(nonatomic) UIEdgeInsets contentEdgeInsets UI_APPEARANCE_SELECTOR;

//这个属性设置button里内容的偏移量，包括title和image，可以用如下方法设置

btn.contentEdgeInsets=UIEdgeInsetsMake(20, 20, 0, 0);

@property(nonatomic) UIEdgeInsets titleEdgeInsets;

//这个属性设置标题的偏移量         

@property(nonatomic) BOOL reversesTitleShadowWhenHighlighted;

//按钮高亮时，是否改变阴影效果

@property(nonatomic) UIEdgeInsets imageEdgeInsets;

//图片的偏移量              

@property(nonatomic)BOOL  adjustsImageWhenHighlighted;

//设置图片的绘制是否高亮时变暗   

@property(nonatomic)BOOL  adjustsImageWhenDisabled;

//设置图片是否轻绘制当按钮禁用时

@property(nonatomic)BOOL showsTouchWhenHighlighted;

//设置是否显示手指印在按钮高亮的时候

@property(nonatomic,retain)   UIColor     *tintColor NS_AVAILABLE_IOS(5_0); 

//这个属性会作用于标题和图片，但是如果你是自定义风格的按钮，这个属性将不起任何作用，它只作用于系统的

@property(nonatomic,readonly) UIButtonType buttonType;

//设置button的风格

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- (void)setTitle:(NSString *)title forState:(UIControlState)state;

//设置标题和显示当前标题的按钮状态 

- (void)setTitleColor:(UIColor *)color forState:(UIControlState)state;

//设置标题颜色和显示当前颜色的按钮状态 

- (void)setTitleShadowColor:(UIColor *)color forState:(UIControlState)state; 

//设置标题阴影颜色及显示时的状态

- (void)setImage:(UIImage *)image forState:(UIControlState)state; 

//设置按钮图片和显示当前图片时的状态

- (void)setBackgroundImage:(UIImage *)image forState:(UIControlState)state;

//设置按钮背景图片和显示图片时的状态

- (void)setAttributedTitle:(NSAttributedString *)title forState:(UIControlState)state NS_AVAILABLE_IOS(6_0);

//通过AttributeString创建标题

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- (NSString *)titleForState:(UIControlState)state;       

- (UIColor *)titleColorForState:(UIControlState)state;

- (UIColor *)titleShadowColorForState:(UIControlState)state;

- (UIImage *)imageForState:(UIControlState)state;

- (UIImage *)backgroundImageForState:(UIControlState)state;

- (NSAttributedString *)attributedTitleForState:(UIControlState)state NS_AVAILABLE_IOS(6_0);

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@property(nonatomic,readonly,retain) NSString *currentTitle;        

@property(nonatomic,readonly,retain) UIColor  *currentTitleColor;    

@property(nonatomic,readonly,retain) UIColor  *currentTitleShadowColor; 

@property(nonatomic,readonly,retain) UIImage  *currentImage; 

@property(nonatomic,readonly,retain) UIImage  *currentBackgroundImage; 

@property(nonatomic,readonly,retain) NSAttributedString *currentAttributedTitle NS_AVAILABLE_IOS(6_0); 

//这两个参数需要注意，虽然他们是只读属性不能重新设置，但是我们可以设置label和imageView的相关属性

@property(nonatomic,readonly,retain) UILabel     *titleLabel NS_AVAILABLE_IOS(3_0);

@property(nonatomic,readonly,retain) UIImageView *imageView  NS_AVAILABLE_IOS(3_0);

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- (CGRect)backgroundRectForBounds:(CGRect)bounds;

//返回背景大小

- (CGRect)contentRectForBounds:(CGRect)bounds;

//返回视图大小，包括标题和图片

- (CGRect)titleRectForContentRect:(CGRect)contentRect;

//返回标题大小

- (CGRect)imageRectForContentRect:(CGRect)contentRect;

//返回图片大小