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iOS UIButton解读

UIButton控件是应用界面中常用的一个控件,用法总结:

一、初始化

UIButton的初始化一般使用其类方法,+ (id)buttonWithType:(UIButtonType)buttonType;

风格的枚举如下:

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,
};

二、属性设置

@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

三、一些set方法

  • (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

注意:按钮图片设置和背景图片的不同在于:

1、设置图片,如果有标题会和标题并列显示

2、设置背景图片会出现在标题下面

3、图片的偏移量可以设置,背景图片不可以。

四、一些get方法,可以得到上述设置的属性

  • (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);

五、一些只读属性

@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);

六、下面这些函数,都会返回一个CGRect 矩形范围

  • (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

关于触发事件,button是继承于UIControl,这里不再叙述。

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