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 |