通过block对button的点击事件封装
具体的实现过程
typedefvoid(^tapActionBlock)(UIButton *button);
@interfaceUIButton (Block)
@property(nonatomic,copy)tapActionBlock actionBlock;
//第一种封装
/**
通过block对button的点击事件封装
@param frame frame
@param title 按钮文字
@param font 按钮文字的大小
@param titleColor 按钮文字的颜色
@param backgroundColor 按钮的背景颜色
@param btnImageName 按钮的图片
@param actionBlock 点击事件回调block
@return button
*/
+ (UIButton *)createBtnFrame:(CGRect)frame title:(NSString *)title titleFont:(CGFloat)font titleColor:(UIColor *)titleColor backgroundColor:(UIColor *)backgroundColor btnImageName:(NSString *)btnImageName action:(tapActionBlock)actionBlock;
在.m文件中实现其方法
staticNSString *keyOfUseCategoryMethod;//用分类方法创建的button，关联对象的key
staticNSString *keyOfBlock;
+(UIButton *)createBtnFrame:(CGRect)frame title:(NSString *)title titleFont:(CGFloat)font titleColor:(UIColor *)titleColor backgroundColor:(UIColor *)backgroundColor btnImageName:(NSString *)btnImageName action:(tapActionBlock)actionBlock{
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame= frame;
[button setTitle:title forState:UIControlStateNormal];
button.titleLabel.font= [UIFont systemFontOfSize:font];
[button setTitleColor:titleColor forState:UIControlStateNormal];
button.backgroundColor= backgroundColor;
[button setImage:[UIImage imageNamed:btnImageName] forState:UIControlStateNormal];
[button addTarget:button action:@selector(tapAction:) forControlEvents:UIControlEventTouchUpInside];
/**
*用runtime中的函数通过key关联对象
*
*objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)
*id object 表示关联者，是一个对象，变量名理所当然也是object
*const void *key 获取被关联者的索引key
*id value 被关联者，这里是一个block
*objc_AssociationPolicy policy 关联时采用的协议，有assign，retain，copy等协议，一般使用OBJC_ASSOCIATION_RETAIN_NONATOMIC
*/
objc_setAssociatedObject (button , &keyOfUseCategoryMethod, actionBlock,OBJC_ASSOCIATION_COPY_NONATOMIC);
returnbutton;
}
按钮的点击事件
- (void)tapAction:(UIButton*)sender{
/**
* 通过key获取被关联对象
*objc_getAssociatedObject(id object, const void *key)
*
*/
tapActionBlockblock = (tapActionBlock)objc_getAssociatedObject (sender , &keyOfUseCategoryMethod);
if(block) {
block(sender);
}
}
- (void)setActionBlock:(tapActionBlock)actionBlock{
objc_setAssociatedObject (self, &keyOfBlock, actionBlock,OBJC_ASSOCIATION_COPY_NONATOMIC);
}
- (tapActionBlock)actionBlock{
returnobjc_getAssociatedObject (self, &keyOfBlock);
}
调用方法
UIButton *btn =[UIButtoncreateBtnFrame:CGRectMake(100,200,20,20)title:@"eeee"titleFont:12titleColor:[UIColor yellowColor]backgroundColor:[UIColor blueColor]btnImageName:@"headerDefault"action:^(UIButton *button) {
回调的按钮的点击事件
}];
[self.viewaddSubview:btn];