没事看着玩~

那天抽风想自己看看链式编程的实现~~_{前有RAC太强大好使,我这纯粹看看思路,就当看着玩}~

UIButton *btn = [[UIButton alloc] init];
    btn.xl_frame(CGRectMake(0, 0, 80, 30)).xl_title(@"测试一把~~");
    [btn addActionBlock:^(UIButton *btn) {
        LOG(@"点击了~~咋地!");
    } forControlEvents:(UIControlEventTouchUpInside)];

1.UIButton+XLBlock.h 文件

#import <UIKit/UIKit.h>
typedef void(^BtnActionBlock)(UIButton *btn);
typedef UIButton *(^XLBtnFrameBlock)(CGRect frame);
typedef UIButton *(^XLBtnTitleBlock)(NSString *title);
@interface UIButton (XLBlock)

@property (nonatomic, copy)XLBtnFrameBlock xl_frame;
@property (nonatomic, copy)XLBtnTitleBlock xl_title;
-(void)addActionBlock:(BtnActionBlock)actionBlock forControlEvents:(UIControlEvents)event;

@end

1.UIButton+XLBlock.m 文件

#import "UIButton+XLBlock.h"
#import <objc/runtime.h>

@implementation UIButton (XLBlock)

#pragma mark -- 点语法实现链式调用(测试学习代码原理)
#pragma mark -- frame的处理:(只是处理 [返回当前对象并携带要处理当前对象参数变量的block] 的get方法)
-(XLBtnFrameBlock)xl_frame{
    XLBtnFrameBlock block = ^(CGRect frame){//get方法里定义block
        self.frame = frame;
        return self;
    };
    return block;
}

-(void)setXl_frame:(XLBtnFrameBlock)xl_frame{
    //空实现
}

#pragma mark -- title的处理
-(XLBtnTitleBlock)xl_title{
    XLBtnTitleBlock block = ^(NSString *title){
        [self setTitle:title forState:UIControlStateNormal];
        return self;
    };
    return block;
}

-(void)setXl_title:(XLBtnTitleBlock)xl_title{
    //空实现
}

-(void)addActionBlock:(BtnActionBlock)actionBlock forControlEvents:(UIControlEvents)event{
    
    __weak typeof(self) weakSelf = self;
    if (actionBlock){
        objc_setAssociatedObject(self, "BtnActionBlock", actionBlock, OBJC_ASSOCIATION_COPY);//KVC增加示例变量
    }
    [self addTarget:weakSelf action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
}

- (void)btnAction:(UIButton *)btn
{
    BtnActionBlock block = objc_getAssociatedObject(self, "BtnActionBlock");//取出实例变量
    if (block) {
        block(btn);
    }
}