平常我們寫button的點選一般都是用addTarget

[_button addTarget:self action:@selector(didTapButton:) forControlEvents:UIControlEventTouchUpInside];

這種寫法還需要單獨去寫點選執行的方法;
以下程式碼是把addTarget寫入分類,用block傳值,這樣當監聽點選時直接在block傳入點選事件即可

UIButton+Block.h

#import <UIKit/UIKit.h>

typedef void(^ButtonBlock)(UIButton* btn);

@interface
 
 UIButton (Block)

- (void)addAction:(ButtonBlock)block;
- (void)addAction:(ButtonBlock)block forControlEvents:(UIControlEvents)controlEvents;

@end

UIButton+Block.m

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

@implementation UIButton (Block)
static char ActionTag;

- (void)addAction:(ButtonBlock)block
{
    objc_setAssociatedObject(self
 
, &ActionTag, block, OBJC_ASSOCIATION_COPY_NONATOMIC);
    [self addTarget:self action:@selector(action:) forControlEvents:UIControlEventTouchUpInside];
}

- (void)addAction:(ButtonBlock)block forControlEvents:(UIControlEvents)controlEvents
{
    objc_setAssociatedObject(self, &ActionTag, block, OBJC_ASSOCIATION_COPY_NONATOMIC);
    [self
 
 addTarget:self action:@selector(action:) forControlEvents:controlEvents];
}

- (void)action:(id)sender
{
    ButtonBlock blockAction = (ButtonBlock)objc_getAssociatedObject(self, &ActionTag);
    if (blockAction)
    {
        blockAction(self);
    }
}

@end

呼叫示例:

 __weak typeof (self)weakSelf = self;
    [footer.button addAction:^(UIButton *btn) {
        WTAddressControlViewController *vc = [[WTAddressControlViewController alloc] initWithViewControllerType:WTAddressControlTypeAdd];
        vc.popBlock = ^(){
            [weakSelf loadData];
        };
        [weakSelf.navigationController pushViewController:vc animated:YES];
    }];

需要注意迴圈引用