在實際開發中，可能會需要給UILabel、UIView等等新增點選事件，目的就是在保留控制元件自身屬性的同時，多一個點選效果，所以這裡寫了一個UIView的category,用於處理這種情況。

1、.h檔案程式碼如下：

#import <UIKit/UIKit.h>

typedef void (^WhenTappedBlock)();

@interface UIView (Tapped) <UIGestureRecognizerDelegate>
/*!
 @method
 @abstract 單擊
 @param block 程式碼塊
 */
- (void)whenTapped:(WhenTappedBlock)block;

@end
 

這裡聲明瞭一個block，用於在新增點選事件時，直接在block回撥裡面處理點選的響應事件。

2、.m檔案主要程式碼如下:

#import "UIView+Tapped.h"
#import <objc/runtime.h>

@implementation UIView (Tapped)

static char kWhenTappedBlockKey;

#pragma mark - Set blocks
- (void)setBlock:(WhenTappedBlock)block forKey:(void *)blockKey {
    self.userInteractionEnabled
 
 = YES;
    objc_setAssociatedObject(self, blockKey, block, OBJC_ASSOCIATION_COPY_NONATOMIC);
}

- (void)runBlockForKey:(void *)blockKey {
    WhenTappedBlock block = objc_getAssociatedObject(self, blockKey);
    if (block) block();
}

#pragma mark - When Tapped
- (void)whenTapped:(WhenTappedBlock)block {
    //新增點選手勢
 

    UITapGestureRecognizer* gesture = [self addTapGestureRecognizerWithTaps:1 touches:1 selector:@selector(viewWasTapped)];
    [self addGestureRecognizer:gesture];
    [self setBlock:block forKey:&kWhenTappedBlockKey];

}

/*手勢點選響應事件*/
- (void)viewWasTapped {
    [self runBlockForKey:&kWhenTappedBlockKey];
}

#pragma mark - addTapGesture
- (UITapGestureRecognizer*)addTapGestureRecognizerWithTaps:(NSUInteger)taps touches:(NSUInteger)touches selector:(SEL)selector {

    UITapGestureRecognizer* tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:selector];
    tapGesture.delegate = self;
    tapGesture.numberOfTapsRequired = taps;
    tapGesture.numberOfTouchesRequired = touches;

    return tapGesture;
}

@end

這裡用到了一個runtime的方法處理block。當然也可以不必像上面那樣，可以通過delegate實現。這裡只是一個思路，記錄一下。

呼叫的時候也是非常方便，在要實現的地方新增#import “UIView+Tapped.h”,然後在初始化控制元件的地方新增如下程式碼即可：

[label whenTapped:^{
//這裡新增點選響應的方法
}];

下面是demo裡的測試效果