如何扩大按钮点击范围 iOS

1.创建一个UIButton的分类 

#import "UIButton+TJHitRect.h"

2.引入头文件

#import <objc/runtime.h>

3.给分类加属性

/**
 自定义响应边界 UIEdgeInsetsMake(-3, -4, -5, -6). 表示扩大
 例如： self.btn.hitEdgeInsets = UIEdgeInsetsMake(-3, -4, -5, -6);
 */
@property(nonatomic, assign) UIEdgeInsets hitEdgeInsets;

关联对象

static const char * kHitEdgeInsets = "hitEdgeInsets";

重写set方法

#pragma mark - set Method
-(void)setHitEdgeInsets:(UIEdgeInsets)hitEdgeInsets{
    NSValue *value = [NSValue value:&hitEdgeInsets withObjCType:@encode(UIEdgeInsets)];
    objc_setAssociatedObject(self,kHitEdgeInsets, value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

重写get方法

#pragma mark - get Method
-(UIEdgeInsets)hitEdgeInsets{
    NSValue *value = objc_getAssociatedObject(self, kHitEdgeInsets);
    UIEdgeInsets edgeInsets;
    [value getValue:&edgeInsets];
    return value ? edgeInsets:UIEdgeInsetsZero;
}

4.重写pointInside方法，如果button边界值无变化、不可点击、隐藏或者透明，说明没扩大按钮点击区域，继续走之前的方法。如果触摸点在UIEdgeInsets设置边缘边距后的范围内就说明点击了按钮。

#pragma mark - override super method
-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{
    //如果 button 边界值无变化  失效 隐藏 或者透明 直接返回
    if(UIEdgeInsetsEqualToEdgeInsets(self.hitEdgeInsets, UIEdgeInsetsZero) || !self.enabled || self.hidden || self.alpha == 0 ) {
        return [super pointInside:point withEvent:event];
    }else{
        CGRect relativeFrame = self.bounds;
        CGRect hitFrame = UIEdgeInsetsInsetRect(relativeFrame, self.hitEdgeInsets);
        return CGRectContainsPoint(hitFrame, point);
    }
}

5.调用方式

self.closeBtn.hitEdgeInsets=UIEdgeInsetsMake(-10, -10, -10, -10);