UIButton扩大点击范围

我们在项目开发中可能会出现按钮较小，用户不容易点击的情况。

解决方法

新建UIButton分类，重写- (nullable UIView *)hitTest:(CGPoint)point withEvent:(nullable UIEvent *)event;改变按钮的有效点击区域

代码

UIButton+HLClickRange.h

typedef struct HLClickEdgeInsets {
    
    CGFloat top,left,bottom,right;
    
} HLClickEdgeInsets;

UIKIT_STATIC_INLINE HLClickEdgeInsets HLClickEdgeInsetsMake(CGFloat top, CGFloat left, CGFloat bottom, CGFloat right) {
    
    HLClickEdgeInsets clickEdgeInsets = {top, left, bottom, right};
    return clickEdgeInsets;
}

@interface UIButton (HLClickRange)

/**
 改变button的点击范围
 length:范围边缘距离（四个边缘同样距离）
 */
- (void)hlChangeButtonClickLength:(CGFloat)length;

/**
 改变button的点击范围
 edgeInsets:范围边缘距离
 */
- (void)hlChangeButtonClickRange:(HLClickEdgeInsets)edgeInsets;

@end

UIButton+HLClickRange.m

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

static char hlTopKey;
static char hlLeftKey;
static char hlBottomKey;
static char hlRightKey;

@implementation UIButton (HLClickRange)

- (void)hlChangeButtonClickLength:(CGFloat)length{
    
    [self hlChangeButtonClickRange:HLClickEdgeInsetsMake(length, length, length, length)];
}

- (void)hlChangeButtonClickRange:(HLClickEdgeInsets)edgeInsets{
    
    objc_setAssociatedObject(self, &hlTopKey, [NSNumber numberWithFloat:edgeInsets.top], OBJC_ASSOCIATION_COPY_NONATOMIC);
    objc_setAssociatedObject(self, &hlLeftKey, [NSNumber numberWithFloat:edgeInsets.left], OBJC_ASSOCIATION_COPY_NONATOMIC);
    objc_setAssociatedObject(self, &hlBottomKey, [NSNumber numberWithFloat:edgeInsets.bottom], OBJC_ASSOCIATION_COPY_NONATOMIC);
    objc_setAssociatedObject(self, &hlRightKey, [NSNumber numberWithFloat:edgeInsets.right], OBJC_ASSOCIATION_COPY_NONATOMIC);
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{

    CGRect rect = [self enlargedRect];
    if (CGRectEqualToRect(rect, self.bounds))
    {
        return [super hitTest:point withEvent:event];
    }
    return CGRectContainsPoint(rect, point) ? self : nil;
}

- (CGRect)enlargedRect
{
    NSNumber *topEdge = objc_getAssociatedObject(self, &hlTopKey);
    NSNumber *leftEdge = objc_getAssociatedObject(self, &hlLeftKey);
    NSNumber *bottomEdge = objc_getAssociatedObject(self, &hlBottomKey);
    NSNumber *rightEdge = objc_getAssociatedObject(self, &hlRightKey);
   
    if (topEdge && rightEdge && bottomEdge && leftEdge){
        
        return CGRectMake(self.bounds.origin.x - leftEdge.floatValue,
                          self.bounds.origin.y - topEdge.floatValue,
                          self.bounds.size.width + leftEdge.floatValue + rightEdge.floatValue,
                          self.bounds.size.height + topEdge.floatValue + bottomEdge.floatValue);
    }else{
        
        return self.bounds;
    }
}

@end

Demo地址