iOS UIButton扩大按钮响应区域的解决方法

在开发中有时会遇见设计图里按钮设计的特别小，这时会用到手动扩大UIButton的响应范围，下面有两个解决办法：

第一种方法：创建一个类目：UIButton+EnlargeTouchArea

.h文件

#import <UIKit/UIKit.h>

@interface UIButton (EnlargeTouchArea)

- (void)setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left;
- (void)setEnlargeEdge:(CGFloat) size;

@end

.m文件

 //
// UIButton+EnlargeTouchArea.m
// HeBeiFM
//
// Created by Apple on 16/4/27.
// Copyright © 2016年 Apple. All rights reserved.
//

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

@implementation UIButton (EnlargeTouchArea)

static char topNameKey;
static char rightNameKey;
static char bottomNameKey;
static char leftNameKey;

- (void)setEnlargeEdge:(CGFloat) size
{
 objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
 objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
 objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
 objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:size], OBJC_ASSOCIATION_COPY_NONATOMIC);
}

- (void) setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left
{
 objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:top], OBJC_ASSOCIATION_COPY_NONATOMIC);
 objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:right], OBJC_ASSOCIATION_COPY_NONATOMIC);
 objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:bottom], OBJC_ASSOCIATION_COPY_NONATOMIC);
 objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:left], OBJC_ASSOCIATION_COPY_NONATOMIC);
}

- (CGRect) enlargedRect
{
 NSNumber* topEdge = objc_getAssociatedObject(self, &topNameKey);
 NSNumber* rightEdge = objc_getAssociatedObject(self, &rightNameKey);
 NSNumber* bottomEdge = objc_getAssociatedObject(self, &bottomNameKey);
 NSNumber* leftEdge = objc_getAssociatedObject(self, &leftNameKey);
 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;
 }
}

- (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;
}

@end

使用方法：

UIButton *button = [UIButton new];
[button setEnlargeEdge:20];
 //或者
 [button setEnlargeEdgeWithTop:20 right:20 bottom:20 left:20]; 

第二种：直接创建一个UIButton类，然后复写pointInside方法

使用时继承于此类即可

.h文件

#import <UIKit/UIKit.h>

@interface BiggerClickAreaButton : UIButton

@end

.m文件

#import "BiggerClickAreaButton.h"

@implementation BiggerClickAreaButton

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent*)event
{
 CGRect bounds = self.bounds;
 //若原热区小于44x44，则放大热区，否则保持原大小不变
 CGFloat widthDelta = MAX(44.0 - bounds.size.width, 0);
 CGFloat heightDelta = MAX(44.0 - bounds.size.height, 0);
 bounds = CGRectInset(bounds, -0.5 * widthDelta, -0.5 * heightDelta);
 return CGRectContainsPoint(bounds, point);
}

@end

使用时直接继承创建即可。

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