iOS UIButton扩大按钮响应区域的解决方法

2019-10-21 18:39:53

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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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