UIButton 扩大按钮的响应区域

本文主要是介绍UIButton 扩大按钮的响应区域，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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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