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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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