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
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#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
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//// 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：
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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
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#import <uikit/uikit.h> @interface biggerclickareabutton : uibutton @end |
.m文件
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#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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://www.cnblogs.com/rglmuselily/archive/2018/08/27/9543075.html
