扩大UIButton点击范围,直接复制黏贴就可以使用

最新推荐文章于 2021-09-19 14:04:03 发布

原创最新推荐文章于 2021-09-19 14:04:03 发布 · 289 阅读

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#iOS #UIButton #扩大点击范围

本文介绍了一个 UIButton 的扩展方法，该方法允许按钮响应更大的触摸区域，通过设置上下左右四个方向的扩展距离实现。

#import <UIKit/UIKit.h>

#import <objc/runtime.h>

@interface UIButton (SCLargeRange)

- (void)setEnlargeEdge:(CGFloat) size;

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

@end

#import "UIButton+SCLargeRange.h"

@implementation UIButton (SCLargeRange)

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