扩大Button按钮的点击区域

最新推荐文章于 2022-04-18 16:46:58 发布

原创最新推荐文章于 2022-04-18 16:46:58 发布 · 448 阅读

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本文介绍了一个 UIButton 的 Objective-C 扩展，该扩展允许设置按钮的点击区域大小，通过设置四个边距来实现点击区域的扩大，适用于需要调整 UIButton 触发区域的应用场景。

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//
// UIButton+RM.h
// ProjectManageEx
//
// Created by mac on 16/7/31.
// Copyright © 2016年 zhangjian01. All rights reserved.
//

#import

@interface UIButton (RM)

@property (nonatomic, assign)CGFloat enlargedEdge;

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

@end
//
// UIButton+RM.m
// ProjectManageEx
//
// Created by mac on 16/7/31.
// Copyright © 2016年 zhangjian01. All rights reserved.
//

#import "UIButton+RM.h"

@implementation UIButton (RM)

static char topEdgeKey;
static char leftEdgeKey;
static char bottomEdgeKey;
static char rightEdgeKey;

- (void)setEnlargedEdge:(CGFloat)enlargedEdge{

    [self setEnlargedEdgeWithTop:enlargedEdge left:enlargedEdge bottom:enlargedEdge right:enlargedEdge];

}

- (CGFloat)enlargedEdge{
    return [(NSNumber *)objc_getAssociatedObject(self, &topEdgeKey)floatValue];
}

- (void)setEnlargedEdgeWithTop:(CGFloat)top left:(CGFloat)left bottom:(CGFloat)bottom right:(CGFloat)right{

    objc_setAssociatedObject(self, &topEdgeKey, [NSNumber numberWithFloat:top], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    objc_setAssociatedObject(self, &leftEdgeKey, [NSNumber numberWithFloat:left], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    objc_setAssociatedObject(self, &bottomEdgeKey, [NSNumber numberWithFloat:bottom], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
    objc_setAssociatedObject(self, &rightEdgeKey, [NSNumber numberWithFloat:right], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (CGRect)enlargedRect{
    NSNumber *topEdge = objc_getAssociatedObject(self, &topEdgeKey);
    NSNumber *leftEdge = objc_getAssociatedObject(self, &leftEdgeKey);
    NSNumber *bottomEdge = objc_getAssociatedObject(self, &bottomEdgeKey);
    NSNumber *rightEdge = objc_getAssociatedObject(self, &rightEdgeKey);

    if (topEdge && leftEdge && bottomEdge && rightEdge) {

        CGRect enlargedRect = CGRectMake(self.bounds.origin.x - leftEdge.floatValue, self.bounds.origin.y - topEdge.floatValue, self.width + leftEdge.floatValue + rightEdge.floatValue, self.height + topEdge.floatValue + bottomEdge.floatValue);
        return enlargedRect;
    }else{

        return self.bounds;
    }
}

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{

    if (self.alpha <= 0.01 || !self.userInteractionEnabled || self.hidden) {
        return nil;
    }
    CGRect enlargedRect = [self enlargedRect];
    return CGRectContainsPoint(enlargedRect, point) ? self : nil;

}

@end