有趣的分类总结2(UIView+WJEnlargeArea)

1.在界面中难免会遇到UIImageView 太小了,不好点击所以要扩大它的点击范围。
我使用分类UIView+WJEnlargeArea实现:

Paste_Image.png

这样可以将greenView的点击范围加大40.

import "UIView+WJEnlargeArea.h"

import <objc/runtime.h>

@implementation UIView (WJEnlargeArea)
static const char topNameKey;
static const char rightNameKey;
static const char bottomNameKey;
static const char leftNameKey;

  • (void) setEnlargeEdge:(CGFloat) edge
    {
    [self setEnlargeEdgeWithTop:edge right:edge bottom:edge
    left:edge];
    }
  • (void) setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left
    {
    objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:top], OBJC_ASSOCIATION_COPY_NONATOMIC);
    NSNumber* topEdge = objc_getAssociatedObject(self, &topNameKey);
    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;
    }
    }
    -(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
    {
    CGRect rect = [self enlargedRect];
    return CGRectContainsPoint(rect, point)?self:nil;
    }
    @end
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