扩大按钮 btn 响应区域

方法一:类别

#import <UIKit/UIKit.h>

#import <objc/runtime.h>

@interface UIButton (EnlargeEdge)

 

- (void)XSsetEnlargeEdge:(CGFloat) size;

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

 

@end

 

#import "UIButton+EnlargeEdge.h"

 

@implementation UIButton (EnlargeEdge)

static char topNameKey;

static char rightNameKey;

static char bottomNameKey;

static char leftNameKey;

 

- (void)XSsetEnlargeEdge:(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)XSsetEnlargeEdgeWithTop:(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;

    }

}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event

{

    CGRect rect = [self enlargedRect];

    if (CGRectEqualToRect(rect, self.bounds))

    {

        return [super pointInside:point withEvent:event];

    }

    return CGRectContainsPoint(rect, point) ? YES : NO;

}

@end

 

 

 

 

 

 

 

方法二:

 

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