不多说直接上代码链接

https://github.com/HeYunDong/ExpandButton

 UIButton * testbt = [[UIButton alloc]initWithFrame:CGRectMake(100, 100, 30, 30)];
    testbt.backgroundColor = [UIColor redColor];
    testbt.hitEdgeInsets = UIEdgeInsetsMake(-30, -40, -50, -60);
    
    [testbt addTarget:self action:@selector(chlickbt) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:testbt];

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIButton (LeeHitRect)

/**
 自定义响应边界 UIEdgeInsetsMake(-3, -4, -5, -6). 表示扩大
 例如： self.btn.hitEdgeInsets = UIEdgeInsetsMake(-3, -4, -5, -6);
 */
@property(nonatomic, assign) UIEdgeInsets hitEdgeInsets;


/**
 自定义响应边界 自定义的边界的范围 范围扩大3.0
 例如：self.btn.hitScale = 3.0;
 */
@property(nonatomic, assign) CGFloat hitScale;

/*
 自定义响应边界 自定义的宽度的范围 范围扩大3.0
 例如：self.btn.hitWidthScale = 3.0;
 */
@property(nonatomic, assign) CGFloat hitWidthScale;

/*
 自定义响应边界 自定义的高度的范围 范围扩大3.0
 例如：self.btn.hitHeightScale = 3.0;
 */
@property(nonatomic, assign) CGFloat hitHeightScale;

@end

NS_ASSUME_NONNULL_END

#import "UIButton+LeeHitRect.h"
#import <objc/runtime.h>


static const char * kHitEdgeInsets = "hitEdgeInsets";
static const char * kHitScale      = "hitScale";
static const char * kHitWidthScale      = "hitWidthScale";
static const char * kHitHeightScale      = "hitHeightScale";

@implementation UIButton (LeeHitRect)

#pragma mark - set Method
-(void)setHitEdgeInsets:(UIEdgeInsets)hitEdgeInsets{
    NSValue *value = [NSValue value:&hitEdgeInsets withObjCType:@encode(UIEdgeInsets)];
    objc_setAssociatedObject(self,kHitEdgeInsets, value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

-(void)setHitScale:(CGFloat)hitScale{
    CGFloat width = self.bounds.size.width * hitScale;
    CGFloat height = self.bounds.size.height * hitScale;
    self.hitEdgeInsets = UIEdgeInsetsMake(-height, -width,-height, -width);
    objc_setAssociatedObject(self, kHitScale, @(hitScale), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}


-(void)setHitWidthScale:(CGFloat)hitWidthScale{
    CGFloat width = self.bounds.size.width * hitWidthScale;
    CGFloat height = self.bounds.size.height ;
    self.hitEdgeInsets = UIEdgeInsetsMake(-height, -width,-height, -width);
    objc_setAssociatedObject(self, kHitWidthScale, @(hitWidthScale), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}



-(void)setHitHeightScale:(CGFloat)hitHeightScale{
    CGFloat width = self.bounds.size.width;
    CGFloat height = self.bounds.size.height * hitHeightScale ;
    self.hitEdgeInsets = UIEdgeInsetsMake(-height, -width,-height, -width);
    objc_setAssociatedObject(self, kHitHeightScale, @(hitHeightScale), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}


#pragma mark - get Method
-(UIEdgeInsets)hitEdgeInsets{
    NSValue *value = objc_getAssociatedObject(self, kHitEdgeInsets);
    UIEdgeInsets edgeInsets;
    [value getValue:&edgeInsets];
    return value ? edgeInsets:UIEdgeInsetsZero;
}

-(CGFloat)hitScale{
    return [objc_getAssociatedObject(self, kHitScale) floatValue];
}

-(CGFloat)hitWidthScale{
    return [objc_getAssociatedObject(self, kHitWidthScale) floatValue];
}

-(CGFloat)hitHeightScale{
    return [objc_getAssociatedObject(self, kHitHeightScale) floatValue];
}



#pragma mark - override super method
-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{
    //如果 button 边界值无变化  失效 隐藏 或者透明 直接返回
    if(UIEdgeInsetsEqualToEdgeInsets(self.hitEdgeInsets, UIEdgeInsetsZero) || !self.enabled || self.hidden || self.alpha == 0 ) {
        return [super pointInside:point withEvent:event];
    }else{
        CGRect relativeFrame = self.bounds;
        CGRect hitFrame = UIEdgeInsetsInsetRect(relativeFrame, self.hitEdgeInsets);
        return CGRectContainsPoint(hitFrame, point);
    }
}

@end