這里分兩種
1.button自身frame 以倍數(shù)擴大
2.button自身frame 以上下左右增加邊距擴大

普遍做法震缭， button增加一個分類

廢話不多說直接上代碼
方法一

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIButton (MGTouchArea)
@property (nonatomic, copy) NSString *clickArea;
@end

#import "UIButton+MGTouchArea.h"
#import <objc/runtime.h>
@interface UIButton()
@end
@implementation UIButton (MGTouchArea)
//重寫
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    [super pointInside:point withEvent:event];
    // 獲取bounds 實際大小
    CGRect bounds = self.bounds;
    if (self.clickArea) {
        CGFloat area = [self.clickArea floatValue];
        CGFloat widthDelta = MAX(area * bounds.size.width - bounds.size.width, .0);
        CGFloat heightDelta = MAX(area * bounds.size.height - bounds.size.height, .0);
        //擴大bounds
        bounds = CGRectInset(bounds, -0.5 * widthDelta, -0.5 * heightDelta);
        
    }
    // 點擊的點在新的bounds 中 就會返回YES
    return CGRectContainsPoint(bounds, point);
}
- (void)setClickArea:(NSString *)clickArea
{
    objc_setAssociatedObject(self, @selector(clickArea), clickArea, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (NSString *)clickArea
{
    return objc_getAssociatedObject(self, @selector(clickArea));
}
@end

用法：

// 這里就是按鈕的實際可點擊區(qū)域大小，可點擊面積等效于按鈕的尺寸乘以該參數(shù)
    button.clickArea = @"10";
此處引薦于此篇華文 [https://www.cnblogs.com/CH520/p/12820405.html]
在此表示感謝

方法二

#import <UIKit/UIKit.h>

@interface UIButton (EnlargeTouchArea)

//擴大按鈕點擊范圍
- (void)setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left;

@end

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

@implementation UIButton (EnlargeTouchArea)

static char topNameKey;
static char rightNameKey;
static char bottomNameKey;
static char leftNameKey;

- (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

用法

 [button setEnlargeEdgeWithTop:10 right:500 bottom:10 left:50];