iOS 扩大点击区域

创建分类，使用objc运行时交换 - (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event 方法的实现，在自己的实现逻辑中进行判断，添加 extendedHitArea属性是你要扩展的可以点击的区域，在pointInside方法里判断点击的坐标是否在可响应点击区域，如果在返回YES，否则返回NO 。

//
//  UIButton+ExtendArea.h
//  ExtendClickArea
//
//  Created by admin on 2020/11/2.
//

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN

@interface UIButton (ExtendArea)
@property(nonatomic,assign) CGRect extendedHitArea;
@end

NS_ASSUME_NONNULL_END

//
//  UIButton+ExtendArea.m
//  ExtendClickArea
//
//  Created by admin on 2020/11/2.
//

#import "UIButton+ExtendArea.h"
#import <objc/runtime.h>
@implementation UIButton (ExtendArea)
// extendHitArea 是暴露出来的一个属性 。
+ (void)load {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Method originalM = class_getInstanceMethod([self class], @selector(pointInside:withEvent:));
        Method swzM = class_getInstanceMethod([self class], @selector(swz_pointInside:withEvent:));
        BOOL addMethod = class_addMethod([self class], @selector(pointInside:withEvent:), method_getImplementation(swzM), method_getTypeEncoding(swzM));
        if (addMethod) {
            class_replaceMethod([self class], @selector(swz_pointInside:withEvent:), method_getImplementation(originalM), method_getTypeEncoding(originalM));
        } else {
            method_exchangeImplementations(originalM, swzM);
        }
    });
}

- (void)setExtendedHitArea:(CGRect)extendedHitArea {
    objc_setAssociatedObject(self, @selector(extendedHitArea), @(extendedHitArea), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (CGRect)extendedHitArea {
    CGRect rect = [objc_getAssociatedObject(self, @selector(extendedHitArea)) CGRectValue];
    if (CGRectEqualToRect(rect, CGRectZero)) {
        return self.bounds;
    }
    return rect;
}

/*!
 @method 可以响应点击事件的rect
 */
- (CGRect)responseHitArea {
    CGRect extendedHitArea = [objc_getAssociatedObject(self, @selector(extendedHitArea)) CGRectValue];
    if (!CGRectEqualToRect(extendedHitArea, CGRectZero)) {
        return                       CGRectMake(
                                     self.bounds.origin.x-extendedHitArea.origin.x,
                                     self.bounds.origin.y-extendedHitArea.origin.y,
                                     self.bounds.size.width+extendedHitArea.origin.x+extendedHitArea.size.width,
                                     self.bounds.size.height+extendedHitArea.origin.y+extendedHitArea.size.height);

    } else {
        return self.bounds;
    }
}

- (BOOL)swz_pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    BOOL result = [self swz_pointInside:point withEvent:event];
    CGRect responseHitArea = [self responseHitArea];
    BOOL ret = ( result
                ||CGRectEqualToRect(responseHitArea, CGRectZero)
                ||!self.isUserInteractionEnabled
                ||self.isHidden);
    if (ret) return result;
    return CGRectContainsPoint(responseHitArea, point);
}
@end

使用方法

//
//  ViewController.m
//  ExtendClickArea
//
//  Created by admin on 2020/11/2.
//

#import "ViewController.h"
#import "UIButton+ExtendArea.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIButton *clickBtn;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.clickBtn.extendedHitArea = CGRectMake(0, 0, 200, 100);
}
- (IBAction)clickBtn:(id)sender {
    NSLog(@"点击了");
}


@end

参考资料

iOS扩大UIButton