Increase button hit area by changing the Edge Inset. UIButton with UIEdgeInsetsMake.

#import <objc/runtime.h>

@implementation UIButton (Extensions)

@dynamic hitTestEdgeInsets;

static const NSString *KEY_HIT_TEST_EDGE_INSETS = @"HitTestEdgeInsets";

-(void)setHitTestEdgeInsets:(UIEdgeInsets)hitTestEdgeInsets {

    NSValue *value = [NSValue value:&hitTestEdgeInsets withObjCType:@encode(UIEdgeInsets)];

    objc_setAssociatedObject(self, &KEY_HIT_TEST_EDGE_INSETS, value, OBJC_ASSOCIATION_RETAIN_NONATOMIC);

}

-(UIEdgeInsets)hitTestEdgeInsets {

    NSValue *value = objc_getAssociatedObject(self, &KEY_HIT_TEST_EDGE_INSETS);

    if(value) {

        UIEdgeInsets edgeInsets; 
       [value getValue:&edgeInsets]; 
       return edgeInsets;

    }else {

        return UIEdgeInsetsZero;

    }

}

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

    if(UIEdgeInsetsEqualToEdgeInsets(self.hitTestEdgeInsets, UIEdgeInsetsZero) ||       !self.enabled || self.hidden) {

        return [super pointInside:point withEvent:event];

    }

    

    CGRect relativeFrame = self.bounds;

    CGRect hitFrame = UIEdgeInsetsInsetRect(relativeFrame, self.hitTestEdgeInsets);

    

    return CGRectContainsPoint(hitFrame, point);

}

@end

Usage-

 _backBtn = [[UIButton alloc]initWithFrame:CGRectMake(16, 12, 28, 28)];    

    [_backBtn setBackgroundImage:[UIImage imageNamed:@"backphoto"] forState:UIControlStateNormal];

    [_backBtn addTarget:self action:@selector(backButtonClicked) forControlEvents:UIControlEventTouchUpInside];

    [_backBtn setHitTestEdgeInsets:UIEdgeInsetsMake(-15, -15, -15, -15)];//increase the hit area of button by 15 on all sides top,left,bottom,right