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- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    if (!self.isUserInteractionEnabled || self.isHidden || self.alpha <= 0.01) return nil;
    
    CGFloat inset = 45.0f - 78.0f;
    CGRect touchRect = CGRectInset(self.bounds, inset, inset);
    
    if (CGRectContainsPoint(touchRect, point)) {
        for (UIView *subview in [self.subviews reverseObjectEnumerator]) {
            CGPoint convertedPoint = [subview convertPoint:point fromView:self];
            UIView *hitTestView = [subview hitTest:convertedPoint withEvent:event];
            if (hitTestView) {
                return hitTestView;
            }
        }
        return self;
    }
    return nil;
}

// 父视图包含：三个subview self.scrollView\B\C
// 实现：点击B、C也要同点击self.scrollView
// 在父视图里实现以下方法
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *hitTestView = [super hitTest:point withEvent:event];
    if (hitTestView) {
        hitTestView = self.scrollView;
    }
    return hitTestView;
}

// 自定义视图
@implementation CustomShakeView

#pragma mark - Overrid Method

- (BOOL)canBecomeFirstResponder {
    return YES;
}

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    if (motion == UIEventSubtypeMotionShake) {
    		CGFloat width = self.frame.size.width;
    		CGFloat height = self.frame.size.height;
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, height)];
        label.text = @"phone was shaked";
        label.textAlignment = NSTextAlignmentCenter;
        [self addSubview:label];
    }
}

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    // nothing
}

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event {
    // nothing
}
@end

// 视图控制器
@interface ViewController ()
@property (nonatomic, strong) CustomShakeView *shakeView;
@end

@implementation ViewController

- (void)viewDidLoad {
    self.shakeView = [[CustomShakeView alloc] initWithFrame:CGRectMake(0, 250, viewWidth, 60)];
    self.shakeView.backgroundColor = [UIColor grayColor];
    [self.view addSubview:_shakeView];
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.shakeView becomeFirstResponder];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self.shakeView resignFirstResponder];
}