iOS· UIGestureRecognizer 与UITouc

1. 回顾：添加手势的步骤

• 初始化时为某视图添加手势及事件
• 实现事件方法
• 设置手势范围

1.1 初始化时添加手势及事件

[self.view addGestureRecognizer:({
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClickAction)];
        tap.delegate = self;
        tap;
    })];

1.2 实现方法事件

- (void)tapClickAction{
    //...
}

1.3 设置手势范围 -- 在UIGestureRecognizerDelegate代理中实现

• UIGestureRecognizer方案

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
        if ([gestureRecognizer locationInView:self.view].y>CGRectGetMaxY(self.topMenuView.bounds)&&[gestureRecognizer locationInView:self.view].y<self.functionalView.y) {
            return YES;
        }
}

• UITouch方案

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
        if ([touch locationInView:self.view].y>CGRectGetMaxY(self.topMenuView.bounds)&&[touch locationInView:self.view].y<self.functionalView.y) {
            return YES;
        }
}

2. 两种类的区别？

UIGestureRecognizer 与UITouch 都有一个 locationInView: 方法。

2.1 视图背景

VC中，self.view添加了一个WKWebView，然后在网页空白除点击。

2.2 实验结果

上面的两种方案中：

• [touch locationInView:self.view] 返回的是点击点在self.view的位置，返回类型为CGPoint，有效，是正确的点击位置。

• [gestureRecognizer locationInView:self.view].y 返回为0，失效。