点击手势子视图触摸检测答案

【问题标题】：Tap Gesture subview touch detect点击手势子视图触摸检测
【发布时间】：2016-09-13 09:41:16
【问题描述】：

我正在创建抽屉

 self.isShowMenuVC = NO;
_menuView = [MenuViewController viewController];
[self.menuView setDelegate:self];
[self addChildViewController:self.menuView];
[self.menuView.view setFrame:CGRectMake(-kMenuTableWidth, 0, kMenuTableWidth, self.view.frame.size.height)];
[self.view addSubview:self.menuView.view];
[self.menuView didMoveToParentViewController:self];

UITapGestureRecognizer *outsideTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(outsideTapped:)];
[self.view addGestureRecognizer:outsideTap];
outsideTap.delegate = self;

当点击按钮时，我只是将_menuView.view 的框架设置为像抽屉一样

我想要检测抽屉外的触摸，但我做不到

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (touch.view == self.menuView.view) {
    NSLog(@"Touch Drawer");
} else {
    NSLog(@"Touch Outside");
}

return YES;
}

但它总是显示 Touch Outside"

我错过了一些东西，但不知道是什么提前谢谢

还尝试使用 2 种手势但不起作用，因为 self.view 中的一种手势因此，当我点击抽屉方法调用 2 次时。

为此我试图禁用一个手势，但仍然调用了两次

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {

if (gestureRecognizer == self.touchInDrawer) {
    NSLog(@"Touch in drawer");
    [self.touchOutSideDrawer setEnabled:NO];
} else {
    NSLog(@"Outside");
    [self hideMenuView];
}
return YES;
}

【问题讨论】：

标签： ios objective-c uitapgesturerecognizer

【解决方案1】：

UITapGestureRecognizer 无法检测到其所属视图之外的触摸。

您需要创建另一个 UITapGestureRecognizer 并将它们添加到 self.menuView.view。

您还可以为手势识别器创建两个@property 并在方法中检查它们：

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if (gestureRecognizer == self.firstGesture) {
    NSLog(@"Touch in first gesture");
} else {
    NSLog(@"Touch in another gesture");
}

【讨论】：

我试过这不起作用，因为我在 self.view 中添加了手势，所以当我点击抽屉手势委托方法时触发 2 次span>
尝试实现delegate的方法： - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 并返回NO；
也尝试实现方法： - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
我用 [self.touchOutSideDrawer setEnabled:NO]; 做到了
但仍有问题

【解决方案2】：

我已经通过添加两个手势解决了这个问题

@property (strong,nonatomic)        UITapGestureRecognizer          *touchInDrawer;
@property (strong,nonatomic)        UITapGestureRecognizer          *touchOutSideDrawer;

根据@Eugene Zaychenko 的回答，但仍然存在问题，因为委托方法调用了两次

当触摸抽屉时我不能[self.touchOutSideDrawer setEnabled:NO];，因为之后它会从视图中移除并且如果[self.touchOutSideDrawer setEnabled:YES];不会再次执行

但最有趣的是

_touchInDrawer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(outsideTapped:)];
[self.menuView.view addGestureRecognizer:self.touchInDrawer];
self.touchInDrawer.delegate = self;

_touchOutSideDrawer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(outsideTapped:)];
[self.view addGestureRecognizer:self.touchOutSideDrawer];
self.touchOutSideDrawer.delegate = self;

outsideTapped 方法只调用一次，所以我将所有代码转移到那里并且正在工作

- (void) outsideTapped:(UITapGestureRecognizer *)gestureRecognizer {

if (gestureRecognizer == self.touchOutSideDrawer) {
    //  [self.view removeGestureRecognizer:self.touchOutSideDrawer];
    [self hideMenuView];
    NSLog(@"Outside");

} else {
    NSLog(@"Touch in drawer");

    // [self.touchOutSideDrawer setEnabled:NO];

}

}

【讨论】：