查找使用UITapGestureRecognizer时点击了哪个子视图

我如何知道在使用UIGestureRecognizers时在哪个子视图上发生了事件？

根据文档：

手势识别器对经过测试的特定视图及其所有子视图的触摸进行操作。

据我所知，“视图”属性是

手势识别器所附的视图。

这将是父视图。

这将在事件的位置找到最里面的后代视图。（请注意，如果该子视图具有任何交互式内部私有孙代，则此代码也将找到它们。）

UIView* view = gestureRecognizer.view;
CGPoint loc = [gestureRecognizer locationInView:view];
UIView* subview = [view hitTest:loc withEvent:nil];

在Swift 2中：

let view = gestureRecognizer.view
let loc = gestureRecognizer.locationInView(view)
let subview = view?.hitTest(loc, withEvent: nil) // note: it is a `UIView?`

在Swift 3中

let view = gestureRecognizer.view
let loc = gestureRecognizer.location(in: view)
let subview = view?.hitTest(loc, with: nil) // note: it is a `UIView?`

对于将来的用户...当世界不再使用obj-c时，我现在有了更好的选择...

[sender view]

使用这种方式：

UITapGestureRecognizer * objTapGesture = [self createTapGestureOnView:myTextField];

[objTapGesture addTarget:self action:@selector(displayPickerView:)];

//添加这些方法

-(void)displayPickerView:(UITapGestureRecognizer*)sender
{
    UITextField *textField = (UITextField*)[sender view];
    NSLog(@"tag=  %ld", (long)textField.tag);
}

-(UITapGestureRecognizer*)createTapGestureOnView:(UIView *)view
{
    view.userInteractionEnabled = YES;
    UITapGestureRecognizer * tapGesture = [[UITapGestureRecognizer alloc]init];
    tapGesture.numberOfTapsRequired = 1;
    tapGesture.numberOfTouchesRequired = 1;
    [view addGestureRecognizer:tapGesture];
    return tapGesture;
}