Question

我正在尝试使用点击手势识别器来隐藏键盘和下拉表格视图（在另一个视图中以编程方式创建，并在需要时调用）。我在ViewDidLoad中使用的代码是

override func viewDidLoad() {
        super.viewDidLoad()

        tap = UITapGestureRecognizer(target: self, action:Selector("DismissKeyboard"))

        view.addGestureRecognizer(tap!) }

和DismissKeyboard功能

func DismissKeyboard(){       
        view.endEditing(true)
        subviewSchool.removeFromSuperview()
        subviewPosition.removeFromSuperview()
    }

调用Dropdown Table View的按钮操作是

@IBAction func dropDownPosition(sender: AnyObject) {

        var frameForDropDownViewPosition = CGRect()
        var framePosition = selectPositionTextField.frame


        frameForDropDownViewPosition.origin.x = framePosition.origin.x
        frameForDropDownViewPosition.origin.y = studentCell.frame.origin.y + framePosition.origin.y + framePosition.size.height
        frameForDropDownViewPosition.size.width = framePosition.size.width
        frameForDropDownViewPosition.size.height = 300

        subviewPosition = DropDownView(frame:  frameForDropDownViewPosition)
        subviewPosition.delegate = self
        subviewPosition.indicator = "positionStudent"
        subviewPosition.checkposition = schoolKeyId
        subviewPosition.schoolInfoArr = schoolInfoArr

        self.view.addSubview(subviewPosition)
    }

但问题是Tab Gesture确实有效，但是我无法选择下拉视图的包含（想要在被调用时执行某些任务，在索引路径上选择行），因为点击手势不允许我这样做。如何从下拉表视图中删除Tab Gesture（或者有其他方法吗？），因为我可以使用

从所有视图中删除Tab Gesture

self.view.removeGestureRecognizer(tap!)

但不是来自特定的观点（不是计划），所以我可以按照自己的意愿做我的工作。我正在使用Swift

谢谢

Answer 1

添加gestureDelegate：

 UIGestureRecognizerDelegate

在ViewDidLoad中设置点按委托：

tap.delegate = self

然后调用此委托

Swift 2

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
    let p = touch.locationInView(view)
    if CGRectContainsPoint(DropDownView.frame, p) {
      return false
    }
    return true
  }

Swift 4

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
    let p = touch.location(in: view)
    if DropDownView.frame.contains(p) {
        return false
    }
    return true
}

Answer 2

如果您使用textFiled尝试使用textFiledDelegate方法来解除键盘

-(BOOL) textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}

Answer 3

如果要识别多个视图的点按手势。您需要为多个视图添加Tap Gesture SELECTOR。

请检查以下代码，希望它适合您。

- (void)viewDidLoad {
    [super viewDidLoad];

    //Added Tap Gesture to remove keyboard
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(dismissKeyboard)];
    [self.view addGestureRecognizer:tap];

    UITapGestureRecognizer *singleTapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(processSingleTap:)];
    [singleTapGesture setNumberOfTapsRequired:1];
    [singleTapGesture setNumberOfTouchesRequired:1];

    [self.tableViewObj addGestureRecognizer:singleTapGesture];
}

-(void)dismissKeyboard
{
 [[[UIAlertView alloc]initWithTitle:@"Keyboard" message:@"Dismiss keyboard here..." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
}

-(void)processSingleTap:(UITapGestureRecognizer*)gesture
{
    CGPoint pointInTableView = [gesture locationInView:self.tableViewObj];
    NSIndexPath *selectedIndexPath = [self.tableViewObj indexPathForRowAtPoint:pointInTableView];
    UITableViewCell *selectedCell = (UITableViewCell*)[self.tableViewObj cellForRowAtIndexPath:selectedIndexPath];
    if(selectedCell){
       [[[UIAlertView alloc]initWithTitle:@"Cell Selected" message:[NSString stringWithFormat:@"Cell Selected Index...%@",@(selectedIndexPath.row)] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil] show];
    }
    else
    {
        NSLog(@"Cell not selected tap of table view ...");
    }
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 10;
}
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(!cell)
    {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    cell.textLabel.text = [NSString stringWithFormat:@"Cell %@",@(indexPath.row)];
    return cell;
}

Answer 4

您可以检查它是否在UITableView中被点击。

看看这个答案How get UITableView IndexPath from UITableView iphone?。这是一个更好，更简单的方法。

Answer 5

将TapGestureRecognizer拖放到您想要的ViewController中的Main.Storyboard 然后转到文档插座，选择TapGestureRecognizer，按住它拖动它以在IBOutlet

中创建ViewController.swift

为TapGestureRecognizer创建一个插座，将其命名为＆＃34; tap＆＃34;

@IBOutlet var tap: UITapGestureRecognizer!

将UIGestureRecognizerDelegate添加到ViewController

UIGestureRecognizerDelegate

在viewDidLoad()或您感兴趣的@IBAction

tap.delegate = self

然后调用此委托函数

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
    let p = touch.locationInView(view)
    if CGRectContainsPoint(DropDownView.frame, p) {
      return false
    }
    return true
  }

Tab Gesture Recognizer用于特定视图

5 个答案:

Swift 2

Swift 4