Tab手势识别器可提供特定视图

Question

I am trying to use tap gesture recognizer to hide keyboard and drop down table view (which is created programatically in another view and is called when needed). The code I used in ViewDidLoad is

override func viewDidLoad() {
        super.viewDidLoad()

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

        view.addGestureRecognizer(tap!) }

and DismissKeyboard function is

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

Button action to call Dropdown Table View is

@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)
    }

But the problem is that Tab Gesture did work but I am Unable to Select the contain of Drop Down view (want to perform certain task when called did select row at index path) as tap gesture is not allowing me to do so. How can I remove Tab Gesture from Drop Down Table View (or is there an alternative way?), as I can remove Tab Gesture from all view using

self.view.removeGestureRecognizer(tap!)

but not from specific view (which is not as plan), so that I can do my work as I desire. I am using Swift

Thank you

Answer 1

Add gestureDelegate:

 UIGestureRecognizerDelegate

In ViewDidLoad set tap delegate:

tap.delegate = self

Then call this delegate

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

if you are using the textFiled try by using textFiledDelegate Method for dismissing keyboard

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

Answer 3

If you want to recognise Tap gesture for multiple view. You need to add Tap Gesture SELECTOR for multiple views.

Please check below code hope it works for you.

- (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

You can check if it was tapped inside UITableView.

Just have a look at this answer How get UITableView IndexPath from UITableView iphone? . It's a much better and a simple way.

Answer 5

Drag and drop, the TapGestureRecognizer on to the ViewController in Main.Storyboard you want this then go to documents outlet, select the TapGestureRecognizer , Control drag it to create IBOutlet in the ViewController.swift

create an outlet for TapGestureRecognizer , name it " tap "

@IBOutlet var tap: UITapGestureRecognizer!

add UIGestureRecognizerDelegate to the ViewController

UIGestureRecognizerDelegate

in viewDidLoad() or in the @IBAction of your interest

tap.delegate = self

Then call this delegate function

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