uigesturerecognizer

问题 I am setting up a UITextView with a tap gesture recognizer so that I can do various things after the textView is tapped. For one I want the text view to be the "selected" view after it is tapped, like so: selectedTextView = (UITextView *)recognizer.view; It works, except that after the text view goes into text edit mode, reveling the keyboard and allowing text editing, thereafter my custom tap gesture recognizer no longer works. Any way around this? 回答1: You might just need to return YES for

问题 I am setting up a UITextView with a tap gesture recognizer so that I can do various things after the textView is tapped. For one I want the text view to be the "selected" view after it is tapped, like so: selectedTextView = (UITextView *)recognizer.view; It works, except that after the text view goes into text edit mode, reveling the keyboard and allowing text editing, thereafter my custom tap gesture recognizer no longer works. Any way around this? 回答1: You might just need to return YES for

问题 I have a view which needs to detect "Touch Down" action on the full view, after I found out normal UITapGestureRecognizer can't accomplish it, I customize UIestureRecognizer class to achieve it, using this. So it does work, but I have several buttons on the view, after I can detect the Touch Down action for the view, those buttons stop to work. I need both of them to work, the view to detect Touch Down and the buttons can be pressed above the view. How can I achieve it? To be clear, those

问题 My code needs some help from professional xcoders :-) I have a draggable uitextview called "headline" that is a subview in "mainstage". I also added a pinch gesture to change the fontsize inside the uitextview. Everything works fine but the last essential feature that I really need is the rotation of the uitextview. So I added a uislider for rotation and volia! it also works. But after this transformation the uitextview goes crazy* when it becomes a new size via the pinch gesture. (*The

问题 I need to detect Pan and Tap on the same view, but the tap action is also the first action for pan, so I assume the Tap action need the Pan action to be failed, but then does it make any delay as it has to wait a little bit in order to know if a tap is followed by a movement for a Pan? Thanks 回答1: the tap action is not the first action for a pan. the tap happens after touch up (e.g. the user lifts their finger). the pan happens while the touch is still down (e.g. the finger is pressing on the

问题 I have a label on the UIImageView as below. The label is draggable, pan-able and pinch-able. However I can only do one gesture at a time. For example, I want to drag the label while I'm pinching it like in texts on images in Snapchat and Whatsapp. My functions are as below. As I searched, I think I should create a custom gesture recognizer but I don't know how. Is there any way I can do it without creating a custom recognizer? I got help from this post while doing this: Snapchat-like text on

问题 In my iPhone App I have used shake gesture it is working but it requires lots of efforts to shake Is there any way to make it more sensitive or increase the sensitivity? here is the code - (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { if (motion == UIEventSubtypeMotionShake) { [self performSelector:@selector(startPressed:)]; } } Please help and Suggest. Thanks 回答1: The isnt a way to do it directly as far as I'm aware. One way to get around this would be to use the

问题 I have as view, in which I want to perform a swipe right gesture. Unfortunately I receive the error EXC_BAD_ACCESS. Does anybody know what's wrong here ? Please a look at the code below. extension UIView { func addGestureRecognizerWithAction(nizer: UIGestureRecognizer, action:() -> ()) { class Invoker { var action:() -> () init(action:() -> ()) { self.action = action } func invokeTarget(nizer: UIGestureRecognizer) { self.action() println("Hi from invoker") } } addGestureRecognizer(nizer)

问题 So my game uses swipe gestures, in my didMoveToView() function I have these gestures initialized: let swipeRight = UISwipeGestureRecognizer() swipeRight.direction = UISwipeGestureRecognizerDirection.Right self.view?.addGestureRecognizer(swipeRight) let swipeLeft = UISwipeGestureRecognizer() swipeLeft.direction = UISwipeGestureRecognizerDirection.Left self.view?.addGestureRecognizer(swipeLeft) let swipeUp = UISwipeGestureRecognizer() swipeUp.direction = UISwipeGestureRecognizerDirection.Up

问题 I would like to know how we can use UIPinchGestureRecognizer to scale UIView in single (x or y) directions alone. Say, if the user moves his two fingers in a pinch gesture only in a single direction (horizontal), only the width of the uiview should increase/decrease and if the fingers are moved only vertically, the height should change. If the fingers move diagonally, then both height and width of uiview should increase/decrease. I have seen the MoveMe sample code from Apple.