In one of my application, I don't want to show any video controllers. But I need to get the touch on the media player view. I need to do some other action on touch on the movie player. How can I implement that. Please help
Thanks in advance.
You can always attach a UITapGestureRecognizer to the view and handle the taps.
UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
[moviePlayer.view addGestureRecognizer:tap];
[tap release];
And handle the tap in handleTap:
- (void)handleTap:(UITapGestureRecognizer *)gesture {
// Do some other action as intended.
}
Of course this works only on iOS 3.2 and later.
You can also use this delegate method of UIGestureRecognizer.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch;
Related
I have added Long Tap gesture on UIWebView. But I want UIWebView to process a standard Tap event before my Long Tap will be recognized. (Two gestures should be processed on Long Tap - a simple Tap and my Long Tap). How to do this?
I think it's required to send Tap event to UIWebView on TouchBegin. Is it correct?
The correct code:
- (void)viewDidLoad {
UILongPressGestureRecognizer* gesture = [[[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(handleLongPress:)] autorelease];
gesture.delegate = self;
[myWebView addGestureRecognizer:gesture];
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
Please refer this section UIGestureRecognizerDelegate
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIGestureRecognizerDelegate_Protocol/Reference/Reference.html
you found this is called when 2 gesture simultaneous work.
gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer:
Can i show a Tool tip like this:
Also, I want to show this tool tip when that area is pressed and HOLD. Is there a handler for this gesture?
You can do that in didSelectRowAtIndex method of TableViewController delegate method.
Look here. It is best implementation to have Popover controllers in iPhone. Download run and integrate into your code and change according to your requirement.
In addition to what #jennis said, there is indeed a way to capture long hold gestures you could use UILongPressGestureRecognizer
like this
UILongPressGestureRecognizer *gesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longHold)];
[cell addGestureRecognizer:gesture];
and longHold method
- (void) longHold
{
//Cell has recieved gesture
}
It works, I agree with Omar Abdelhafith
-(void)viewWillAppear:(BOOL)animated
{ //gesture declared in .h file
gesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longHold)];
[your view addGestureRecognizer:gesture];
}
-(void)longHlod
{
//do whatever you want
}
Im slightly confused by a method in the UIGestureRecognizerDelegate protocol. When I implement the delegate method below, I don't seem to ever get my UITapGestureRecognizers sent to this method with their state as UIGestureRecognizerStateRecognized. They are always in the state UIGestureRecognizerStatePossible. Is this right?
Below is the test code I used to setup my Tap Gesture and my test implementation of the delegate method:
UITapGestureRecognizer *singelTap = [[UITapGestureRecognizer alloc] initWithTarget:nil action:nil];
singelTap.numberOfTapsRequired = 1;
singelTap.delegate = self;
[self.view addGestureRecognizer:singelTap];
.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
int i = 0;
if(gestureRecognizer.state == UIGestureRecognizerStateBegan){
i=1;
}
if(gestureRecognizer.state == ..... //testing for all possible states...
return YES;
}
This is correct. When you implement the
(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
method, you get an opportunity to decide if the UIGestureRecognizer should receive the touch. That means that it has not received the touch yet. Because the UIGestureRecognizer in question has not received anything to do with that particular touch yet, it hasn't been able to determine if it Recognized it or not; thus it remains in the state UIGestureRecognizerStatePossible during this method.
If you return YES from the method, the touch will be sent to the UIGestureRecognizer.
Only then will the UIGestureRecognizer handle the touch.
The UIGestureRecognizerDelegate protocol is only to fine-tune the gesture recognizer's behavior. The actual recognition of events is done by setting a target and a selector:
UITapGestureRecognizer *gr = [[[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(handleTap:)] autorelease];
// add gr to a view
-(void)handleTap:(UITapGestureRecognizer*)tg
{
if ( tg.state != UIGestureRecognizerStateRecognized ) return;
NSLog(#"tap recognized");
}
In most cases, you can safely ignore the UIGestureRecognizerDelegate protocol.
Found this in the documents
This method is called before touchesBegan:withEvent: is called on the gesture recognizer for a new touch.
So I guess the touch can only ever be in the 'possible' state.
I've got an app that displays a page of text with the ability to tap a button or swipe in a view to advance or retreat through various pages. The container view has two UISwipeGestureRecognizers attached, for swipe left and swipe right. No trouble with these gestures. But now I'm trying to add UITapGestureRecognizer to another view, providing an ability similar to iBooks or the Kindle app, tap the left to go back, the right to go forward. Nothing I do can get the gesture to fire. No hint that it is ever being triggered, even if I put the gesture on my topmost view and disable other gestures.
The view controller implements UIGestureRecognizerDelegate, though I've not needed to implement delegate methods. I did try implementing shouldReceiveTouch: without success.
Here's a snippet of code where I create and attach the gesture recognizer:
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapGestureTurnPage:)];
[self.view addGestureRecognizer:recognizer];
[recognizer release];
Try this on the view you're adding the gesture recognizers:
view.userInteractionEnabled = YES;
You mention that you've tried this, but just in case go through it again.
Try using the delegate with <UIGestureRecognizerDelegate> in the header and then setting the delegate:
UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapGestureTurnPage:)];
[self.view addGestureRecognizer:recognizer];
recognizer.delegate = self;
[recognizer release];
Then implement this method:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldReceiveTouch:(UITouch *)touch {
return YES;
}
Then use a debugger or toss an NSLog into the above method and also tapGestureTurnPage: to see if these methods are being called.
Add this where you initialize the gesture:
recognizer.delegate = self;
and add this in the "self" class:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
This allows me to have gestures recognized on the UIWebView, and the UIWebView will still respond to the taps. (which i wanted - you may not)
Hello I have an opengl view and on that I have a tab bar. I'm using a tap recognizer to tap different 3d objects on screen. In the tab bar I have a button but it doesn't work because the tap recognizer catches these taps too. How do I stop this? I've already tried this:
- (BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if ([touch.view isKindOfClass:[UIBarButtonItem class]]) return FALSE;
return TRUE;
}
I think I am somehow comparing wrong classess because when I debug it returns TRUE always.
Or you can just do [singleTap setCancelsTouchesInView:NO]. Example:
UITapGestureRecognizer *singleTap = [
[UITapGestureRecognizer alloc]
initWithTarget: self
action: #selector(yourSelector:)
];
[singleTap setCancelsTouchesInView:NO];
[[self view] addGestureRecognizer: singleTap];
if ([touch.view.superview isKindOfClass:[UIToolbar class]]) return FALSE;
This is how I got it to work. The superview is a UIToolbar, probably UIBarButtonIttem is a view after all.