I want to get the scroll direction in webView. I read the code about getting scroll direction here.
-(void)userDidScrollWebView:(id)scrollPoint{
// NSLog(#"scrolled:::");
NSString *x1 = [webView stringByEvaluatingJavaScriptFromString: #"scrollX"];
NSString *y1 = [webView stringByEvaluatingJavaScriptFromString: #"scrollY"];
NSLog(#"scroll x=%# y=%#", x1,y1);
if ([y1 isEqualToString: #"0"]) {
NSLog(#"RELAOD ME");
}
}
I have 2 Questions :-
About this code,I don't know where to call userDidScrollWebView method in my code so that I get regular updates about scrolling.
Another approach, I thought may be I could place Swipe Gesture over Web View but that's not working.
This is how I implemented swipe gesture in UIWebView.
Add <UIGestureRecognizerDelegate> protocol to ViewController.h
In ViewDidLoad Method add the following code:
UISwipeGestureRecognizer * swipeGestureDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(swipeDown)];
swipeGestureDown.numberOfTouchesRequired = 1;
swipeGestureDown.direction = UISwipeGestureRecognizerDirectionDown;
swipeGestureDown.delegate = self;
[self.webView addGestureRecognizer:swipeGestureDown];
Add Delegate method in ViewController.m :
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
-(void)swipeDown
{
NSLog(#"swipe down in webView");
}
Similarly you can add another gesture for swipe Up.
Related
I am using the Texture/AsyncDisplayKit library:
https://github.com/texturegroup/texture
I am trying to implement "swipe to perform action" in a ASCellNode. The problem is that the UIPanGestureRecognizer prevents the table from scrolling.
I am able to successfully get this to work in UIKit using UITableViewCell but for some reason it's not working when using Texture's ASCellNode. I can demonstrate the issue easily with the ASDKgram example provided with this library which has both a UIKit example in one tab and Texture example in another tab:
https://github.com/TextureGroup/Texture/tree/master/examples/ASDKgram
For the UIKit example, all I had to do was:
Add <UIGestureRecognizerDelegate> to PhotoTableViewCell.h
Add UIPanGestureRecognizer *_panGestureRecognizer; in the #implementation PhotoTableViewCell
Add following to the - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier:
_panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(panned:)];
_panGestureRecognizer.delegate = self;
[self.contentView addGestureRecognizer:_panGestureRecognizer];
Add following:
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
if (gestureRecognizer == _panGestureRecognizer) {
CGPoint v = [_panGestureRecognizer velocityInView:_panGestureRecognizer.view];
return fabs(v.x) > fabs(v.y);
}
return false;
}
-(void)panned:(UIPanGestureRecognizer *)sender{
NSLog(#"Panned!");
}
This was enough to get it to print Panned! when panning horizontally and also let the UITableView scroll when it's vertical direction.
The same does not work for the PhotoCellNode. I did the following:
Add <UIGestureRecognizerDelegate> to PhotoCellNode.h
Add UIPanGestureRecognizer *_panGestureRecognizer; in the #implementation PhotoCellNode
Add following to the PhotoCellNode.m:
- (void)didLoad {
[super didLoad];
_panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(panned:)];
_panGestureRecognizer.delegate = self;
[self.view addGestureRecognizer:_panGestureRecognizer];
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
if (gestureRecognizer == _panGestureRecognizer) {
CGPoint v = [_panGestureRecognizer velocityInView:_panGestureRecognizer.view];
return fabs(v.x) > fabs(v.y);
}
return false;
}
-(void)panned:(UIPanGestureRecognizer *)sender{
NSLog(#"Panned!");
}
This allows Panned! to print when panning horizontally but the table does not scroll at all. Why are they working differently? How can I make the table scroll when the touches are vertical?
I have more than 20 viewcontrollers in my project and added swipe gesture in global viewcontroller class.
UISwipeGestureRecognizer *rightSwipeGesture = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:#selector(navigateToPreviousScreen:)];
rightSwipeGesture.cancelsTouchesInView = YES;
rightSwipeGesture.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:rightSwipeGesture];
And override all sub class
- (void)navigateToPreviousScreen:(UISwipeGestureRecognizer *)sender {
[self.navigationController popViewControllerAnimated:YES];}
Now i got a problem (not exactly a problem), The some of the viewcontrollers has tableviews and that swipe is not work sometimes(also got some touch sensitive issue). Is there a way to solve it. I set cancelsTouchesInView = No but seems problem occurs.
Thanks in Advance.
You should be able to fix this by implementing & returning YES in the following UIGestureRecognizerDelegate method in the parent class.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
return YES;
}
I recently got into trouble with a View Controller which has a UIWebView in it and a subview which I would like to add to the View Controller.
That's the View with the UIWebView:
http://cl.ly/image/03473l0e3a2L
My target is, to add a Share Menu which does work without problems:
http://cl.ly/image/3b273t2o3P00
But now I have the problem, that I set gesture recognizers for the social icons + labels (twitter,facebook,mail) - but these gesture recognizers don't do anything.
The ShareView is a UIView Subclass and I add the Gesture Recognizers this way:
UITapGestureRecognizer *fbTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(fbTapped:)];
fbTap.numberOfTapsRequired = 1;
fbTap.numberOfTouchesRequired = 1;
fbTap.delegate = self;
[fbImage addGestureRecognizer:fbTap];
[fbLabel addGestureRecognizer:fbTap];
UITapGestureRecognizer *twTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(twTapped:)];
twTap.numberOfTapsRequired = 1;
twTap.numberOfTouchesRequired = 1;
twTap.delegate = self;
[twImage addGestureRecognizer:twTap];
[twLabel addGestureRecognizer:twTap];
UITapGestureRecognizer *mailTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(mailTapped:)];
mailTap.numberOfTapsRequired = 1;
mailTap.numberOfTouchesRequired = 1;
mailTap.delegate = self;
[mailImage addGestureRecognizer:mailTap];
[mailLabel addGestureRecognizer:mailTap];
I think the Label and the UIImageView names do explain themselves. Every Label and ImageView has set userInteractionEnabled to YES. The ShareView is also enabled for Userinteractions and I did set UIGestureRecognizerDelegate to it.
The fbTapped,mailTapped and twTapped functions do send a Notification to the Main View (the view which has the webview and the ShareView in it).
But now when I click on the labels or imageviews, nothing happendes.
I did read on stackoverflow that the UIWebView in the MainView could interrupt the recognization? But I don't know how to solve this problem.
Would be really happy If you could help me or point me into the right direction to solve this problem.
I hope this piece of code will point you to the right direction:
1.Add a gesture recognizer delegate :
#interface myclass <UIGestureRecognizerDelegate>
{
//Whatever you are doing with gestures
}
2.Implement the delegate method:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
//Do your stuff
return YES;
}
check if the control reaches this delegate
I have an app with a MKMapView and code that is called each time the map changes locations (in regionDidChangeAnimated). When the app initially loads, regionDidChangeAnimated is called on pans (swipes), pinches, taps and buttons that explicitly update the map coordinates. After loading other views and coming back to the map the regionDidChangeAnimated is only called for taps and the buttons that explicitly update the map. Panning the map and pinches no longer call regionDidChangeAnimated.
I have looked at this stackoverflow post which did not solve this issue. The forum posts on devforums and iphonedevsdk also did not work. Does anyone know what causes this issue? I am not adding any subviews to MKMapView.
I did not want to initially do it this way, but it appears to work with no problems so far (taken from devforums post in question):
Add the UIGestureRecognizerDelegate to your header.
Now add a check for the version number... If we're on iOS 4 we can do this:
if (NSFoundationVersionNumber >= 678.58){
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(pinchGestureCaptured:)];
pinch.delegate = self;
[mapView addGestureRecognizer:pinch];
[pinch release];
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(panGestureCaptured:)];
pan.delegate = self;
[mapView addGestureRecognizer:pan];
[pan release];
}
Add the delegate methods to handle the gestures:
#pragma mark -
#pragma mark Gesture Recognizers
- (void)pinchGestureCaptured:(UIPinchGestureRecognizer*)gesture{
if(UIGestureRecognizerStateEnded == gesture.state){
///////////////////[self doWhatYouWouldDoInRegionDidChangeAnimated];
}
}
- (void)panGestureCaptured:(UIPanGestureRecognizer*)gesture{
if(UIGestureRecognizerStateEnded == gesture.state){
///////////////////[self doWhatYouWouldDoInRegionDidChangeAnimated];
}
}
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer{
return YES;
}
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch: (UITouch *)touch{
return YES;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
return YES;
}
By default, when swipe a mapkit view, the map moves. This is great.
If I want to move away from the map view and load another viewcontroller's view, how do I accomplish that? I could add a button to do that, but I'd like to use gesture.
Thanks
THE FOLLOWING CODE WORKED:
(1) In the map view controller's header file, I added UIGestureRecognizerDelegate to support its protocol
(2) In map view controller's .m file , I added
- (BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
(3) In map view controllers viewDidLoad method I added:
UISwipeGestureRecognizer *leftSwipe =
[[[UISwipeGestureRecognizer alloc]
initWithTarget:self action:#selector(leftSwipeReceiver:)] autorelease];
leftSwipe.direction = UISwipeGestureRecognizerDirectionLeft;
leftSwipe.delegate = self;
[self.view addGestureRecognizer:leftSwipe];
(4) This follow function is called for a left-swipe
- (void)leftSwipeReceiver:(UIGestureRecognizer *)recognizer
{
NSLog(#"leftSwipeReceiver:");
}