UIView swipe gesture conflicts with tableview in objective c - ios

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;
}

Related

table view with UITapGestureRecognizer

Hi I am developing small IOS application in which I want to display search bar and below it table view. In which I want to hide keyboard when user click outside. For that reason I am using tap recogniser but becoz of that my table view stops listening for row selection.
Here Is my code
//inside view did load
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:#selector(dismissKeyboard)];
[self.view addGestureRecognizer:tap];
-(void)dismissKeyboard {
[_searchBar resignFirstResponder];
}
but because of this my row selection of table view get disable. that mean didSelectRowAtIndexPath never get called. Any one have solution for this. Need Help. Thank you .
Try adding this line of code this will solve your problem..
tap.cancelsTouchesInView = NO;
You should implement UIGestureRecognizerDelegate and add the following:
//inside view did load
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:#selector(dismissKeyboard)];
tap.delegate = self;
[self.view addGestureRecognizer:tap];
// UIGestureRecognizerDelegate methods
#pragma mark UIGestureRecognizerDelegate methods
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if ([touch.view isDescendantOfView:yourTableView]) {
// Don't let selections of auto-complete entries fire the
// gesture recognizer
return NO;
}
return YES;
}
There is a "Search Bar and Search Display Controller" in the Utilities panel that sounds like it would be perfect for you. This is a good tutorial that explains how to implement it. This way you won't have the keyboard issue anymore.
There is no need to use TapGestureRecognizer. Use SearchBarDisplayController
hope this will work for you
download a demo project

tableView is hiding due to a gestureRecognizer before it can execute didSelectRowAtIndexPath

I am trying to handle tableViewCell's being tapped, but the problem is that this is a "temporary tableView". I have it coded so that it will appear while the user is editing a UITextField, but then I set up a gesture recognizer to set the tableview to hidden as soon as the user clicks somewhere away from the UITextField.
I have the gesture recognizer set up as follows:
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:#selector(dismissKeyboard)];
[tap setCancelsTouchesInView:NO];
[self.view addGestureRecognizer:tap];
However, dismissKeyboard is called before didSelectRowAtIndexPath is called, and so the TableView that I want to handle the event on becomes hidden and therefore this function is never called.
My question is: Does anybody have ideas of how to get around this, so that didSelectRowAtIndexPath will execute before the tableView hides? I had one idea to somehow see if the tableView is where the tap is coming from, and if so, then don't execute the "hide tableView" line within dismissKeyboard. Is this possible?
Sorry, but I am new to iOS dev, so thank you for any advice!
You should be able to do this by making your view controller the tap gesture's delegate and denying it any touches that are inside the table view. Here is a starting point:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gesture shouldReceiveTouch:(UITouch *)touch
{
//Assuming your table view is a direct subview of the gesture recognizer's view
BOOL isInsideTableView = CGRectContainsPoint(tableView.frame, [touch locationInView:gesture.view])
if (isInsideTableView)
return NO;
return YES;
}
Hope this helps!
You could set yourself as a delegate to the UITapGestureRecognizer and cancel the gesture when the user taps within the tableView.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
//You can also (and should) check to make sure the gestureRecognizer is the tapGestureRecognizer
if (touch.view == tableView)
{
return NO;
}
else
{
return YES;
}
}
To better fit what you need, judge if your search bar is first responder.
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gesture shouldReceiveTouch:(UITouch *)touch
{
BOOL isInsideTableView = CGRectContainsPoint(yourTabelView.frame, [touch locationInView:gesture.view]);
if (isInsideTableView && ![yourSearchBar isFirstResponder])
return NO;
return YES;
}

Subview and UIWebView UIGesture doesn't work

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

Button calc stopped working

I have a simple program that does a calculation on a button press. The result is placed into a label using the following code:
//converts the float to 2 descimal places then converts it to a string
NSString *stringRectResult=[[NSString alloc]
initWithFormat:#"%1.2f",floatCalcResult];
//displays the string result in the label
resultLabel.text=stringRectResult;
It works perfectly, however, I added in code to hide the decimal keyboard when the user touches off the keyboard. That works, but when I added this code the button to update the label no longer worked. Can anyone help? The code to hide the keyboard is below. The app works when I comment it out but does not when it is active
In viewDidLoad:
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(tap:)];
[self.view addGestureRecognizer:tapRecognizer];
Tap selector...
-(void)tap:(UIGestureRecognizer *)gr
{
[self.view endEditing:YES];
}
Thanks for any and all help.
The problem is that by intercepting all of the user's taps (in order to hide the keyboard), you're preventing any other user interface elements from being tapped. I would urge you to rethink your design; it's not usually necessary to have an explicit facility to hide the keyboard.
If you do want to keep this design, you can implement the gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: method in your class:
- (void) viewDidLoad
{
// ...
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(tap:)];
tapRecognizer.delegate = self;
[self.view addGestureRecognizer:tapRecognizer];
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
return YES;
}
Two things to keep in mind:
You need to mark your view controller as conforming to the UIGestureRecognizerDelegate protocol.
If you later add a second gesture recognizer to the view, you'll need to add a check inside the second method to treat the second recognizer differently.

Swipe a mapkit away from view

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:");
}

Resources