This question already has answers here:
exclude subview from UITapGestureRecognizer
(3 answers)
Closed 9 years ago.
This is how I add gesture on view
- (void)_addPanGestureToView:(UIView *)view {
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(_handlePan:)];
panGesture.delegate = self;
panGesture.maximumNumberOfTouches = 1;
panGesture.minimumNumberOfTouches = 1;
[view addGestureRecognizer:panGesture];
}
Everything is working perfectly, but gesture is on the whole view how could I do something like gesture respond only in half of view?
Why not just use CGRectContainsPoint() and check if the touches location within your view is within the area you want it to be. If it isn't, ignore it:
- (void)panGestureDetected:(UIPanGestureRecognizer *)sender
{
CGPoint location = [sender locationInView:sender.view];
CGRect someRect = ...
if (CGRectContainsPoint(someRect, location)) {
// point is in specified area
}
}
Easiest solution would be adding a transparent view on the area where you want you gesture recognizer to work, and add the gesture to that view (and that view as a subview of course).
Somthing like:
- (void)_addPanGestureToView:(UIView *)view {
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(_handlePan:)];
panGesture.delegate = self;
panGesture.maximumNumberOfTouches = 1;
panGesture.minimumNumberOfTouches = 1;
UIView *viewForGesture = [[UIView alloc] initWithFrame:CGRectMake(....)]; //your frame
[viewForGesture addGestureRecognizer:panGesture];
[view addSubview:viewForGesture];
}
Related
I have an imageview and I want to tap on only one side of imageview. Is it possible to set frame for a gesture? Can anyone help with a solution?
Use UIGestureRecognizerDelegate, i think you can get the idea on how to compare:
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
if ([touch locationInView:yourview].x < somePoint.x) {
return false;
} else {
return true;
}
}
you could overlay a view on top of the imageview and add the tap recognizer to this new view, something like this will make the left hand side of the image tapable
UIView tapView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, imageView.frame.size.width/2, imageView.frame.size.height)];
[imageView addSubView:tapView]
UITapGestureRecognizer *singleFingerTap =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(handleSingleTap:)];
[tapView addGestureRecognizer:singleFingerTap];
You can simply put UIView on top of your imageView with frame as per your requirement and put tap gesture on that UIView.
You can do this by storyboard / xib or by programmatically.
By programmatically, for example - you want to tap only within the area with width of 50 px of your imageView. For this:
UIView *vw = [[UIView alloc] initWithFrame:CGRectMake(imgView.frame.origin.x, imgView.frame.origin.y, 50, imgView.frame.size.height)];
// add gesture to view
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTapGesture:)];
tapGesture.numberOfTapsRequired = 2;
[vw addGestureRecognizer:tapGesture];
[imgView addSubview:vw];
now to handle your double tap
-(void)handleTapGesture:(UITapGestureRecognizer *)gesture
{
// handle double tap
}
I am new in IOS Dev, was searching onclick event for UIView and i found this code that worked perfectly. But it doesnt call specific UIView as i am using multiple UIViews and want to add event on all of them separately while this code calls handleSingleTap onclick of either UIView. plz help..
- (void)viewDidLoad
{
[super viewDidLoad];
UITapGestureRecognizer *singleFingerTap =
[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
[self.view addGestureRecognizer:singleFingerTap];
}
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
CGPoint location = [recognizer locationInView:[recognizer.view superview]];
NSLog(#"Clicked");
}
You can create UITapGestureRecognizer and add it to the views you want it to be clicked.
You can also set up tag property on each view to find out which view was clicked.
For example:
UITapGestureRecognizer *singleFingerTap1 =
[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
view1.tag = 1;
[view1 addGestureRecognizer:singleFingerTap1];
UITapGestureRecognizer *singleFingerTap2 =
[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
view2.tag = 2;
[view2 addGestureRecognizer:singleFingerTap2];
//..and so on
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
UIView *viewClicked = recognizer.view;
NSLog(#"Clicked: %d", viewClicked.tag);
}
The other solution is add one gesture recogniser to the main view (the view which hold the others view, something as you posted) and in handleSingleTap: method check if the point is inside the view:
BOOL isPointInsideView1 = [view1 pointInside:location withEvent:nil];
BOOL isPointInsideView2 = [view1 pointInside:location withEvent:nil];
But ic can failed when one view override another.
I have added longpressGesture recognizer on view & given NoofTouchesRequired=2.I want to get the coordinates of both the views on which i have longpressed.
MyCode is as below:-
//---long press gesture---
UILongPressGestureRecognizer *longpressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector (handleLongpressGesture:)];
longpressGesture.minimumPressDuration = 4;
longpressGesture.numberOfTouchesRequired = 2;
[viewLongPress addGestureRecognizer:longpressGesture];
[longpressGesture release];
UIGestureRecognizer has a locationInView: method just for that.
-(void)handleLongpressGesture:(UIGestureRecognizer *)reco{
UIView *theSuperview = self.view;
CGPoint touchPointInSuperview = [reco locationInView:theSuperview];
}
This question already has answers here:
exclude subview from UITapGestureRecognizer
(3 answers)
Closed 9 years ago.
This is how I add gesture on view
- (void)_addPanGestureToView:(UIView *)view {
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(_handlePan:)];
panGesture.delegate = self;
panGesture.maximumNumberOfTouches = 1;
panGesture.minimumNumberOfTouches = 1;
[view addGestureRecognizer:panGesture];
}
Everything is working perfectly, but gesture is on the whole view how could I do something like gesture respond only in half of view?
Why not just use CGRectContainsPoint() and check if the touches location within your view is within the area you want it to be. If it isn't, ignore it:
- (void)panGestureDetected:(UIPanGestureRecognizer *)sender
{
CGPoint location = [sender locationInView:sender.view];
CGRect someRect = ...
if (CGRectContainsPoint(someRect, location)) {
// point is in specified area
}
}
Easiest solution would be adding a transparent view on the area where you want you gesture recognizer to work, and add the gesture to that view (and that view as a subview of course).
Somthing like:
- (void)_addPanGestureToView:(UIView *)view {
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(_handlePan:)];
panGesture.delegate = self;
panGesture.maximumNumberOfTouches = 1;
panGesture.minimumNumberOfTouches = 1;
UIView *viewForGesture = [[UIView alloc] initWithFrame:CGRectMake(....)]; //your frame
[viewForGesture addGestureRecognizer:panGesture];
[view addSubview:viewForGesture];
}
I have a UIScrollView and inside this I have UILabels. I need to detect touch events for the UILabels. At the moment, it is detecting the touch inside the second label only. It ignores the first.
I have the code -
Creating the UIScrollView
backGroundView = [[UIScrollView alloc] init];
backGroundView.frame= self.view.frame;
backGroundView.userInteractionEnabled = YES;
[backGroundView setScrollEnabled:YES];
backGroundView.showsVerticalScrollIndicator = YES;
backGroundView.contentSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);
backGroundView.delegate = self;
[self.view addSubview:backGroundView];
Creating the UILabel
UILabel *OneDay = [[UILabel alloc] initWithFrame:CGRectMake(15, stockChart.bounds.origin.y + stockChart.bounds.size.height + 35, 40, 30)];
OneDay.text = #"1d";
OneDay.tag = 1;
OneDay.userInteractionEnabled = YES;
OneDay.layer.borderColor = [UIColor grayColor].CGColor;
OneDay.layer.borderWidth = 1.0f;
OneDay.textAlignment = UITextAlignmentCenter;
[OneDay addGestureRecognizer:detectTimeFrameChange];
[backGroundView addSubview:OneDay];
UILabel *FiveDay = [[UILabel alloc] initWithFrame:CGRectMake(45, stockChart.bounds.origin.y + stockChart.bounds.size.height + 35, 40, 30)];
FiveDay.text = #"5d";
FiveDay.tag = 2;
FiveDay.userInteractionEnabled = YES;
FiveDay.layer.borderColor = [UIColor grayColor].CGColor;
FiveDay.layer.borderWidth = 1.0f;
FiveDay.textAlignment = UITextAlignmentCenter;
[FiveDay addGestureRecognizer:detectTimeFrameChange];
[backGroundView addSubview:FiveDay];
Creating the gesturerecognizer
UITapGestureRecognizer *detectTimeFrameChange = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(timeFrameLabelTapped:)];
detectTimeFrameChange.numberOfTapsRequired = 1;
[backGroundView addGestureRecognizer:detectTimeFrameChange];
Handling gesture
-(void)timeFrameLabelTapped:(UITapGestureRecognizer*)recognizer{
if (recognizer.view.tag == 1) {
NSLog(#"One pressed");
}
else if (recognizer.view.tag == 2){
NSLog(#"2 pressed");
}
}
You can use this :
UITapGestureRecognizer *labelTap=[[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(labelTapped)];
labelTap.numberOfTapsRequired=1;
[yourLabel addGestureRecognizer:labelTap];
handle the touch tap event inside labelTapped method:
-(void)labelTapped
{
//your code to handle tap
}
Touch events are not detected on UIScrollview for getting your requirement add tap gestures to your label.
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(singleTapGestureCaptured)];
[OneDay addGestureRecognizer:singleTap];
-(void)singleTapGestureCaptured{
NSLog(#"touch detected");
}
You can find using tapgesturerecogniser like that...
UITapGestureRecognizer *singleFingerTap =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(handleSingleTap:)];
[self.scrollview addGestureRecognizer:singleFingerTap];
//The event handling method
- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer
{
if(recognizer.view.tag == 1){}
//Do stuff here...
}
Where have you written the touchesBegan?
If you want to detect the touches in the label you'll have to create a subclass of label and write your touchesBegan there to detect the touch events
The problem here is that you are trying to use the same gesture recognizer for multiple views. A gesture recognizer can only be attached to a single view at once. You are only receiving events from the last view, because that is the view the recognizer is currently attached to. To fix the issue, simply create a gesture recognizer for each view you want to detect touches in.