Hey, I want to be able to check if user touches my UIView so I can dismiss my picker how can I do it actually? Thanks!
Try adding a UITapGestureRecognizer to your UIView class in the viewDidLoad of the UIViewController subclass that contains your UIView. It would look something like this:
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(viewTapped:)];
tap.numberOfTapsRequired = 1;
[self.aView addGestureRecognizer:tap];
[tap release];
}
Then implement a handler for the tap which, based on the above code, would look like this:
-(void)viewTapped:(UITapGestureRecognizer *)recognizer {
//Add in your picker dismissal code here
}
Hope this helps,
Justin
Related
I have declared a void touchesbegan method in my controller but it doesn't work! i don't know why. i have an image view which i plan to click it to move to next controller. so i set the touches began method. i have linked the image view in the xib file but when i click the image. nothing happens. Please help, Thanks.
ViewController.h
#import <UIKit/UIKit.h>
#interface imageViewViewController : UIViewController
{
IBOutlet UIImageView *testing;
}
#property(nonatomic, retain) IBOutlet UIImageView *testing;
#end
ViewController.m
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if(touch.view == testing)
{
TestViewController *testviewcontroller = [[TestViewController alloc]initWithNibName:nil bundle:nil];
[self.navigationController pushViewController:testviewcontroller animated:YES];
}
}
#end
P.S.
here i tried another method using tap gestures.
testing is the name of my image view. as u can see i comment out the ns log in the imagedidtapped method. it works til that point. however when i tried to navigate it out to another page it fails.
- (void)viewDidLoad
{
UITapGestureRecognizer *tapRecognizer;
[testing setTag:0];
[testing setUserInteractionEnabled:TRUE];
tapRecognizer = [[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imageViewDidTapped:)] autorelease];
tapRecognizer.numberOfTapsRequired = 1;
[testing addGestureRecognizer:tapRecognizer];
[self.view addSubview:testing];
[testing release];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)imageViewDidTapped:(UIGestureRecognizer *)aGesture {
UITapGestureRecognizer *tapGesture = (UITapGestureRecognizer *)aGesture;
UIImageView *tappedImageView = (UIImageView *)[tapGesture view];
switch (tappedImageView.tag) {
case 0:
//NSLog(#"UIImageView 1 was tapped");
[self navigate];
break;
case 1:
NSLog(#"UIImageView 2 was tapped");
break;
default:
break;
}
}
-(void)navigate
{
TestViewController *testviewcontroller = [[TestViewController alloc]initWithNibName:nil bundle:nil];
[self.navigationController pushViewController:testviewcontroller animated:YES];
}
The problem is that by default userInteractionEnabled is NO for a UIImageView so you won't get any touches. Set it to YES.
Also the message handling for touchesBegan is really complicated. You'll be much happier if you attach a UITapGestureRecognizer to the image view.
EDIT: Now you say your touches handling is working, but the navigation is not taking place. So let's concentrate on this part of your code:
-(void)navigate
{
TestViewController *testviewcontroller = [[TestViewController alloc]initWithNibName:nil bundle:nil];
[self.navigationController pushViewController:testviewcontroller animated:YES];
}
Put logging in there to make sure navigate is being called! If it isn't being called, you need to figure out why your other code is not running and calling it. If it is being called, then the problem is probably that self.navigationController is nil, i.e. you are not inside a navigation interface to start with.
I have an application with UIScrollView added as a subview of UIView. i have added UITextField,UITextview as a subView of UIScrollView .I want to dismiss the keyboard when i tap in the scroll view. how can i do this?
Just add UITapGestureRecognizer
- (void)viewDidLoad
{
[super viewDidLoad];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(singleTapGestureCaptured:)];
[scr addGestureRecognizer:singleTap];
}
- (void)singleTapGestureCaptured:(UITapGestureRecognizer *)gesture
{
//Get touch point
CGPoint touchPoint=[gesture locationInView:scr];
//Hide keyBoard
[self.view endEditing:YES];
}
In iOS 7, you can achieve this easily.
scrollView.keyboardDismissMode = UIScrollViewKeyboardDismissModeInteractive;
Try this,
- (void)viewDidLoad
{
[super viewDidLoad];
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(dismissKeyboard)];
tapGesture.cancelsTouchesInView = NO;
[scrollView addGestureRecognizer:tapGesture];
[tapGesture release];
}
-(void)dismissKeyboard
{
[txtNotes resignFirstResponder];
[textView resignFirstResponder];
}
When I added the gesture to a subclass of UIScrollView, I was having problems with the various gestures in my view tree interfering with each other, such as being able to click on subviews, scroll the view, and have the keyboard dismiss in all cases. I came up with this solution, which can be setup from a superclass of UIScrollView or from a UIViewController.
The DismissKeyboardTapGesture class uses ARC, works with any text fields under the view, and doesn't take over any clicks from subviews like buttons. Also takes advantage of iOS7 scrolling effect to dismiss keyboard.
Setting up from UISScrollView superclass:
_dismissKeyboard = [[DismissKeyboardTapGesture alloc] initWithView:self];
or from UIViewController:
_dismissKeyboard = [[DismissKeyboardTapGesture alloc] initWithView:self.view];
Here is the class:
#interface DismissKeyboardTapGesture : NSObject <UIGestureRecognizerDelegate>
#end
#implementation DismissKeyboardTapGesture
- (id)initWithView:(UIView *)view
{
self = [super init];
if (self) {
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(singleTap:)];
singleTap.cancelsTouchesInView = NO;
singleTap.delegate = self;
[view addGestureRecognizer:singleTap];
if ([view respondsToSelector:#selector(setKeyboardDismissMode:)]) {
// Bonus effect to dismiss keyboard by scrolling
((UIScrollView *)view).keyboardDismissMode = UIScrollViewKeyboardDismissModeInteractive;
}
}
return self;
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
// Don't stop any existing gestures in our view from working
if (otherGestureRecognizer.view == gestureRecognizer.view) {
return YES;
}
return NO;
}
- (void)singleTap:(UIGestureRecognizer*)gestureRecognizer
{
// Close keyboard for any text edit views that are children of the main view
[gestureRecognizer.view endEditing:YES];
}
#end
I'm attempting to implement a tap-gesture recognizer on a UIImageView. However I can't get the method that handles the tap event to fire. I've compared my code against the answers to many similar questions on stackoverflow but still the problem persists. Below is the relevant code from my application. Can someone show me what I've done wrong?
ViewController.h
IBOutlet UIImageView *topLeftImage;
-(IBAction)handleSingleTap:(UITapGestureRecognizer*)gestureView;
ViewController.m
- (void)viewDidUnload
{
[super viewDidUnload];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
topLeftImage.userInteractionEnabled = YES;
[topLeftImage addGestureRecognizer:singleTap];
}
- (void)handleSingleTap:(UITapGestureRecognizer *)gestureRecognizer {
NSLog(#"Tap detected. Booyah!");
}
Try this instead. You put your code in viewDidUnload, completely the wrong place. You want viewDidLoad.
- (void)viewDidLoad
{
[super viewDidLoad];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleSingleTap:)];
topLeftImage.userInteractionEnabled = YES;
[topLeftImage addGestureRecognizer:singleTap];
}
I cant seem to push this view controller and I must be doing something wrong. Code
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
button = [UIButton buttonWithType:UIButtonTypeCustom];
[button addTarget:self action:#selector(pushToStart) forControlEvents:UIControlEventTouchUpInside];
}
- (void)pushToStart
{
ViewController *view = [[ViewController alloc]init];
[[self navigationController] pushViewController:view animated:YES];
}
What am I doing wrong?
Create a UINavigationController programatically, or do it using Interface Builder - There are 100's of tutorials online on how to do this. For example here
So, another EXC_BAD_ACCESS topic on StackOverflow, but as I'm new to Objective-C this is still a topic I don't really grasp yet. Even though I have done a lot of research about it already.
The issue is the following. I have a UIScrollView that I have overwritten using a Custom Class (named MultiSelectView). If the user taps this UIScrollView and then I want to open a view that allows him to select some data.
So I have declared a UITapGestureRecognizer that calls the openMultiSelect: method. But on the line [parent.navigationController pushViewController:view animated:YES]; I get a Program received signal: "EXC_BAD_ACCESS". error. Why o why?
- (id) initWithCoder:(NSCoder *) coder {
self = [super initWithCoder: coder];
if (self) {
// Add a Tap Gesture Recognizer to the Scrollview.
// If the user taps the view, it triggers the 'openMultiSelect' method.
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(openMultiSelect:)];
[singleTap setNumberOfTapsRequired:1];
[singleTap setNumberOfTouchesRequired:1];
[self addGestureRecognizer:singleTap];
}
return self;
}
- (void)openMultiSelect:(UIGestureRecognizer *)gesture {
//int myViewTag = gesture.view.tag; // now you know which view called
DataSelectView *view = [[DataSelectView alloc] initWithNibName:#"DataSelectView" bundle:[NSBundle mainBundle]];
view.allowMultiSelect = YES;
[parent.navigationController pushViewController:view animated:YES];
[view release];
}
So the parent that you see is a ViewController that contains the tab. Is there a better way to do this? Because for now I have thus a ViewController that contains Tabs. In its activateTab: method I thus create the tab and pass self along. I do the same in the viewDidLoad for that tab to pass the parent to the custom UIScrollView:
- (void) activateTab:(int)index {
... code ...
self.tab_Basic = [[TabBasic alloc] initWithNibName:#"TabBasic" bundle: [NSBundle mainBundle]];
self.tab_Basic.parent = self;
... code ...
}
You should make some change to your callback method. Something like that:
- (void)openMultiSelect:(UIGestureRecognizer *)gesture {
//int myViewTag = gesture.view.tag; // now you know which view called
if(gesture.state == UIGestureRecognizerStateEnded){
DataSelectView *view = [[DataSelectView alloc] initWithNibName:#"DataSelectView" bundle:[NSBundle mainBundle]];
view.allowMultiSelect = YES;
[parent.navigationController pushViewController:view animated:YES];
[view release];
}
}
What you are doing wrong is releasing the object "view" too early, don't release it until the view is popped. That should fix the problem.
- (void)openMultiSelect:(UIGestureRecognizer *)gesture {
//int myViewTag = gesture.view.tag; // now you know which view called
DataSelectView *view = [[DataSelectView alloc] initWithNibName:#"DataSelectView" bundle:[NSBundle mainBundle]];
view.allowMultiSelect = YES;
[parent.navigationController pushViewController:view animated:YES];