I have a custom UIScrollView class that implements the touchesEnded method. My project has a storyboard, and I am trying to call the performSeguewithIdentifier on the viewcontroller but when I call the method changePhoto it gives me the error below. I have verified that my segue is labeled correctly, it is not misspelled. It looks like when I am creating the new instance of the PhotoViewController it doesnt create any of the storyboard and/or the segues. What can I do to call to get the segue to work properly from my UIScrollView?
CustomUIScrollView.m
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
if ([[touch view] isKindOfClass:[UIImageView class]]) {
UIView *imageView = [touch view];
NSInteger tag = imageView.tag;
NSLog(#"Tag: %d", tag);
PhotoViewController *vc = [[PhotoViewController alloc]init];
[vc changePhoto:1];
}
}
PhotoViewController.m
-(void)changePhoto:(int)spaceId {
[self performSegueWithIdentifier: #"photoSegue" sender: self];
}
Error:
2012-10-09 10:28:38.765 Spaces[82945:11303] * Terminating app due to
uncaught exception 'NSInvalidArgumentException', reason: 'Receiver
() has no segue with identifier
'photoSegue''
Try initializing you view controller with this
PhotoViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:#"myIdentifier"]
Be sure to set the identifier of the according view controller in the interface builder.
Related
I have following view hierarchy: navigation controller, inside it I pushed another view controller which contains UITableView with custom UIButtons in the cells. I have another view controller (MyCustomViewController2), which I want to show above all this stuff with animation.
But I am confused with this hierarchy and I don't know how to overwrite - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event method in my custom UIButton class. The code that I've come so far is:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
MyCustomViewController2 *myVC = [[UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:#"MyVC"];
[self.window addSubview: myVC.view];
}
But it's so bad! And I don't have any animations and I should delete it to remove. What can I try next?
It's highly recommended not to subclass a UIButton. So I wouldn't.
But since UIButton is a subclass of UIControl, you can use this method directly:
- (void)addTarget:(id)target
action:(SEL)action
forControlEvents:(UIControlEvents)controlEvents
Example in code could look like this:
[self.myButton addTarget:self action:#selector(showOtherVC) forControlEvents: UIControlEventTouchUpInside];
This will look at the target (self) for a particular method (showOtherVC) when the user lifts their finger from the button.
You could then have the current View Controller present the new one modally using this UIViewController method as example:
-(void)showOtherVC
{
MyCustomViewController2 *myVC = [[UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:#"MyVC"];
[self presentViewController:myVC animated:true completion:nil];
}
Read more on UIControl here:
UIControl Documentation
And check out other UIViewController modal transition styles here:
UIViewController Documentation
I recently came across an issue where I had a superview that needed to be swipable and a subview that also needed to be swipable. The interaction was that the subview should be the only one swiped if the swipe occurred within its bounds. If the swipe happened outside of the subview, the superview should handle the swipe.
I couldn't find any answers that solved this exact problem and eventually came up with a hacky solution that I thought I'd post if it can help others.
Edit:
A better solution is now marked as the right answer.
Changed title from "Ignore touch events..." to "Ignore gestures..."
If you are looking for a better solution, you can use gestureRecognizer:shouldReceiveTouch: delegate method to ignore the touch for the parent view recognizer.
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldReceiveTouch:(UITouch *)touch{
UIView* swipeableSubview = ...; //set to the subview that can be swiped
CGPoint locationInSubview = [touch locationInView:swipeableSubview];
BOOL touchIsInSubview = [swipeableSubview pointInside:locationInSubview withEvent:nil];
return !touchIsInSubview;
}
This will make sure the parent only receives the swipe if the swipe does not start on the swipeable subview.
The basic premise is to catch when a touch happens and remove gestures if the touch happened within a set of views. It then re-adds the gestures after the gesture recognizer handles the gestures.
#interface TouchIgnorer : UIView
#property (nonatomic) NSMutableSet * ignoreOnViews;
#property (nonatomic) NSMutableSet * gesturesToIgnore;
#end
#implementation TouchIgnorer
- (id) init
{
self = [super init];
if (self)
{
_ignoreOnViews = [[NSMutableSet alloc] init];
_gesturesToIgnore = [[NSMutableSet alloc] init];
}
return self;
}
- (BOOL) pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
CGPoint relativePt;
for (UIView * view in _ignoreOnViews)
{
relativePt = [view convertPoint:point toView:view];
if (!view.isHidden && CGRectContainsPoint(view.frame, relativePt))
{
for (UIGestureRecognizer * gesture in _gesturesToIgnore)
{
[self removeGestureRecognizer:gesture];
}
[self performSelector:#selector(rebindGestures) withObject:self afterDelay:0];
break;
}
}
return [super pointInside:point withEvent:event];
}
- (void) rebindGestures
{
for (UIGestureRecognizer * gesture in _gesturesToIgnore)
{
[self addGestureRecognizer:gesture];
}
}
#end
I am making a game like Flappy Bird. How do I present a UIViewController from SKScene?
First of all, I tell my environments
Mac OS X 10.9
Xcode 5.0.2
Sprite Kit(framework), social.framework(framework) are added in my project
My goal is to display a "Share" button upon Game Over. Tapping the share button image should present a SLComposeViewController (Twitter Share). The contents of the scene should not change.
I'd like to solve bellow issue and change display from GameOverScene to tweetSheet(display)
composed with social.framework.
The issue
[self presentViewController:tweetSheet animated:YES completion:nil];
//Error:No visible #interface for 'GameOverScene' declares the selector "presentViewController":animated:completion:
My coding files are below(I extracted parts of important codes).
ViewController.h
import <UIKit/UIKit.h>
import <SpriteKit/SpriteKit.h>
import <iAd/iAd.h>
#interface ViewController : UIViewController<ADBannerViewDelegate><br>
#end
GameOverScene.h
#import <SpriteKit/SpriteKit.h>
#class SpriteViewController;
#interface GameOverScene : SKScene {
}
#end
GameOverScene.m
#import "GameOverScene.h"
#import "NewGameScene.h"
#import "MainScene.h"
#import <Social/Social.h>
#implementation GameOverScene {
//The twitter button
SKSpriteNode *_twitterbutton;
}
- (id)initWithSize:(CGSize)size
{
if (self = [super initWithSize:size]) {
//Creating the twitterbutton with the twitterbutton image from Images.xcassets
_twitterbutton = [SKSpriteNode spriteNodeWithImageNamed:#"twitterbutton"];
[_twitterbutton setSize:CGSizeMake(50, 50)];
[_twitterbutton setPosition:CGPointMake(self.size.width/2, self.size.height/5 + 50)];
//Adding the twitter button
[self addChild:_twitterbutton];
//Again, this is important, otherwise we can't identify what button is pressed
_twitterbutton.name = #"twitterbutton";
[_twitterbutton setPosition:CGPointMake(self.size.width/2, self.size.height/5 + 50)]
}
return self;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
//Same as in NewGameScene menu
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
SKNode *node = [self nodeAtPoint:location];
//Is the twitter button touched?
if([node.name isEqualToString:#"twitterbutton"]){
if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter]){
SLComposeViewController *tweetSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
[tweetSheet setInitialText:#"TestTweet from the Game !!"];
[self presentViewController:tweetSheet animated:YES completion:nil];
**//Error:No visible #interface for 'GameOverScene' declares the selector "presentViewController":animated:completion:**
}
}
ViewControlloer.m
#import "ViewController.h"
#import "NewGameScene.h"
#implementation ViewController
//Loads the view onto our main class
- (void)loadView
{
self.view = [[SKView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame]];
}
//Executes when view finishes loading
- (void)viewWillLayoutSubviews
{
[super viewDidLoad];
//Set the resize mode to flexible width and height
[self.view setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
//Create our view from our original view
//Make sure to leave originalContentView in, otherwise the app will crash
SKView *skView = (SKView *)self.originalContentView;
//We create a new NewGameScene according to the current dimensions
SKScene *scene = [NewGameScene sceneWithSize:skView.bounds.size];
//Create a transition class with animation type fade and a duration of .4 seconds
SKTransition *transition = [SKTransition fadeWithDuration:.4];
//Present the menu view (NewGameScene) with our fade in transition
[skView presentScene:scene transition:transition];
}
#end
You cannot present a viewController from within a SKScene as it is actually only being rendered on a SKView. You need a way to send a message to the viewController, which in turn will present the viewController. For this, you can use delegation.
Add the following protocol definition to your SKScene's .h file:
#protocol sceneDelegate <NSObject>
-(void)showShareScreen;
#end
And declare a delegate property in the interface:
#property (weak, nonatomic) id <sceneDelegate> delegate;
Then, at the point where you want to present the share screen, instead of the line:
[self presentViewController:tweetSheet animated:YES completion:nil];
Use this line:
[self.delegate showShareScreen];
Now, in your viewController's .h file, implement the protocol:
#interface ViewController : UIViewController <sceneDelegate>
And, in your .m file, add the following line before you present the scene:
scene.delegate = self;
Then add the following method there:
-(void)presentShareScreen
{
if ([SLComposeViewController isAvailableForServiceType:SLServiceTypeTwitter])
{
SLComposeViewController *tweetSheet = [SLComposeViewController
composeViewControllerForServiceType:SLServiceTypeTwitter];
[tweetSheet setInitialText:#"TestTweet from the Game !!"];
[self presentViewController:tweetSheet animated:YES completion:nil];
}
}
An alternate method would be to use NSNotificationCenter
Keep the -presentShareScreen method as described in the previous alternative.
Add the viewController as a listener to the notification in it's -viewDidLoad method:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(presentShareScreen) name:#"showShareScreen" object:nil];
Then, in the scene at the point where you want to show this viewController, use this line:
[[NSNotificationCenter defaultCenter] postNotificationName:#"showShareScreen" object:nil];
How do I get a reference to the UIViewController of a touched view?
I am using a UIPanGestureRecognizer on the view of a UIViewController. Here's how I initialize it:
TaskUIViewController *thisTaskController = [[TaskUIViewController alloc]init];
[[self view]addSubview:[thisTaskController view]];
UIPanGestureRecognizer *panRec = [[UIPanGestureRecognizer alloc]initWithTarget:self action:#selector(handlePan:)];
[[thisTaskController view] addGestureRecognizer:panRec];
In the tiggered action triggered using the gesture recognizer I am able to get the view from the parameter using recognizer.view
- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer {
UIView *touchedView = [[UIView alloc]init];
touchedView = (UIView*)[recognizer view];
...
}
However what I really need is the underlying UIViewController of the view touched. How can I get a reference to the UIViewController that contains this view instead of only the UIView?
I would say that it is more a design issue than just getting a reference. So I would follow several simple advises:
Owner should catch events from its view. I.e. TaskUIViewController sould be a target to UIPanGestureRecognizer which you added to its view.
If a controller has a sub-controller and waits from its sub-controller some responses - implement this as delegate.
You have memory leak in your "handlePan:" method.
Here is a skeleton to solve your issue:
#protocol CallbackFromMySubcontroller <NSObject>
- (void)calbackFromTaskUIViewControllerOnPanGesture:(UIViewController*)fromController;
#end
#interface OwnerController : UIViewController <CallbackFromMySubcontroller>
#end
#implementation OwnerController
- (id)init
{
...
TaskUIViewController *thisTaskController = [[TaskUIViewController alloc] init];
...
}
- (void)viewDidLoad
{
...
[self.view addSubview:thisTaskController.view];
...
}
- (void)calbackFromTaskUIViewControllerOnPanGesture:(UIViewController*)fromController
{
NSLog(#"Yahoo. I got an event from my subController's view");
}
#end
#interface TaskUIViewController : UIViewController {
id <CallbackFromMySubcontroller> delegate;
}
#end
#implementation TaskUIViewController
- (id)initWithOwner:(id<CallbackFromMySubcontroller>)owner
{
...
delegate = owner;
...
}
- (void)viewDidLoad
{
UIPanGestureRecognizer *panRec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(handlePan:)];
[self.view addGestureRecognizer:panRec];
[panRec release];
}
- (void)handlePan:(UIPanGestureRecognizer *)recognizer {
...
[delegate calbackFromTaskUIViewControllerOnPanGesture:self];
...
}
#end
[touchedView nextResponder] will return the UIViewController object that manages touchedView (if it has one) or touchedView's superview (if it doesn’t have a UIViewController object that manages it).
For more information, see the UIResponder Class Reference. (UIViewController and UIView are subclasses of UIResponder.)
In your case, since you happen to know that touchedView is your viewController's view (and not, for instance, a subview of your viewController's view), you can just use:
TaskUIViewController *touchedController = (TaskUIViewController *)[touchedView nextResponder];
In the more general case, you could work up the responder chain until you find an object of kind UIViewController:
id aNextResponder = [touchedView nextResponder];
while (aNextResponder != nil)
{
if ([aNextResponder isKindOfClass:[UIViewController class]])
{
// we have found the viewController that manages touchedView,
// so we break out of the while loop:
break;
}
else
{
// we have yet to find the managing viewController,
// so we examine the next responder in the responder chain
aNextResponder = [aNextResponder nextResponder];
}
}
// outside the while loop. at this point aNextResponder points to
// touchedView's managing viewController (or nil if it doesn't have one).
UIViewController *eureka = (UIViewController *)aNextResponder;
Im trying to write a simple program that takes 5 images and allows you to drag them from the bottom of the screen and snap them on to 5 other images on the top in any order you like. I have subclassed the UIImageView with a new class and added the touches began, touches moved and touches ended. Then on my main viewcontroller I place the images and set their class to be the new subclass I created. The movement works great in fact I am NSLogging the coordinates in the custom class.
Problem is I'm trying to figure out how to get that CGpoint info from the touches end out of the custom class and get it to call a function in my main view controller that has the image objects so i can test whether or not the image is over another image. and move it to be centered on the image its over (snap onto it).
here is the code in my custom class m file. MY view controller is basically empty with a xib file with 10 image views 5 of which are set to this class and 5 are normal image views..
#import "MoveImage.h"
CGPoint EndPoint;
#implementation MoveImage
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
startPoint = [[touches anyObject] locationInView:self];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
CGPoint newPoint = [[touches anyObject] locationInView:self.superview];
newPoint.x -= startPoint.x;
newPoint.y -= startPoint.y;
CGRect frm = [self frame];
frm.origin = newPoint;
[self setFrame:frm];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *end = [[event allTouches] anyObject];
EndPoint = [end locationInView:self];
NSLog(#"end ponts x : %f y : %f", EndPoint.x, EndPoint.y);
}
#end
You could write a MoveImageDelegate protocol which your app controller would then implement. This protocol would have methods that your MoveImage class can call to get its information.
In your header file ( if you don't know how to write a protocol )
#protocol MoveImageDelegate <TypeOfObjectsThatCanImplementIt> // usually NSObject
// methods
#end
then you can declare an instance variable of type id, but still have the compiler recognize that that variable responds to your delegate selectors ( so you can code without those annoying warnings ).
Something like:
#interface MoveImage : UIImageView
{
id <MoveImageDelegate> _delegate;
}
#property (assign) id <MoveImageDelegate> delegate;
Lastly:
#implementation MoveImage
#synthesize delegate = _delegate;
And your delegate is complete.