I'm stuck at showing the uibutton *removeSticker, please help.
- (void)viewWillAppear:(BOOL)animated {
UIView *holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 50, _imagePicker.selectedImage.size.width, _imagePicker.selectedImage.size.height)];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:[holderView frame]];
[imageView setImage:_imagePicker.selectedImage];
[holderView addSubview:imageView];
removeSticker = [UIButton buttonWithType:UIButtonTypeCustom];
removeSticker.frame = CGRectMake(0, 0, 32, 32);
[removeSticker setImage:[UIImage imageNamed:#"cancel-disabled.png"] forState:UIControlStateNormal];
[removeSticker addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
[holderView addSubview: removeSticker];
[removeSticker setHidden: YES];
UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(scale:)];
[pinchRecognizer setDelegate:self];
[holderView addGestureRecognizer:pinchRecognizer];
UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotate:)];
[rotationRecognizer setDelegate:self];
[holderView addGestureRecognizer:rotationRecognizer];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(move:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[holderView addGestureRecognizer:panRecognizer];
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapped:)];
[tapRecognizer setNumberOfTapsRequired:1];
[tapRecognizer setDelegate:self];
[holderView addGestureRecognizer:tapRecognizer];
UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longPress:)];
[longPressRecognizer setDelegate:self];
[holderView addGestureRecognizer:longPressRecognizer];
[stickerView addSubview:holderView];
}
- (void)buttonClicked:(id)sender{
UIView *holderView = [(UIButton *)sender superview]; [holderView removeFromSuperview];
}
The uibutton *removeSticker only appears on the latest added uiview *holderView, if I want to edit the previously added once, nothing occurs. Please help, thanks a lot.
-(void)longPress:(id)sender {
[removeSticker setHidden:NO];
}
Please check the attached screenshot: http://i.stack.imgur.com/moMOj.png
For the screenshot above, bottle and watermelon are *holderView.
I've added the bottle first, and then added the watermelon afterwards, however when I click on the bottle, [removeSticker setHidden:NO]; shows up in the watermelon instead of the bottle.
[removeSticker setHidden:NO]; only shows up on the latest newly added *holderView.
From Apple's documentation:
"A view can have only one superview at the same time."
So if you add a view as a subview to another view, the subview will be removed from its previous superview and added to the new one. (see the addSubview method's documentation).
(consider thinking about why UIView has a single #property of type UIView *superview, and not an NSArray named superviews [in plural]).
Edit: if you actually want to have multiple views in multiple superviews, you'll have to create multiple instances of your UIView and add the multiple instances to the various superviews. You'll also want to take care of the corresponding UIView instances, so you may add them to an NSArray and manage that aeray using an NSDictionary.
Related
I have the following code:
m_singleView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, nWidth - 1, nHeight - 1)];
m_singleView.backgroundColor = [UIColor clearColor];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(pinch:)];
[pinchGesture setCancelsTouchesInView:YES];
[m_singleView addGestureRecognizer:pinchGesture];
[m_singleView setUserInteractionEnabled:YES];
[m_MainView addSubview:m_singleView];
The issue that I'm having is that the pinch event for some reason does not fire. However, if i change line from [m_singleView addGestureRecognizer:pinchGesture] to [m_MainView addGestureRecognizer:pinchGesture]; then everything will work fine... can I not add the event for subview only?
Thanks!
Yes,you can add gesture to subview. i tested your code like below works fine.
First add delegate.
#interface ViewController : UIViewController<UIGestureRecognizerDelegate>
- (void)viewDidLoad {
[super viewDidLoad];
UIView *m_singleView = [[UIView alloc] initWithFrame:CGRectMake(50, 50, self.view.frame.size.width - 50, self.view.frame.size.height - 50)];
self.view.backgroundColor=[UIColor greenColor];
m_singleView.backgroundColor = [UIColor redColor];
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(pinch)];
pinchGesture.delegate=self;
[pinchGesture setCancelsTouchesInView:YES];
[m_singleView addGestureRecognizer:pinchGesture];
[m_singleView setUserInteractionEnabled:YES];
[self.view addSubview:m_singleView];
}
-(void)pinch{
NSLog(#"In PInch");
}
you have used pinchgesture so you can use it like below.
Use Debug view hierarchy to see whether the size of m_singleView are 0 or not? If so, the size of m_singleView needs to be changed until you can touch it.
I'm setting a view on my UINavigationItem's touchView and adding a tap gesture recognizer to it. What's weird, is that the tap recognizer is getting called even when the tap is outside of the view. Any idea why this might be happening?
UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 120.0f, 20.0f)];
testView.backgroundColor = [UIColor redColor];
UIGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(doStuff:)];
tapRecognizer.cancelsTouchesInView = YES;
[testView addGestureRecognizer:tapRecognizer];
testView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
self.navigationItem.titleView = testView;
I can click outside the red box and still trigger the gesture recognizer.
use this way
UITapGestureRecognizer *tapRecognizer =
[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(doStuff:)];
instead of this code
UIGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(doStuff:)];
I have a horizontal scrollview filled with UIImageViews.
I want to detect a tap on the UIImageView and have its background color changed.
Somehow the tap gesture is not working or so.
However, when I add a tap gesture to the scrollview, it works. The scrollview.background color can be changed.
But I want to detect a tap on the UIImageViews it contains!
UIScrollView* scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 50, 768, 127)];
[scrollView setScrollEnabled:YES];
scrollView.backgroundColor = [UIColor orangeColor];
[scrollView setShowsHorizontalScrollIndicator:NO];
UIImageView *contentOfScrollView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 1, 1130, 125)];
scrollView.contentSize = CGSizeMake(contentOfScrollView.frame.size.width, contentOfScrollView.frame.size.height);
for (int aantal=0; aantal < 6; aantal++) {
UIImageView *item = [[UIImageView alloc] initWithFrame:CGRectMake(3+(aantal*188), 0, 185, 125)];
item.backgroundColor = [UIColor yellowColor];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:item action:#selector(imageTapped:)];
tap.numberOfTapsRequired = 1;
tap.cancelsTouchesInView=YES;
item.userInteractionEnabled = YES;
[item addGestureRecognizer:tap];
[contentOfScrollView addSubview:item];
}
//UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imageTapped:)];
//[scrollView addGestureRecognizer:tap];
scrollView.userInteractionEnabled=YES;
scrollView.delaysContentTouches=NO;
[scrollView addSubview:contentOfScrollView];
[self.view addSubview:scrollView];
And this is the imageTapped function.
-(void)imageTapped:(UITapGestureRecognizer *)gesture
{
NSLog(#"tapped!");
gesture.view.backgroundColor = [UIColor whiteColor];
}
User interaction is set to NO by default for UIImageView, so you need to set it to YES.
You set it to yes for "item", but not for contentOfScrollView.
Your error is here:
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:item action:#selector(imageTapped:)];
You need to change the target to "self" instead of "item", then it won't crash.
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imageTapped:)];
I'm stuck at how to declare the uibutton in uiview:
- (void)viewWillAppear:(BOOL)animated {
NSLog(#"Added holderView.");
UIView *holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 50, _imagePicker.selectedImage.size.width, _imagePicker.selectedImage.size.height)];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:[holderView frame]];
[imageView setImage:_imagePicker.selectedImage];
[holderView addSubview:imageView];
UIButton *removeSticker = [UIButton buttonWithType:UIButtonTypeCustom];
removeSticker.frame = CGRectMake(0, 0, 100, 100);
[removeSticker setImage:[UIImage imageNamed:#"cancel-disabled.png"] forState:UIControlStateNormal];
[removeSticker addTarget:self action:#selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
[holderView addSubview: removeSticker];
[removeSticker setHidden: YES];
UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(scale:)];
[pinchRecognizer setDelegate:self];
[holderView addGestureRecognizer:pinchRecognizer];
UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotate:)];
[rotationRecognizer setDelegate:self];
[holderView addGestureRecognizer:rotationRecognizer];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(move:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[holderView addGestureRecognizer:panRecognizer];
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapped:)];
[tapRecognizer setNumberOfTapsRequired:1];
[tapRecognizer setDelegate:self];
[holderView addGestureRecognizer:tapRecognizer];
UILongPressGestureRecognizer *longPressRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longPress:)];
[longPressRecognizer setDelegate:self];
[holderView addGestureRecognizer:longPressRecognizer];
[stickerView addSubview:holderView];
}
- (void)buttonClicked:(id)sender {
UIView *holderView = [(UIButton *)sender superview]; [holderView removeFromSuperview];
}
Here I want to make the uibutton *removeSticker visible to be able to do buttonClicked, however it said undeclared identifier *holderView:
-(void)longPress:(id)sender {
for(UIButton *removeSticker in holderView.subviews)[removeSticker setHidden: NO];
}
How should I write this line? Please help, thanks a lot.
Just this
-(void)longPress:(id)sender {
[removeSticker setHidden:NO];
}
The reason you get that error is that the scope for holderView is limited to the block it is declared in. For future reference, if you want it to have scope across your entire class, it should be an ivar or property.
You also want to make removeSticker an ivar for the same reason.
To make it an ivar, put the declaration in the header file:
UIButton *removeSticker;
Then in your viewWillAppear code you change this line
UIButton *removeSticker = [UIButton buttonWithType:UIButtonTypeCustom];
to this
removeSticker = [UIButton buttonWithType:UIButtonTypeCustom];
But barley has it right in his answer, too. sender is already pointing to the removeSticker object, whether you declare it as an ivar or not.
Try this.
-(void)longPress:(id)sender {
[(UIButton *)sender setHidden:NO];
}
In your original code, you are referencing a variable in different scope (i.e., holderView). Thats why the error.
I'm working on an OpenSource Magazine Engine that you can look at on GitHub:
https://github.com/interactivenyc/Defrag
I've set up a UIToolbar in a UIView I've called MenuPanel. For some reason the UIBarButtonItems in the UIToolbar aren't calling their actions properly. Here is the syntax I'm using for the buttons:
UIBarButtonItem *homeItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"home.png"] style:UIBarButtonItemStylePlain target:self action:#selector(buttonClicked:)];
What is happening is that anywhere I click on my screen, the UITapGestureRecognizer declared in my main UIViewController is being called instead. This gets setup in this block of code in my main UIViewController:
- (void)setupGestureRecognizers {
//NSLog(#"setupGestureRecognizer NEW");
UISwipeGestureRecognizer *swipeRecognizer;
swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)];
swipeRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swipeRecognizer];
[swipeRecognizer release];
swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)];
swipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeRecognizer];
[swipeRecognizer release];
swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)];
swipeRecognizer.direction = UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:swipeRecognizer];
[swipeRecognizer release];
swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleGesture:)];
swipeRecognizer.direction = UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:swipeRecognizer];
[swipeRecognizer release];
UITapGestureRecognizer *tapRecognizer;
tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
[self.view addGestureRecognizer:tapRecognizer];
[tapRecognizer release];
}
I'm sure I have something pretty basic conceptually wrong with how I'm trying to do this. Can someone tell me how I can fix this problem?
For reference, you can see my main DefragViewController: UIViewController here:
https://gist.github.com/1431722
And my MenuPanel: UIView here:
gist.github.com/1431728
I solved my own question.
I had to tell my UIViewController to ignore touches from any UIToolbar like this:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
//ignore any touches from a UIToolbar
if ([touch.view.superview isKindOfClass:[UIToolbar class]]) {
return NO;
}
return YES;
}