I need to implement the swipe gesture to specific limit.
I tried using the below code
UIView *viewLeftSwipe = [[UIView alloc] initWithFrame:CGRectMake(30, 200, 100, 50)];
viewLeftSwipe.backgroundColor = [UIColor whiteColor];
viewLeftSwipe.userInteractionEnabled = YES;
[self.view addSubview:viewLeftSwipe];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipe:)];
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[viewLeftSwipe addGestureRecognizer:swipeLeft];
But it is not calling the below method
- (void)handleSwipe:(UISwipeGestureRecognizer *)swipe
{
NSLog(#"Swipe");
}
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.
how can I change the UIView background colour by a SwipeGesture? e.g. Green for a Left Swipe and Red for a Right Swipe. Thank you very much.
code doesn't work:
- (void)viewDidLoad {
self.view.backgroundColor=[[UIColor alloc]initWithRed:24.0/255 green:96.0/255 blue:120.0/255 alpha:0.5];
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100.0, 100.0, 100.0, 100.0)];
[imageView setUserInteractionEnabled:YES];
[super viewDidLoad];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipe:)];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipe:)];
// Setting the swipe direction.
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
// Adding the swipe gesture on image view
[self.view addGestureRecognizer:swipeLeft];
[self.view addGestureRecognizer:swipeRight];
}
- (void)handleSwipe:(UISwipeGestureRecognizer *)swipe {
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
self.view.backgroundColor=[[UIColor alloc]initWithRed:138.0/255 green:24.0/255 blue:47.0/255 alpha:1.0];
NSLog(#"Left Swipe");
}
if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
self.view.backgroundColor=[[UIColor alloc]initWithRed:24.0/255 green:96.0/255 blue:120.0/255 alpha:1.0];
NSLog(#"Right Swipe");
}
}
You need to have separate swipe handler to make it work. This works great.
Your codes in setting up your UISwipeGestureRecognizer should look
like this.
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeRight:)];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipeLeft:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
imageView.userInteractionEnabled = YES;
// Adding the swipe gesture on image view
[imageView addGestureRecognizer:swipeRight];
[imageView addGestureRecognizer:swipeLeft];
And your swipe handle should be like this.
- (void)handleSwipeRight:(UISwipeGestureRecognizer *)swipe {
self.view.backgroundColor=[[UIColor alloc]initWithRed:24.0/255 green:96.0/255 blue:120.0/255 alpha:1.0];
}
- (void)handleSwipeLeft:(UISwipeGestureRecognizer *)swipe {
self.view.backgroundColor=[[UIColor alloc]initWithRed:138.0/255 green:24.0/255 blue:47.0/255 alpha:1.0];
}
Declare an imageView property in the interface of the ViewController file.
#property (weak, nonatomic) UIImageView *imageView;
- (void)viewDidLoad
{
[super viewDidLoad];
self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(100.0, 100.0, 100.0, 100.0)];
[imageView setUserInteractionEnabled:YES];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipe:)];
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipe:)];
// Setting the swipe direction.
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[swipeRight setDirection:UISwipeGestureRecognizerDirectionRight];
// Adding the swipe gesture on image view
[self.imageView addGestureRecognizer:swipeLeft];
[self.imageView addGestureRecognizer:swipeRight];
}
Handling Swipe Gesture Events
//newImage and newImage1 are the images files name in your project or ImageAssets
- (void)handleSwipe:(UISwipeGestureRecognizer *)swipe {
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(#"Left Swipe");
self.view.backgroundColor = [UIColor greenColor];
self.imageView.image = [UIImage imageNamed: #"myNewImage.png"];
}
if (swipe.direction == UISwipeGestureRecognizerDirectionRight) {
NSLog(#"Right Swipe");
self.view.backgroundColor = [UIColor redColor];
self.imageView.image = [UIImage imageNamed: #"myNewImage1.png"];
}
}
Hope this helps. Happy Coding. refer to this SO Post
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;
}