I want a UIImageView swipe left, the UIImageView will change the image, at this time, the pageController +1, if swipe right, the pageContoller -1, and display the previous image... ...How can I implement it? Any simple code? thz u.
Just attach a UISwipeGestureRecognizer to the UIImageView. When the gesture recognizer triggers, you would check it's direction and then change images and update the pageController accordingly.
UIGestureRecognizer *recognizer;
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(next:)];
UISwipeGestureRecognizer *swipeLeftRecognizer = (UISwipeGestureRecognizer *)recognizer;
swipeLeftRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:swipeLeftRecognizer];
swipeLeftRecognizer=nil;
[recognizer release];
recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(prev:)];
UISwipeGestureRecognizer *swipeRightRecognizer = (UISwipeGestureRecognizer *)recognizer;
swipeRightRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:swipeRightRecognizer];
swipeLeftRecognizer=nil;
[recognizer release];
Related
I added two uiimageviews, one on another subview uiview (imageview1,imageview2). In the first view the top uiimageview is hidden(imageview2) and in the second view the bottom imageview is hidden(imageview1).
Allocating tap gesture:
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(oneTap:)];
UITapGestureRecognizer *singleTap1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(oneTap:)];
Set user interaction for both uiimageview to YES.
[singleTap setNumberOfTapsRequired:1];
[singleTap1 setNumberOfTapsRequired:1];
// adding gesture to uiimageview
Add tap gesture recognizer and selector respectively.
[imageview1 addGestureRecognizer:singleTap];
[imageview2 addGestureRecognizer:singleTap1];
But my taps are not recognized.
Can any one tell me where the mistake is?
Try setting setUserInteractionEnabled:YES before adding gesture recognizer.
[imageview1 setUserInteractionEnabled:YES]
[imageview2 setUserInteractionEnabled:YES]
[imageview1 addGestureRecognizer:singleTap];
[imageview2 addGestureRecognizer:singleTap1];
Update:
After the comment you have made I suggest you bring your views to the top before detecting the tap event. Because parent imageView is above and catches these taps.
[yourparentview bringSubviewToFront:imageview1];
[yourparentview bringSubviewToFront:imageview2];
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(oneTap:)];
singleTap.numberOfTapsRequired = 1;
singleTap.numberOfTouchesRequired = 1;
singleTap.delegate = self;
[imageview1 addGestureRecogniser:singleTap];
[singleTap1 release];
imageview1.userInteractionEnabled = YES; //disabled by default
I have a button and I'm testing the taps on it, with one tap it change a background color, with two taps another color and with three taps another color again.
The code is:
- (IBAction) button
{
UITapGestureRecognizer *tapOnce = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapOnce:)];
UITapGestureRecognizer *tapTwice = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapTwice:)];
UITapGestureRecognizer *tapTrice = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapTrice:)];
tapOnce.numberOfTapsRequired = 1;
tapTwice.numberOfTapsRequired = 2;
tapTrice.numberOfTapsRequired = 3;
//stops tapOnce from overriding tapTwice
[tapOnce requireGestureRecognizerToFail:tapTwice];
[tapTwice requireGestureRecognizerToFail:tapTrice];
//then need to add the gesture recogniser to a view - this will be the view that recognises the gesture
[self.view addGestureRecognizer:tapOnce];
[self.view addGestureRecognizer:tapTwice];
[self.view addGestureRecognizer:tapTrice];
}
- (void)tapOnce:(UIGestureRecognizer *)gesture
{
self.view.backgroundColor = [UIColor redColor];
}
- (void)tapTwice:(UIGestureRecognizer *)gesture
{
self.view.backgroundColor = [UIColor blackColor];
}
- (void)tapTrice:(UIGestureRecognizer *)gesture
{
self.view.backgroundColor = [UIColor yellowColor];
}
The problem is that the first tap don't works, the other yes.
If I use this code without button it works perfectly.
Thanks.
If you want the colors to change on tap of button, you should add these gestures on button in viewDidLoad method or so rather than on the same button action. The above code will repeatedly add gestures on tap of the button to the self.view and not on button.
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer *tapOnce = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapOnce:)];
UITapGestureRecognizer *tapTwice = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapTwice:)];
UITapGestureRecognizer *tapTrice = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapTrice:)];
tapOnce.numberOfTapsRequired = 1;
tapTwice.numberOfTapsRequired = 2;
tapTrice.numberOfTapsRequired = 3;
//stops tapOnce from overriding tapTwice
[tapOnce requireGestureRecognizerToFail:tapTwice];
[tapTwice requireGestureRecognizerToFail:tapTrice];
//then need to add the gesture recogniser to a view - this will be the view that recognises the gesture
[self.button addGestureRecognizer:tapOnce]; //remove the other button action which calls method `button`
[self.button addGestureRecognizer:tapTwice];
[self.button addGestureRecognizer:tapTrice];
}
I have a bunch of imageview generated in a gridview. But now I want that each imageview can do a segue to another screen. Does anybody knows how I can do that? Here is the code of how I generated my imageview and put it into my grid.
UIImageView * myView = [[UIImageView alloc] initWithImage:myImage];
CGRect rect = myView.frame;
rect.origin.x = xCurrent;
rect.origin.y = yCurrent;
myView.frame = rect;
myView.tag = cellCounter;
[gridContainerView addSubview:myView];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
myView.userInteractionEnabled = YES;
[myView addGestureRecognizer:tap];
Please help
Kind regards
You are looking for a tapGestureRecognizer. Add one of those to your image views and make the action call your segue method.
UIImageView *img = [[UIImageView alloc] init];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(mySequeMethod:)];
img.userInteractionEnabled = YES;
[img addGestureRecognizer:tap];
A:
use a custom button instead of UIImageView, and set the image... and then segue with that button, (it looks the same)
B:
use a gesture recognizer to the view, and use a tap with one finger.
Currently I'm facing a problem, I would like to perform action when the UIImageView on my UITableViewCell had been tapped.
Question: How could I do it? Could any one show me the code, or any tutorial?
Thanks in advance!
This is actually easier than you would think. You just need to make sure that you enable user interaction on the imageView, and you can add a tap gesture to it. This should be done when the cell is instantiated to avoid having multiple tap gestures added to the same image view. For example:
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
if (self = [super initWithCoder:aDecoder]) {
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(myTapMethod:)];
[self.imageView addGestureRecognizer:tap];
[self.imageView setUserInteractionEnabled:YES];
}
return self;
}
- (void)myTapMethod:(UITapGestureRecognizer *)tapGesture
{
UIImageView *imageView = (UIImageView *)tapGesture.view;
NSLog(#"%#", imageView);
}
Try this
//within cellForRowAtIndexPath (where customer table cell with imageview is created and reused)
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleImageTap:)];
tap.cancelsTouchesInView = YES;
tap.numberOfTapsRequired = 1;
[imageView addGestureRecognizer:tap];
// handle method
- (void) handleImageTap:(UIGestureRecognizer *)gestureRecognizer
{
RKLogDebug(#"imaged tab");
}
make sure u have....
imageView.userInteractionEnabled = YES;
you can use a customButton instead UIImageView
A tap gesture recogniser can be very memory hungry and can cause other things on the page to break. I would personally reconmend you create a custom table cell, insert a button into the custom cell frame and in the tableview code set the self.customtablecell.background.image to the image you want. This way you can assign the button an IBaction to make it push to whatever view you want.
Use ALActionBlocks to action in block
__weak ALViewController *wSelf = self;
imageView.userInteractionEnabled = YES;
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithBlock:^(UITapGestureRecognizer *weakGR) {
NSLog(#"pan %#", NSStringFromCGPoint([weakGR locationInView:wSelf.view]));
}];
[self.imageView addGestureRecognizer:gr];
I am trying to make clickable UIImage, where the user can click it then it'll animate...
i am working with the UIScrollVIew that's why i used the UITapGesture instead of touchesBegan, and it seems that UIGestureRecognizer is not compatible with UIImage...
am i right?
i keep receiving this error message
receiver type 'UIImage' for instance message does not declare a method
with selector 'addGestureRecognizer'
is there any other way?
You have to add TapGesture in UIImageView not UIImage
imgView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapGesture1 = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapGesture:)];
tapGesture1.numberOfTapsRequired = 1;
[tapGesture1 setDelegate:self];
[imgView addGestureRecognizer:tapGesture1];
[tapGesture1 release];
You can response to the tap with the defined selector and do stuff there
- (void) tapGesture: (id)sender
{
//handle Tap...
}
You have to add the gesture to UIImageView, not UIImage
You can simply add a TapGestureRecognizer to a UIImageView. You have to use a UIImageView because gesture recognizer are only allowed to be added to views.
UIView *someView = [[UIView alloc] initWithFrame:CGRectZero];
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapAction:)];
tapRecognizer.numberOfTapsRequired = 1;
[someView addGestureRecognizer:tapRecognizer];
You can response to the tap with the defined selector and do stuff there
- (void)tapAction:(UITapGestureRecognizer *)tap
{
// do stuff
}
Try with UIButton instead of UIIMage and make the UIButton type custom. And on clicking the same you can show the animation.