Drag UIImageView images using UITouch Methods - ios

Question

I have a UITableViewCell with UIImageViews embedded. I understand it's not common practice but I'm using the UITouch methods to accomplish horizontal swipes. I retrieve images from a url/api . The issue is I wish to drag one image at a time from either left to right. The problem is, when i drag my finger on across the imageView, all loaded images slide through quickly. I want to focus on one image at a time during the drag. Hope I was clear.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
startLocation = [[touches anyObject] locationInView:self];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
CGPoint point = [[touches anyObject] locationInView:self];
UITouch * touch = [touches anyObject];
self.viewOne.center = CGPointMake(self.viewOne.center.x+point.x - startLocation.x, self.viewOne.center.y);
if (startLocation.x < point.x) {
//Swipe Right
if ([self.photo.photoURLS isKindOfClass:[NSArray class]]) {
if (self.isSwiping == NO) {
self.isSwiping = YES;
self.currentImage--;
if (self.currentImage == -1) {
self.currentImage = 12;
}
self.viewBack.frame = CGRectMake(-self.frame.size.width,0.0f, self.frame.size.width, self.frame.size.height);
self.viewBack.hidden = NO;
self.loadingImage.hidden = NO;
NSURL *imageURL = [[NSURL alloc] initWithString:self.photo.photoURLS[self.currentImage]];
[self asyncLoadImageFromURL:imageURL andPhotoID:self.photo.id withCallback:^(UIImage *image, NSString *photoID) {
self.loadingImage.hidden = YES;
[imageCache setImage:image forKey:self.photo.photoURLS[self.currentImage]];
self.viewBack.image = image;
//new
self.viewOne.frame = CGRectMake(0.0f, 0.0f, self.frame.size.width, self.frame.size.height);
self.viewOne.image = self.viewBack.image;
self.isSwiping = NO;
self.pageControl.currentPage = self.currentImage;
self.viewBack.hidden = YES;
}];
}
}
}
} else {
//Swipe Left
}
}

Answer 1

It's not entirely clear what you're asking or what the issue is, but the following lines are suspect:
CGPoint point = [[touches anyObject] locationInView:self.vehicleImage];
self.viewOne.center = CGPointMake(self.viewOne.center.x+point.x -startLocation.x, self.viewOne.center.y);
if (startLocation.x < endLocation.x)
You are not setting endLocation until after you've finished touching the screen. During your touchesMoved responder, you'll be using bad endLocation data. You should be using the value of point in this function to determine motion.
It's also not really clear what is the relationship between self.vehicleImage and self.viewOne. If self.vehicleImage is a subview of self.viewOne (or otherwise moves during your frame changes), your locationInView will return seemingly inconsistent values, exaggerating the motion of your finger. Instead, you should be picking a view that will stay static during this process (perhaps your ViewController's self.view).