iOS - UIScrollView from half to full screen - ios

Question

In a UIViewController, I have a UIScrollView that takes half of the screen. This UIScrollView contains a collection of UIView. On some specific event, such as a swipe, I want my UIScrollView to take full screen animatedly, how do I achieve this behavior?

Answer 1

Try this...
// adding swipe gesture to your scrollview
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:#selector(handleSwipe:)];
// Set swipe direction.
[swipeLeft setDirection:UISwipeGestureRecognizerDirectionLeft];
[scrollview addGestureRecognizer:swipeLeft];
// add gesture action method
- (void)handleSwipe:(UISwipeGestureRecognizer *)swipe {
// if you are having only one swipe gesture, you no need to add the below condition. you can add the code inside the condition
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
NSLog(#"Left Swipe");
scrollView.contentSize = self.view.frame;
scrollView.frame = self.view.frame;
}
}

Answer 2

Try using this method on event and set :
scrollView.contentSize = CGSizeMake(847, 800); // change on basis of your requirement
For animating scroll view :
- (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated; // animate at constant velocity to new offset

Answer 3

Quoting from #RAJA's answer and slight improvement:
[UIView beginAnimations:#"whatever" context:nil];
scrollView.contentSize = CGSizeMake(self.view.frame.size.width, self.view.frame.size.height * <count of subviews>);
scrollView.frame = self.view.frame;
[UIView commitAnimations];

Answer 4

I just extend the first answer, If you want animate the above process, you can achieve that by appending the following code :
- (void)handleSwipe:(UISwipeGestureRecognizer *)swipe
{
if (swipe.direction == UISwipeGestureRecognizerDirectionLeft)
{
[UIView animateWithDuration:0.15f // set duration for your animation here
animations:^{
scrollView.contentSize = self.view.frame;
scrollView.frame = self.view.frame;
}
completion:^(BOOL finished){
NSLog(#"completion block");
}];
}
}