I have a viewController that holds WKWebView in his properties.
I made my viewController to implement UIScrollViewDelegate and in 'didScroll' put some code that wont let the scrollView scroll vertically.
like that:
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
scrollView.contentOffset = CGPointMake(scrollView.contentOffset.x, 0);
}
The disabling part is good I tried it on other scrollView and it works just fine.
I set the webView.scrollView delegate to be the viewController.
I also made a method that loop over all of the subViews of webView and if it comes across another scrollView it set the delegate of that scrollView to be the viewController.
After all that it still not working...
-(void)setDelegateForScrollViewsInView:(UIView *)view{
if (view.subviews.count > 0) {
for (UIView *subView in view.subviews){
if ([subView isKindOfClass:[UIScrollView class]]) {
[((UIScrollView *)subView) setDelegate:self];
[((UIScrollView *)subView) setShowsHorizontalScrollIndicator:false];
[((UIScrollView *)subView) setBackgroundColor:UIColor.blueColor];
}
[self setDelegateForScrollViewsInView:subView];
}
}I }
After View Debugger i found that my webView is build up in that hirarchy:
And my method cant catches the inside scrollView so the disabling of the vertical scroll won't work.
How can I fix it?
Related
I am having a (UIView and UICollectionView in a UIScrollView) as 1stVC. I have to scroll both at the same time for which I already unable the collection view scrolling. So first time When I launch that screen I am able to scroll the whole view, But when I push to (next ViewController) 2ndVC and then press Back Button to 1stVC my scroll view is not preforming it got Freeze.
Tried this Method:-
-(void)viewDidLayoutSubviews{
[super viewDidLayoutSubviews];
dispatch_async(dispatch_get_main_queue(), ^ {
CGRect contentRect = CGRectZero;
for(UIView *view in self.scrollView.subviews)
contentRect = CGRectUnion(contentRect,view.frame);
self.scrollView.contentSize = contentRect.size;
});
}
Tried this Method:-
-(void)viewDidLayoutSubviews{
[super viewDidLayoutSubviews];
[_scrollView setContentSize:CGSizeMake(_scrollView.frame.size.width, _scrollView.frame.size.height)];
}
And For Getting Dynamic Height of the Collection view I have Done This
CGFloat height = _collectionCompass.contentSize.height;
Which I Have provided to ScollView ContentSize.
_scrollView.contentSize = CGSizeMake(_scrollView.frame.size.width, height);
Please help me.
What I really suggest it's to remove scroll view and do all stuff in collection view, since with scroll view you're missing some of benefits (e.g. cells reusing). Also collection view in scroll view it's a bad practice.
From Apple style guide:
Don’t place a scroll view inside of another scroll view. Doing so creates an unpredictable interface that’s difficult to control.
If your UI as list, you can add view as header of collection view or as another cell. With this approach you can remove the code from viewDidLayoutSubviews
I have a SuperUITableView as the main superview; inside that superview, I have another UITableView called SubUITableView.
I want to pass the scrolling gesture from the subview (SubUITableView) to the superview (SuperUITableView)
If the question is not clear, kindly ask me anything in the comments instead of downvoting.
UITableViews will confirms to scrollViewDidScroll delegate.
Inside the delegate of inner tableView, you just programmically scroll super tableView.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
UIScrollView *parentScrollView = (scrollView == self.tableView1) ? self.tableView2 : self.tableView1;
[otherScrollView setContentOffset:[scrollView contentOffset] animated:NO];
}
I'm trying to implement the following hierarchy
-- UISCrollView
-- ContainerView
-- UITableView
Initially the UITableView scroll is disabled. When the UICollectionView reaches a particular contentOffset of the UIScrollView, I implement this :
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if (scrollView.contentOffset.y >= 140)
{
[scrollView setContentOffset:CGPointMake(0, 140) animated:NO];
}
}
All this works as intended, but now the UIScrollView is eating the scroll of the UITableView. The scroll of UITableView is erratic now and doesn't scroll properly. The scroll of UITableView happens only after 7-8 attempts and then it stops again.
What might be the reason of this behaviour? I tried setting myScrollView.scrollEnabled = NO inside scrollViewDidScroll and no luck.
You can delay the main scroll view's touch response, then the sub tableview (scrollview) can be scrolled correctly:
myScrollView.panGestureRecognizer.delaysTouchesBegan = YES;
I'm developing kind of UITextView copy with customizations. For now I need to implement selection cursors (see screenshot of original UITextView below)
As I discovered from Debug View Hierarchy Apple developers draw these dots on separate Window to avoid clipping, and when UIScrollView starts dragging they move these dots inside UITextView, when it stops dragging they move it back to separate window. The only problem with this approach is how can I detect when some of my TextView superview's are UIScrollView and they start/end scrolling? Setting delegate for each of UIScrollView-type superviews looks bad and will bring a lot of headache, cause I will need to manage several delegates if needed (and even detect there change). Any ideas?
/*
In your viewDidLoad or where ever you create the UITextView call this :[self checkParentViewOfTextView:textField];
*/
-(void)checkParentViewOfTextView:(UITextView*)txv {
if ([txv.superview isKindOfClass:[UIScrollView class]]) { // Check if the superview if UIScrollView
UIScrollView *superScroll =(UIScrollView*) txv.superview;
superScroll.delegate = self;// In order to call the delegate methods below
superScroll.tag = 5; // Set a tag to access the current scrollView at these delegate methods
}
}
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
//Any scrollView did begin scrolling
if (scrollView.tag == 5) {
//Actions for your scrollView
}
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
//Any scrollView did end scrolling
if (scrollView.tag == 5) {
//Actions for your scrollView
}
}
You can use the same scroll view delegate for all UIScrollViews.
scrollView1.delegate = self
scrollView2.delegate = self
etc...
Just implement the delegate methods and take different action if necessary for each scroll view. Either do this by referencing properties in the class or setting the tag.
func scrollViewDidScroll(scrollView: UIScrollView!) {
if scrollView.tag == 0 {
// Do stuff
} else {
// Do other stuff
}
}
I'm trying to figure out how much of the scroll view inside my UIPageViewController has been scrolled. I have the following code in the viewLoad that access the UIScrollView from UIPageViewController.
for (UIView *view in self.pageViewController.view.subviews)
{
if ([view isKindOfClass:[UIScrollView class]])
{
thisControl = (UIScrollView *)view;
}
}
So once I have the UIScrollView, called thisControl I would like to print how much has been scrolled by doing something like this:
NSLog (#"Scroll: %f",thisControl.contentOffset.x);
The problem, is that I don't really know where to put this line, or how print continuously how much has been scrolled.
Any idea?
Set the delegate to that controller(myScroll.delegate = self;) and then add this method:
- (void) scrollViewDidScroll: (UIScrollView *) scrollView
{
CGFloat y = scrollView.contentOffset.y;
NSLog(#"%f",y);
// some stuff
}