On my controller I have two UICollectionView instances and one UITableView instance. When tableView is on top of view hierarchy and I tap on status bar it does not scroll to top.
I've tried to set scrollsToTop property for collectionViews to NO. But tableView still doesn't scroll to top. Even more: collectionViews still scroll when I tap status bar.
I've gone further. I created a category on UIScrollView, where I swizzled -didMoveToWindow method like this:
- (void)swizzled_didMoveToWindow
{
[self swizzled_didMoveToWindow];
self.scrollsToTop = NO;
}
And it didn't work too! Scroll to top by tapping on status bar still works for all UICollectionView instances!
Please, tell me, what am I doing wrong?
Related
What is the best approach for attaching a UIButton on top of UIScrollView or UITableView so when the view is scrolled, the button stays in its place.
Here examples below:
UIButton stays in the right bottom corner when the view is scrolled.
google+ app example
yahoo mail app example
I think this should work. Lay Out your button in a view that is outside of the tableviewcontroller. Then drag an outlet to the tableviewcontroller file. Then add it in code. This code would hold it at the top of the screen.
#IBOutlet var buttonView: UIView!
override func viewDidLayoutSubviews() {
self.view.addSubview(buttonView)
}
override func scrollViewDidScroll(scrollView: UIScrollView) {
var rect = self.buttonView.frame
rect.origin.y = max(0,scrollView.contentOffset.y + scrollView.contentInset.top)
self.buttonView.frame = rect
}
Thank you all for great answers!
I got it worked through storyboard by moving the button from scrollView to View itself. That way it's attached on UIView and it's independent of scrollview.
storyboard snapshot
So now the structure is:
- View
- ScrollView
- Button
Before it was:
- View
- ScrollView
- Button
There are many ways to go about doing this but two that I use most often are as follows.
One approach is embedding the view controller within a navigation controller. This will set a bar on the top and bottom if you choose that you can place bar button items upon.
Another approach is to place a UIView along the top and snap the constraints to the left, right, and top with 0 no-margin. Then set the height. I usually use 40px for the height but you can use what is applicable to your needs. After that you can place a button in that UIView and then set constraints on it to keep in in place.
In my experience, this isn't reliably possible to do with the scrollView itself.
My solution is usually to put anything that needs to float above the tableView/scrollView in a plain ViewController that also contains the tableView/scrollView parent.
If you're using storyboards with a UITableViewController scene, this will likely mean you need to use another scene with UIViewController with a container that has your UITableViewController.
For UITableView use tableHeaderView. For UIScrollView you need to create a separate view not in the scroll view's hierarchy.
Another solution is to put your UIButton in a UIToolbar, and then make the toolbar a child of the UINavigationController's view. After that, in viewDidLayoutSubviews, you can set the rect of the toolbar to sit just below the navigation bar and offset the top of the UIScrollView or UITableView.
Add button which you want in the storyboard.
Design your scrollview
self.view.sendSubviewToBack(scrollViewObj)(in the code)
This worked for me.
I have a tableView in my app, and in Xcode I added the constraints to start at the beginning and finish at the bottom of the main view. However, the navigation bar and the tab bar hide the beginning and the footer of the tableView.
Do you know what I need to do to discount the size of these bars so the tableView shows properly?
Thank you.
Added this to my viewWillApper method:
//makes sure UITableView won't be under tob/bottom bars
if([self respondsToSelector:#selector(edgesForExtendedLayout)]) {
[self setEdgesForExtendedLayout:UIRectEdgeNone];
}
I have UISearchBar on my UITableView set as its tableViewHeader using InterfaceBuilder. I have hidden it under the UINavigationBar using
self.tableView.contentOffset = CGPointMake(0.0, self.searchBar.frame.size.height);
in my ViewWillAppear method. The problem is that if I go to the detailView and come back to this TableView, if the TableView has more than the screen visible cells, it works fine and hides the SearchBar as it is suppose to do, but if there are less than screen visible cells (i.e. tableview has 0 - 4 cells) then the SearchBar doesn't Hide.
Does anyone know why this is happening?
thanks in advance
I have a quite regular UIViewController that is a part of a UINavigationController-hierarchy, which naturally makes the view have a UINavigationBar at the top. As we all know, iOS7's navigation bars are very different from previous versions.
If I drag a UITableView into my view in Storyboard, then the 'frame' for the table view is covering the entire view (I.E [tableView setFrame:self.view.frame];). Even behind the NavigationBar.
This makes so that if I scroll, the content will be faintly visible through the bar.
Contrary to most people, I actually like this.
In my current view controller, I would like to create the UITableView programmatically and place it as a subview here. However, I am unable to achieve the same effect this way.
I have tried
UITableView *table = [[UITableView alloc] initWithFrame:self.view.frame];
[self.view addSubview: table];
This makes the 'top scrolling point' stay behind the navigation bar. Imagine a single cell in a tableView, and it's faintly visible through the top bar. If I scroll down, it pops right up behind it. That's the default 'top position'.
I have also tried
CGRect frame = CGRectMake(0, 'nav.y+nav.height', self...width, self...height-y);
UITableView *table = [[UITableView alloc] initWithFrame:frame];
[self.view addSubview: table];
to simply place the table view in the rect below the UINavigationBar, but then I won't get the scrolling transparency effect behind the bar.
I also tried the first example along with this:
[tableView setContentOffset:CGPointMake(0, 'below navbar')];
which makes it stay exactly where I want it to stay, but as soon as I touch it (scroll and release), it scrolls back up behind the navigation bar, and stays there.
What's the programmatic solution to achieve this effect? Do I have to set the offset every time I scroll too far up, or is there a simpler solution? Along with this iOS7-style, I'd imagine they would add something like [tableView setVisibleFrame:] or something..?
Add the table in storyboard like normal but make sure you have it connected to an outlet (we will call it _tableView for now).
Then in your view controller's -viewDidLoad set the top inset to be the status bar plus the navigation bar:
`self.tableView.contentInset = UIEdgeInsetsMake( (self.navigationController.navigationBar.frame.origin.y + self.navigationController.navigationBar.frame.size.height), 0, 0, 0);'
This will make sure that all of the cells will be visible but will also fill the area behind the navigation bar with white so the bar doesn't end up gray.
I don't know if this makes sense at all. I have UIScrollView from interface builder hooked it up as an outlet on top of my UIScrollView I have a UIImage view which holds an image called Scroll Background it is an extra half in screen real estate - my app is landscape and the image is an about half the screen taller. The image is hooked up as an outlet too. I have a button on a toolbar that brings up the keyboard when the button is pressed I'd like to programmatically scroll to the bottom of the UIImage view and when it is resigned I'd like to programmatically scroll to the top. I don't want the user to be able to scroll just for the app to scroll programmatically.
I can't seem to get this method to work and I'm not sure why :/
- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated
scrollRectToVisible:animated: is a non-intuative method to use in my opinion. In order to accomplish what you are after you should be able to set userInteractionEnabled to NO on the UIScrollView that will prevent users from scrolling.
Then in order to scroll the view programmatically you can call scrollRectToVisible but you need to give it a CGRect that is representative of the area you want to show. So in your case to scroll to the top:
CGRect visibleFrame = CGRectMake(0, 0, CGRectGetWidth(self.view.bounds) , CGRectGetHeight(self.view.bounds));
[self.myScrollView scrollRectToVisible:visibleFrame animated:YES];
Hope this helps!