It’s possible to make and view a PHLivePhoto in the Playground from the elements of an actual Live Photo. In OS X’s Photos app, select a Live Photo and go to menu File > Export > Export original… It will create a .JPG and a .mov. Drop these two files in the Resources folder of … Read more
I found a workaround to force UIPageViewController to forget about cached view controllers of neighboring pages that are currently not displayed: pageViewController.dataSource = nil; pageViewController.dataSource = self; I do this everytime I change the set of pages. Of course this doesn’t affect the currently displayed page. With this workaround I avoid the caching bug and … Read more
The only difference is in where the view is added: whether it is the frontmost view (addSubview:), or it is before the 5th subview, (insertSubview:atIndex:) or if it is immediately behind another subview (insertSubview:aboveSubview:).
The back button belongs to the previous view controller, not the one currently presented on screen. To modify the back button you should update it before pushing, on the view controller that initiated the segue: override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { let backItem = UIBarButtonItem() backItem.title = “Something Else” navigationItem.backBarButtonItem = backItem // This … Read more
The reason is that SwiftUI ScrollView requires defined content size, but used UITextView is itself a UIScrollView and detects content based on available space in parent view. Thus it happens cycle of undefined sizes. Here is a simplified demo of possible approach how to solve this. The idea is to calculate content size of UITextView … Read more
Any code you put inside of viewDidLoad should be able to run multiple times with out any issues. If you have code that only needs to run once for your controller use -awakeFromNib. The reason is because the view of the view controller can be unloaded and loaded multiple times. The code inside of viewDidLoad … Read more
SwiftUI With a simple environment variable on the \.colorScheme key: struct ContentView: View { @Environment(\.colorScheme) var colorScheme var body: some View { Text(colorScheme == .dark ? “Its Dark” : “Its. not dark! (Light)”) } } UIKit As it described in WWDC 2019 – Session 214 around 23:30. As I expected, this function is getting called … Read more
UIKit is mostly NOT KVO compliant. This is mostly because UIView acts as high-level wrapper for CALayer, so when you eg. change the frame property of an UIView, it will change the layers frame but leave eg. the bounds property of the UIView untouched, so no observer will be triggered for the view.bounds path, because … Read more
I’ve implemented this method, but it requires paging enabled. Lets assume you have five elements A,B,C,D and E. When you set up your view, you add the last element to the beginning and the first element to the end, and adjust the content offset to view the first element, like this E,[A],B,C,D,E,A. In the UIScrollViewDelegate, … Read more
Edit: As far as I know, it’s not possible to use prototype UITableViewCells from a Storyboard anywhere other than the ViewController you created it in. I haven’t tried this with unit tests yet but you can easily put your custom UITableViewCell into a separate nib. For using it in your view controllers you need to … Read more