👀 Views: 292 💬 Answers: 1 📅 Created: 2025-06-12

ios uikit scrollview performance swift

I'm trying to debug I'm relatively new to this, so bear with me. I'm facing a frustrating issue with a `UIScrollView` in my iOS app. I've implemented a simple scroll view that contains a number of child views, but on an iPhone 14 running iOS 16, the scrolling feels jittery and unresponsive. I've checked that the scroll view is set up correctly, but I'm not sure why it's not performing well. Here's a snippet of the set up code: ```swift let scrollView = UIScrollView(frame: self.view.bounds) scrollView.contentSize = CGSize(width: self.view.bounds.width, height: 1200) self.view.addSubview(scrollView) for i in 0..<10 { let label = UILabel(frame: CGRect(x: 0, y: i * 120, width: Int(self.view.bounds.width), height: 100)) label.text = "Label \(i)" label.backgroundColor = UIColor(hue: CGFloat(i) * 0.1, saturation: 1, brightness: 1, alpha: 1) scrollView.addSubview(label) } ``` Additionally, I've tried disabling the `clipsToBounds` property and ensuring that there are no heavy operations occurring during the scrolling. I've also set `scrollView.isPagingEnabled = false` and checked for any long-running tasks that might be causing the main thread to lag, but it still exhibits stuttering when I scroll. On running Instruments, I noticed that the CPU usage spikes during scroll interactions, and I receive the following warning in the console: ``` Warning: Scroll view goes beyond its bounds ``` I've looked into potential issues with Auto Layout constraints, but all the constraints seem straightforward. I’m using Xcode 14.1 with Swift 5.7. Any suggestions on how to improve the scrolling performance would be greatly appreciated! I'm working on a web app that needs to handle this. I'd really appreciate any guidance on this. I recently upgraded to Swift LTS. Cheers for any assistance!