Open Radar

 
Summary:
Setting the progress of a UIProgressView doesn't work in iOS 9 using either the "progress" property or "- setProgress:animated:". No matter what, the progress of the UIProgressView will always be 0.0.

Steps to Reproduce:
1. Using Xcode 7 (7A120f), Create a UIProgressView in Storyboard and connect it to code. Deployment target is iOS9.
2. Try to change the UIProgressView's progress by modifying the "progress" property or using "- setProgress:animated:" in viewDidLoad.
3. Run the project in the iOS 9 simulator.

Expected Results:
UIProgressView should show the new progress when the view loads. For example, if the code says "[self.testProgressView setProgress:1.0 animated:YES];" then the progress view should be completely filled.

Actual Results:
If "animated:" is set to "NO," then the progress view starts at the correct progress when the view loads, but then quickly animates down to 0.0. If "animated:" is set to "YES," then the same thing happens, but the progress view itself also incorrectly animates its own size and position.

Version:
Xcode 7 (7A120f) running on OS X 10.11

Notes:
This issue is not entirely present in iOS 8.3. Setting "animated:" to "YES" is still somewhat buggy, but setting "animated:" to "NO" works perfectly in iOS 8.3.