Open Radar

 
Summary:
When using UIASlider's dragToValue function, the thumb of the slider jiggles and goes to the wrong value (see this GIF: http://maxgabriel.github.io/images/uiasliderBug2.gif ) note how when the value is set to 1 the slider actually ends up at ~0.8.

Steps to Reproduce:
1. Unzip the attached sample project and open the .xcodeproj (or else clone the repo here https://github.com/MaxGabriel/UIASliderBug)
2. Select the iOS 7 simulator (I used retina 4 inch, 32 bit)
3. Run Instruments (command+I) and choose the Automation template
4. From the scripts area of the left sidebar, choose 'import' and choose the UIAutomationScript.js file (included in the zip or in the repo)
5. Press the 'run/record' button in the top left

Expected Results:
The slider smoothly slides to the given values in the script.

Actual Results:
The slider jiggles when sliding to some values, and ends at the incorrect value.

Version:
Xcode Version 5.1.1 (5B1008)
Instruments Version 5.1.1 (55045)
OS X 10.9.2 Build 13C1021

Notes:
This is possibly a duplicate of http://openradar.appspot.com/15723925 but I am unable to confirm because the mentioned videos look to have been included in the original Radar, but not in the OpenRadar report.

Configuration:
The `dragToValue` function works correctly on iOS 6. I have replicated the problem on iOS 7 and 7.1

Of note is that sometimes the function works—note in the attached/linked GIF that it slides to 0.9 correctly, but fails to slide to 0.5 or 1.0 correctly. Potentially it only has problems with some values? However, I am able to replicate it using the value 1.0 every time.

Attachments:
'uiasliderBug2.gif' and 'TestSlider.zip' were successfully uploaded. // The gif is available at the link above, and the sample project is in the github repo above.