Apple this week seeded a trio of betas to registered developers, the most important of which being iOS 7.1 Build 11D5099e.
As the first iOS 7.1 build handed for testing purposes, 11D5099e is said to fix network connection issues. It also includes new burst mode upload options, though this change is not documented in the official changelog.
Speaking of which, a person with access to the iOS 7.1 beta has handed me a portion of the release notes where Apple discusses known issues and various bug fixes. Without further ado...
iOS SDK Release Notes for iOS 7.1 beta
[...]
Notes and Known Issues
The following issues relate to using iOS SDK 7.1 to develop code.
Bluetooth
Known Issue
32-bit apps running on a 64-bit device cannot attach to BTServer.
CFNetwork
Fixed in iOS 7.1 beta
Previously, if the server-side closed an HTTP request with TCP FIN without sending any bytes of HTTP header or HTTP body, NSURLConnection would synthesize an empty HTTP/1.1 200 OK response. This is now fixed, and the request will result in an error instead of a successful load with a synthesized response.
Notes
A new compatibility behavior has been added to address an issue where some web servers would send the wrong Content-Length value for “Content-Encoding: gzip” content. Previously, NSURLConnection and NSURLSession would send a “network connection was lost” / NSURLErrorNetworkConnectionLost (-1005) error in this situation.
The compatibility behavior applies only if the Content-Length value exactly matches the expanded gzip’d content. It won’t apply for “off by 1” or similar miscounting.
Core Text
Fixed in iOS 7.1 beta
Previously, text drawn with CTFrameDraw did not correctly place lines to account for the paragraphSpacing attribute of NSParagraphStyle. This has been addressed in iOS 7.1 beta.
Crash Logs
Known Issue
Crash logs will not appear in Diagnostics & Usage Data in Settings. The logs will still be available when synced off the device.
GLKit
Fixed in iOS 7.1 beta
If loaded with GLKTextureLoader, pngcrush images that have alpha were not unpremultiplied.
High Precision Timers
Fixed in iOS 7.1 beta
When sleeping or waiting for extremely precise time intervals, timers were delayed by up to 1 millisecond.
iTunes
Known Issue
Loading an iTunes Match library (or your purchased music history) may take much longer than expected, especially on larger libraries. If your library does not sync right away, please wait 30 minutes and try to access it again.
Multipeer Connectivity
Fixed in iOS 7.1 beta
The MCSessioninitWithPeer: method has now been implemented properly.
For more information on MCSession APIs, watch WWDC 2013: Nearby Networking with Multipeer Connectivity.
UIKit
Known Issues
If a UITextField or a UILabel that is baseline aligned with constraints has attributes that change after the constraints have been added, the layout may be incorrect. The exception to this is -setFont: on UILabel, which should work as expected.
Workaround: Avoid making changes in UITextField or UILabel after adding baseline-alignment constraints. If you must make changes, you should remove the constraints and then reapply them afterward. Note that this is a performance hit, so don’t do it unless it is necessary.
The backIndicatorTransitionMask from a storyboard or a xib will not be interpreted correctly at runtime.
Workaround: Set the backIndicatorTransitionMask in code.
