iOS7.1 beta4今早release了，翻了一下release note跟大家分享一下。
Bluetooth Known Issues
32-bit apps running on a 64-bit device cannot attach to BTServer.
已知問題32位元的app在iPhone 5S會有藍牙連線的問題，已經beta好幾版都沒有改= =+
CFNetwork Notes
A 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.
針對一些網站的 content encoding是 gzip情況下又給了錯誤的Content-Length，有提昇兼容性。
先前NSURLConnection跟NSURLSession會拿到 network connection was lost或是 NSURLErrorNetworkConnectionLost (-1005)的錯誤。
但兼容性的情況僅限於gzip的內容擴展後要與Content-Length一樣才可以。
Messages Fixed in iOS 7.1 beta 4
Messages no longer indicates a send failure immediately after sending.
這版看起來唯一有解掉的就是Message送出訊息不會馬上出現失敗的訊息。
Safari Notes
A property, minimal-ui, has been added for the viewport meta tag key that allows minimizing the top and bottom bars on the iPhone as the page loads. While on a page using minimal-ui, tapping the top bar brings the bars back. Tapping back in the content dismisses them again.
For example, use <meta name="viewport" content="width=1024, minimal-ui">.
meta標籤viewport新增了minimal-ui的屬性，讓Safari載入頁面時可以最小化上下狀態欄，點擊可以再次顯示/隱藏狀態欄。
UIKit Known Issues
Bar button background images are ignored in apps built and deployed to iOS7.1 when they are set using UIBarButtonItem setBackgroundImage:forState:style:barMetrics: with UIBarButtonItemStyleBordered as the style argument.
Workaround: Use UIBarButtonItemStylePlain or UIBarButtonItemStyleAny in this case, or use UIBarButtonItem setBackgroundImage:forState:barMetrics:.
Bar Button背景圖片在使用 setBackgroundImage:forState:style:barMetrics:中類型設定為UIBarButtonItemStyleBordered的時候會失效。
解決方法是設定成 UIBarButtonItemStylePlain或是 UIBarButtonItemStyleAny抑或是使用 setBackgroundImage:forState:barMetrics:
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.
UITextField跟UILabel如果設定了baseline aligned之後再設定其他屬性，這樣會使得layout錯誤。(除了UILabel設定字型是沒問題的)
目前要避免這樣的問題就是要調整先後順序，把baseline aligned放到最後設定。
The
backIndicatorTransitionMaskImage from a storyboard or a xib will not be interpreted correctly at runtime.
導航欄的按鈕圖案若是透過storyboard或是xib去設定的會無法作用，解決方法就是手動在code裡面設定
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