控制檯打印：
App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.
嘗試解決方法：
來自
http://www.cocoachina.com/bbs/read.php?tid-307066-keyword-xcode7.html
https://developer.apple.com/library/prerelease/ios/releasenotes/General/WhatsNewIniOS/Articles/iOS9.html#//apple_ref/doc/uid/TP40016198-DontLinkElementID_13
在iOS9 beta1中，蘋果將原http協議改成了https協議，使用 TLS1.2 SSL加密請求數據。
解決辦法：
在info.plist中添加
<key>NSAppTransportSecurity</key><dict>
<key>NSAllowsArbitraryLoads</key>
<true/></dict>
