问题：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.
原因：
从iOS9起，新特性要求App访问网络请求，要采用 HTTPS 协议。
解决办法：
1，在Info.plist中添加 App Transport Security Settings 类型 Dictionary ;
2，在 App Transport Security Settings 下添加 Allow Arbitrary Loads 类型Boolean ,值设为 YES;
