iOS 开发常见问题

Application windows are expected to have a root view controller at the end of application launch

解决方案：

Xcode7.0 只需在AppDelega.m的didFinishLaunchingWithOptions添加
self.window.rootViewController = [[UIViewController alloc]init];

2. MPMoviePlayerController 在模拟器里调试，出现黑屏，无法播放视频。经查找，测试，发现和arc有关系。单个文件不用arc编译即可。

3. 用AVPlayer 或 MPMoviePlayerController 模拟器播放时，有时出现异常，各种查，应该是库的问题，去掉xcode上ALL Exceptions 断点即可。4. iOS 9 遇到 “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.”。解决方案：新特性要求App内访问网络请求，要采用 HTTPS 协议，如果需要访问HTTP协议：a. 在Info.plist中添加 App Transport Security Settings 类型 Dictionary ;b. 在 App Transport Security Settings 下添加 Allow Arbitrary Loads 类型Boolean ,值设为 YES;