Xcode7 运行空白模版报错，将AppDelegate中改为
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
return YES;
}
并删除LaunchScreen.storyboard
并在plist中删除
原文：http://blog.csdn.net/bjourney/article/details/47711075