iOS 运行报错The app delegate must implement the window property if it wants to use a main storyboard ...

APP运行显示黑屏，console中报The app delegate must implement the window property if it wants to use a main storyboard file.

解决办法：

1、 在AppDelegate.h文件中添加代码：

@property (strong, nonatomic) UIWindow * window;

AppDelegate.h

2、在AppDelegate.m文件中添加代码：

@synthesize window = _window;

AppDelegate.m