您必须提供一个可伸缩的图像,其中包含足够的数据,使其在所有分辨率中都可行.

此外,您可以利用@ 2x和@ 3x修饰符.
iPhone 6 plus将尝试加载@ 3x修饰符AFAIK.

作为最后的手段,如果启动屏幕xib不足够,您仍然可以使用UILaunchImages plist键,并指定最小版本8.0的映像.缺点是Xcode不会为您自动生成,因此您必须手动编写它们.还要记住,iPhone 6加上图像的修饰符是@ 3x

一个例子：

UILaunchImage = Default // This is for iOS 6,if you need it

UILaunchImages // iOS 7,8
- [0]
-   UILaunchImageName = Default
-   UILaunchImageMinimumOSVersion = 7.0
-   UILaunchImageSize = {320,480}
-   UILaunchImageOrientation = Portrait
- [1]
-   UILaunchImageName = Default-568h
-   UILaunchImageMinimumOSVersion = 7.0
-   UILaunchImageSize = {320,568}
-   UILaunchImageOrientation = Portrait
- [2]
-   UILaunchImageName = Default-667h
-   UILaunchImageMinimumOSVersion = 8.0
-   UILaunchImageSize = {375,667}
-   UILaunchImageOrientation = Portrait
- [3]
-   UILaunchImageName = Default-736h
-   UILaunchImageMinimumOSVersion = 8.0
-   UILaunchImageSize = {414,736}
-   UILaunchImageOrientation = Portrait

附：上面的plist也是为图像目录或启动屏幕文件本地化而努力的人的完美解决方案.