适配ipad Pro

买了个新款ipad pro 11寸的，发现我们的ipad项目。 上下左右都有黑边

使用info.plist设置启动图，不用asset和launch storyboard

图片用如下格式命名，拖到项目中：

<key>UILaunchImages~ipad</key>
    <array>
        <dict>
            <key>UILaunchImageSize</key>
            <string>{, }</string>
            <key>UILaunchImageOrientation</key>
            <string>Landscape</string>
            <key>UILaunchImageName</key>
            <string>Default-iOS12-Landscape-1024h</string>
            <key>UILaunchImageMinimumOSVersion</key>
            <string>12.0</string>
        </dict>
        <dict>
            <key>UILaunchImageSize</key>
            <string>{, }</string>
            <key>UILaunchImageOrientation</key>
            <string>Landscape</string>
            <key>UILaunchImageName</key>
            <string>Default-iOS12-Landscape-834h</string>
            <key>UILaunchImageMinimumOSVersion</key>
            <string>12.0</string>
        </dict>
        <dict>
            <key>UILaunchImageSize</key>
            <string>{, }</string>
            <key>UILaunchImageOrientation</key>
            <string>Landscape</string>
            <key>UILaunchImageName</key>
            <string>Default-iOS11-Landscape-834h</string>
            <key>UILaunchImageMinimumOSVersion</key>
            <string>11.0</string>
        </dict>
        <dict>
            <key>UILaunchImageMinimumOSVersion</key>
            <string>7.0</string>
            <key>UILaunchImageName</key>
            <string>Default-iOS7-Landscape</string>
            <key>UILaunchImageOrientation</key>
            <string>Landscape</string>
            <key>UILaunchImageSize</key>
            <string>{, }</string>
        </dict>
    </array>

------下面的解决办法不是很完美，launch screen file 的图片在不同尺寸的屏幕上可能会变形，还是使用上面info.plist的方式更好---------

解：

升级到最新版xcode:  Version 10.1 (10B61)

不使用launch image作为启动图，

使用launch screen file作为启动图

搞定