LaunchScreen.storyboard启动图适配--最新

//修改前

{
   "images" : [
     {
       "idiom" : "universal",
       "scale" : "1x"
     },
     {
       "idiom" : "universal",
       "scale" : "2x"
     },
     {
       "idiom" : "universal",
       "scale" : "3x"
     }
   ],
   "info" : {
     "version" : 1,
     "author" : "xcode"
   }
 }

//修改后

    {
      "images" : [
        {
          "idiom" : "iphone",
          "scale" : "1x"
        },
        {
          "idiom" : "iphone",
          "scale" : "2x"
        },
        {
          "idiom" : "iphone",
          "scale" : "3x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "retina4",
          "scale" : "1x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "retina4",
          "scale" : "2x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "retina4",
          "scale" : "3x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "736h",
          "scale" : "3x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "667h",
          "scale" : "2x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "2436h",
          "scale" : "3x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "2688h",
          "scale" : "3x"
        },
        {
          "idiom" : "iphone",
          "subtype" : "1792h",
          "scale" : "2x"
        }
      ],
      "info" : {
        "version" : 1,
        "author" : "xcode"
      }
    }