LaunchScreen.storyboard
在LaunchScreen.storyboard中拖拽imageView并設置約束，勾選右側Use as launch Screen
工程—General—App Icons and Launch Images選項中設置Launch Screen File為所制作的LaunchScreen.storyboard或者LaunchScreen.xib
Assets.xcassets
設置LaunchImage
準備:
各種尺寸啟動圖：640 × 960，640 × 1136玖绿，750 × 1334屏轰，1242 × 2208阐污，（橫平需要2208 ×1242）
iPhone Portrait iOS5,6(1x:320 × 480 pixels, 2x:640 × 960 pixels, Retina 4:640 × 1136 pixels)
iPhone Portrait iOS8,9(Retina HD 5.5”:1242 × 2208 pixels, Retina HD 4.7”:750 × 1334 pixels)
iPhone Landscape iOS 8,9(Retina HD 5.5”:2208 × 1242 pixels)
iPhone Portrait iOS7,9(2x:640 × 960 pixels, Retina 4:640 × 1136 pixels)
iPhone X Portrait? iOS 11+ (3x:1125 x 2436 pixels)
配置
工程—General—App Icons and Launch Images選項中設置Launch Image Source 為LaunchImage
取消勾選Use as Launch Screen
置空路徑Launch Screen File
