应用图标
过渡动画
删除项目中LaunchScreen.storyboard选择App Icons and Launch Images->Launch Screen File选择空－>Launch Images Source点击Use Asset Catalog->在弹出的对话框中选择migrate 此时在assets.xcassets中会自动生成一个LaunchImage,将其删除，单击右键选择App Icons and Launch Images－>New iOS Launch images 4.将图片拖进Launch image中进行相应的配置如图：
