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删除旧的LaunchImage
1.将其中一张启动图先丢到Assets.xcassets中，删除Assets.xcassets中的LaunchImage文件夹;
2.TARGETS -> General -> App Icons and Launch Images -> Launch Screen File -> LaunchScreen；
3.Build Settings -> Asset Catalog Launch Image Set Name删除LaunchImage。
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LaunchScreen.storyboard设置
1.在view上添加UIImageView
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2.给UIImageView添加image，并将Content mode设置为Aspect Fill
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3.设置UIImageView布局
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4.如果你发现启动时启动图没有占到状态栏，那么左侧选中View Controller Scene，把Extend Edges -> Under Top Bars勾选去掉，Transition Style设置为Cover Vertical，Presentation设置为Full Screen
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