LaunchScreen.storyboard设置启动页
1.打开Xcode,show the file inspector
2.关闭 use Safe Area Layout Guides
3.打开Use as Launch Screen
4.控制器添加一张UIImageView,添加约束 上下左右以superView为参考,取消constrain to margins,距离均为0
1.打开Xcode,show the file inspector
2.关闭 use Safe Area Layout Guides
3.打开Use as Launch Screen
4.控制器添加一张UIImageView,添加约束 上下左右以superView为参考,取消constrain to margins,距离均为0