1、修改App-info.plist(在XCode中General中设置 一样的效果)
<key>UISupportedInterfaceOrientations</key>
<array>
<string>UIInterfaceOrientationPortrait</string>
</array>
2、AppDelegate中：
- (UIInterfaceOrientationMask)appl[......]
ios如何让启动页（闪屏页）强制竖屏，而进入App后允许横屏和竖屏
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