Swift3检测设备是否为iPadPortrait模式

检测设备方向变化, API变化真快, 讨论热烈.

http://stackoverflow.com/questions/25666269/ios8-swift-how-to-detect-orientation-change

起因是在看appcoda的那本iOS 10的书, 有个练习是在ipad(portrait)模式下修改某个stack view的spacing从10变成30.

看了一下,好像ipad不管怎么摆size classes都是wR/hR, 所以不能通过interface builder修改, 只能通过写代码的方式.

最终的我的代码如下(AppDelegate.swift):

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {// Override point for customization after application launch.NotificationCenter.default.addObserver(self, selector: #selector(rotated), name: NSNotification.Name.UIDeviceOrientationDidChange, object: nil)return true
}func rotated() {let isIPad &＃61; UIDevice.current.userInterfaceIdiom &＃61;&＃61; .padlet isPortrait &＃61; UIDeviceOrientationIsPortrait(UIDevice.current.orientation)print("isIPad: \(isIPad), iPortrait: \(isPortrait)")if isIPad {let controller &＃61; window!.rootViewController as! ViewControllercontroller.myStackView.spacing &＃61; isPortrait ? 30.0 : 10.0}
}


参考:

1. http://stackoverflow.com/questions/25666269/ios8-swift-how-to-detect-orientation-change
2. iOS Apprentice 5th edition
3. Beginning iOS programming with Swift