在iOS 8/9中根据设备方向更改视图控制器
在iOS 8/9中根据设备方向更改视图控制器
提问于 2015-07-17 00:44:35
在iOS 8/9中，基于设备方向在两个视图控制器之间进行排序的首选方式是什么？我想要建立一个仪器，在风景中展示。在肖像中，我想显示应用程序的设置。
回答 2
Stack Overflow用户
发布于 2015-07-17 01:03:54
在"didFinishLaunchingWithOptions“函数内的AppDelegate.swift中，我放入：
NSNotificationCenter.defaultCenter().addObserver(self, selector: "rotated", name: UIDeviceOrientationDidChangeNotification, object: nil)然后在AppDelegate类中放入以下函数：
func rotated(){
if(UIDeviceOrientationIsLandscape(UIDevice.currentDevice().orientation){
println("landscape")
}
if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation)){
println("Portrait")
}
}或者，您可以使用以下命令：
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
if UIDevice.currentDevice().orientation.isLandscape.boolValue {
println("landscape")
} else {
println("portraight")
}
}Stack Overflow用户
发布于 2015-09-19 15:03:27
这是我为iOS 9创建的机制，但这也应该适用于iOS 8。
import UIKit
extension CGSize {
static func minMaxSize(size: CGSize) -> CGSize {
return CGSize(width: size.minValue(), height: size.maxValue())
}
static func maxMinSize(size: CGSize) -> CGSize {
return CGSize(width: size.maxValue(), height: size.minValue())
}
func minValue() -> CGFloat {
return min(self.width, self.height)
}
func maxValue() -> CGFloat {
return max(self.width, self.height)
}
}
extension UIScreen {
func isPortrait() -> Bool {
return self.bounds.width < self.bounds.height
}
}
class BaseViewController: UIViewController {
var horizontalConstraints = [NSLayoutConstraint]()
var verticalConstraints = [NSLayoutConstraint]()
private lazy var _isPortrait: Bool = UIScreen.mainScreen().isPortrait()
func isPortrait() -> Bool {
if let parentViewController = self.parentViewController as? BaseViewController {
return parentViewController.isPortrait()
}
return _isPortrait
}
override func loadView() {
self.view = UIView()
}
override func viewDidLoad() {
super.viewDidLoad()
self.addViewController()
self.addLayoutGuides()
self.setupLayoutGuides()
self.addSubViews()
self.setupSubViews()
}
func addViewController() {
/* override point */
}
func addLayoutGuides() {
/* override point */
}
func setupLayoutGuides() {
/* override point */
}
func addSubViews() {
/* override point */
}
func setupSubViews() {
/* override point */
}
private func applyConstraints() {
self.willApplyConstraints()
self.isPortrait() ? self.applyVerticalConstrains() : self.applyHorizontalConstrains()
self.didApllyedConstraints()
}
func willApplyConstraints() {
/* override point */
}
func applyVerticalConstrains() {
/* override point */
}
func applyHorizontalConstrains() {
/* override point */
}
func didApllyedConstraints() {
/* override point */
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
if let superView = self.view.superview {
if superView.isKindOfClass(UIWindow.self) && self.parentViewController == nil {
if CGSize.minMaxSize(size) == CGSize.minMaxSize(UIScreen.mainScreen().bounds.size) {
_isPortrait = size.width < size.height
}
}
}
super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
self.applyConstraints()
}
}至少我假设子viewController永远不会接触继承的私有_isPortrait，因为它是lazy。只有rootViewController的顶级视图才能设置此属性。超级viewWillTransitionToSize函数在检查完成后调用。因此，如果在rootViewController上设置了该值，则所有子viewController在调用其viewWillTransitionToSize函数时都将具有正确的值。这是必须要做的，因为你不能依赖于子viewController视图的大小，但至少你可以信任你的‘`rootViewController’，如果它是全屏的。希望这能以某种方式帮助到某个人。
所以我的RootViewController现在可能是这样的。
class RootViewController: BaseViewController {
override func addViewController() {
/* add child view controller here so they can receive callbacks */
}
override func addSubViews() {
/* add your subviews here in a way you like so you can play with AutoLayout as you wish */
}
override func setupSubViews() {
/* setup up your views here and always activate vertical constraints here */
/* because iOS will always initialize in portrait even if launched in landscape */
/* deactivate your horizontal constrains and put them inside the array */
/* add vertical constraints to the vertical array; other constraints can be active */
/* without the need to be added somewhere */
}
override func willApplyConstraints() {
/* deactivate all constrains */
NSLayoutConstraint.deactivateConstraints(self.verticalConstraints)
NSLayoutConstraint.deactivateConstraints(self.horizontalConstraints)
}
override func applyVerticalConstrains() {
NSLayoutConstraint.activateConstraints(self.verticalConstraints)
}
override func applyHorizontalConstrains() {
NSLayoutConstraint.activateConstraints(self.horizontalConstraints)
}
override func didApllyedConstraints() {
/* force layouting if needed */
self.view.layoutIfNeeded()
}
}更新(Xcode7-OSX10.11.1beta)：用于iPad测试的使用iPad 2或iPad视网膜模拟器，因为Air 1/2与AutoLayout断开。所有模拟器都将生成以下消息：<CATransformLayer: 0x790af320> - changing property masksToBounds in transform-only layer, will have no effect
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原文链接：
https://stackoverflow.com/questions/31460049
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