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XCode10 swift4.2 适配遇到的坑

發布時間：2023/12/19 编程问答 34 豆豆

生活随笔收集整理的這篇文章主要介紹了 XCode10 swift4.2 适配遇到的坑小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

以下是2018年10月23日更新

經過大約一個月的時間的適配，項目正式使用XCode10(以下簡稱為10 or XC10)大部分庫都升級為Swift4.2（以下簡稱為 4.2 or S4.2），下面是適配過程中遇到的一些坑。

1. Swift4、Swift4.2混編

如果你對項目是小的獨立項目，完全可以全部升級為4.2，你可以略過第一條；如果你依賴了一些第三方的庫，且沒有升級4.2，你可以繼續看這一條。目前測試的結果來看，Swift4 和 S4.2的混編沒有什么大的問題，如果你是通過cocoapod引入的可以在Podfile中加入如下代碼：

2. NSDataAsset

升級XC10和S.2之前，項目里面有些對 'NSDataAsset' 的錯誤使用：用‘NSDataAsset’讀ImageAsset中的圖片，這個是不正確的，但是卻可以工作，這次升級修復了這個BUG。

正確的做法使用'DataAsset'，然后才可以用‘NSDataAsset’讀取數據，我由于不夠認真且經驗不足還以為是個BUG，給Apple提了個BUG。。。[捂臉]

3. 第三方庫的重命名 typealias

為了方便的適配S4.2對UIKit中的重命名，有些第三方使用typealias對一些類型進行了重命名，以 RxSwift 為例子，RxSwift中就有如下代碼：

#if swift(>=4.2)public typealias UIControlEvents = UIControl.Event private #endif 復制代碼

這會導致一些重命名的類型即使不改也不會報錯，但是一旦去掉了對某個庫的依賴就會引入新的問題。

4.Delegate 的 Access Modifier

在升級S4.2過程中，XC偶爾會提示需要給某些Delegate方法添加 private修飾符，不要為了消除這個??添加private，可能會導致Delegate永遠不被調到；另外，如果是一個public或者open的class，協議方法記得也要加上public，否則會出一樣的問題，具體原因我還在測試，但是現象是這樣的，有新的見解歡迎評論區討論。

5. 機型適配問題，iPhone XS Max字體變大

有些同事遇到XC9構建的安裝包在iPhone XS Max上會有字體變大的情況，這個貌似是普遍現象，微信也有，使用XC10構建安裝包可以解決這個問題，但是會遇到問題6

###6. iOS9.3以下系統Crash率飆升使用XC10構建安裝包可以解決問題5，但是iOS9.3以下的系統Crash到讓你懷疑人生

以下是2018年9月18日內容

AVAudioSession.sharedInstance().setCategory()

disappeared

Swift 4.2 中 iOS10以下不能用 AVAudioSession.sharedInstance() setCategory

可選方案:

使用OC實現該部分，然后使用Swift調用
放棄 iOS9用戶體驗

參考地址

do {if #available(iOS 11.0, *) {try audioSession.setCategory(.playback, mode: .default, policy: .longForm, options: [])} else if #available(iOS 10.0, *) {try audioSession.setCategory(.playback, mode: .default, options: [])} else {// Compiler error: 'setCategory' is unavailable in Swifttry audioSession.setCategory(AVAudioSession.Category.playback)} } catch let error {print("Unable to configure audio sesson category: \(error)") } 復制代碼

NSUnderlineStyle(.patternSolid、.none)

disappeared

可選方案:

.none

mutableAttributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.none.rawValue, range: range) ^~~~~ 'none' is unavailable: use [] to construct an empty option set

Wrong: mutableAttributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: [], range: range) Right: mutableAttributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: 0, range: range)

使用 CTUnderlineStyleModifiers

// 沒有測試 NSUnderlineStyle.init(rawValue: Int(CTUnderlineStyleModifiers.patternSolid.rawValue))
使用其他默認值

下面是Rename操作

UIKit

#Swift4/UIKit

UITableViewCell

Swift 4Swift 4.2

UITableViewCellStyle

UITableViewCell.CellStyle

UIEvent

Swift 4Swift 4.2

UIEventSubtype

UIEvent.EventSubtype

UITableView

Swift 4Swift 4.2

UITableViewScrollPosition	UITableView.ScrollPosition
UITableViewAutomaticDimension	UITableView.automaticDimension
UITableViewCellEditingStyle	UITableViewCell.EditingStyle
UITableViewRowAnimation	UITableView.RowAnimation
UITableViewStyle	UITableView.Style
UITableViewCellAccessoryType	UITableViewCell.AccessoryType

UIControl

Swift 4Swift 4.2

UIControlEvents

UIControl.Event

UIWindow

Swift 4Swift 4.2

UIWindowLevelAlert	UIWindow.Level.alert
UIKeyboardFrameEndUserInfoKey	UIResponder.keyboardFrameEndUserInfoKey
UIKeyboardFrameBeginUserInfoKey	UIResponder.keyboardFrameBeginUserInfoKey
UIKeyboardAnimationDurationUserInfoKey	UIResponder.keyboardAnimationDurationUserInfoKey
UIKeyboardAnimationCurveUserInfoKey	UIResponder.keyboardAnimationCurveUserInfoKey
UIKeyboardIsLocalUserInfoKey	UIResponder.keyboardIsLocalUserInfoKey
UIWindowDidBecomeVisible	UIWindow.didBecomeVisibleNotification
UIWindowDidBecomeHidden	UIWindow.didBecomeHiddenNotification
UIWindowDidBecomeKey	UIWindow.didBecomeKeyNotification
UIWindowDidResignKey	UIWindow.didResignKeyNotification
UIKeyboardWillShow	UIResponder.keyboardWillShowNotification
UIKeyboardDidShow	UIResponder.keyboardDidShowNotification
UIKeyboardWillHide	UIResponder.keyboardWillHideNotification
UIKeyboardDidHide	UIResponder.keyboardDidHideNotification

UIViewController

Swift 4Swift 4.2

open func addChildViewController(_ childController: UIViewController)	open func addChild(_ childController: UIViewController)
open func willMove(toParentViewController parent: UIViewController?)	open func willMove(toParent parent: UIViewController?)
open func didMove(toParentViewController parent: UIViewController?)	open func didMove(toParent parent: UIViewController?)
open func removeFromParentViewController()	open func removeFromParent()

UIActivity

Swift 4Swift 4.2

UIActivityType

UIActivity.ActivityType

UIActivityIndicatorView

Swift 4Swift 4.2

activityIndicator.activityIndicatorViewStyle

activityIndicator.style

UIAlertController

Swift 4Swift 4.2

UIAlertActionStyle	UIAlertAction.Style
UIAlertControllerStyle	UIAlertController.Style

UIPageViewController

Swift 4Swift 4.2

UIPageViewControllerNavigationDirection	UIPageViewController.NavigationDirection
UIPageViewControllerSpineLocation	UIPageViewController.SpineLocation
UIPageViewControllerNavigationOrientation	UIPageViewController.NavigationOrientation
UIPageViewControllerTransitionStyle	UIPageViewController.TransitionStyle
UIPageViewControllerOptionsKey	UIPageViewController.OptionsKey

UINavigationController

Swift 4Swift 4.2

UINavigationControllerOperation

UINavigationController.Operation

UIGestureRecognizer

Swift 4Swift 4.2

UIGestureRecognizerStatePossible	UIGestureRecognizer.State.possible
UIGestureRecognizerStateBegan	UIGestureRecognizer.State.began
UIGestureRecognizerStateChanged	UIGestureRecognizer.State.changed
UIGestureRecognizerStateEnded	UIGestureRecognizer.State.ended
UIGestureRecognizerStateCancelled	UIGestureRecognizer.State.cancelled
UIGestureRecognizerStateFailed	UIGestureRecognizer.State.failed
UIGestureRecognizerStateRecognized	UIGestureRecognizer.State.recognized

NSLayoutFormat

Swift 4Swift 4.2

NSLayoutFormatOptions

NSLayoutConstraint.FormatOptions

UIEdgeInsets

Swift 4Swift 4.2

public func UIEdgeInsetsMake(_ top: CGFloat, _ left: CGFloat, _ bottom: CGFloat, _ right: CGFloat) -> UIEdgeInsets	UIEdgeInsets(top: CGFloat, left: CGFloat, bottom: CGFloat, right: CGFloat)
public func UIEdgeInsetsInsetRect(_ rect: CGRect, _ insets: UIEdgeInsets) -> CGRect	public func inset(by insets: UIEdgeInsets) -> CGRect

UIFontDescriptor

Swift 4Swift 4.2

UIFontDescriptorSymbolicTraits

UIFontDescriptor.SymbolicTraits

UIImage

Swift 4Swift 4.2

UIKIT_EXTERN NSData * __nullable UIImagePNGRepresentation(UIImage * __nonnull image);	public func pngData() -> Data?
NSData * __nullable UIImageJPEGRepresentation(UIImage * __nonnull image, CGFloat compressionQuality);	public func jpegData(compressionQuality: CGFloat) -> Data?

UIApplication

Swift 4Swift 4.2

UIApplicationDidEnterBackground	UIApplication.didEnterBackgroundNotification
UIApplicationWillEnterForeground	UIApplication.willEnterForegroundNotification
UIApplicationDidFinishLaunching	UIApplication.didFinishLaunchingNotification
UIApplicationDidBecomeActive	UIApplication.didBecomeActiveNotification
UIApplicationWillResignActive	UIApplication.willResignActiveNotification
UIApplicationDidReceiveMemoryWarning	UIApplication.didReceiveMemoryWarningNotification
UIApplicationWillTerminate	UIApplication.willTerminateNotification
UIApplicationSignificantTimeChange	UIApplication.significantTimeChangeNotification
UIApplicationWillChangeStatusBarOrientation	UIApplication.willChangeStatusBarOrientationNotification
UIApplicationDidChangeStatusBarOrientation	UIApplication.didChangeStatusBarOrientationNotification
UIApplicationDidChangeStatusBarFrame	UIApplication.didChangeStatusBarFrameNotification
UIApplicationBackgroundRefreshStatusDidChange	UIApplication.backgroundRefreshStatusDidChangeNotification
UIApplicationProtectedDataWillBecomeUnavailable	UIApplication.protectedDataWillBecomeUnavailableNotification
UIApplicationProtectedDataDidBecomeAvailable	UIApplication.protectedDataDidBecomeAvailableNotification
UIApplicationUserDidTakeScreenshot	UIApplication.userDidTakeScreenshotNotification
UIApplicationOpenSettingsURLString	UIApplication.openSettingsURLString
UIApplicationLaunchOptionsKey	UIApplication.LaunchOptionsKey
UIInterfaceOrientationIsLandscape()	UIApplication.shared.statusBarOrientation.isLandscape

UIView

Swift 4Swift 4.2

func bringSubview(toFront view: UIView)	func bringSubviewToFront(_ view: UIView)
UIViewAnimationOptions	UIView.AnimationOptions()

Foundation

NSAttributedString

Swift 4Swift 4.2

NSAttributedStringKey

NSAttributedString.Key

QuartzCore

CAShapeLayer

Swift 4Swift 4.2

kCALineCapRound	CAShapeLayerLineCap.round
kCALineCapButt	CAShapeLayerLineCap.butt
kCALineCapSquare	CAShapeLayerLineCap.square
kCALineJoinMiter	CAShapeLayerLineJoin.miter
kCALineJoinRound	CAShapeLayerLineJoin.round
kCALineJoinBevel	CAShapeLayerLineJoin.bevel
kCAFillRuleNonZero	CAShapeLayerFillRule.nonZero
kCAFillRuleEvenOdd	CAShapeLayerFillRule.evenOdd

參考資料

Swift-Migration-4.2

轉載于:https://juejin.im/post/5ba0dfb9e51d450e4a1babcb

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