我目前正在调整我的应用程序以与新的iOS 13功能兼容。我在Firebase Remote Config中存储了一些颜色值，用于浅色和深色模式，我想根据用户的设置使用它们，但是当我访问traitCollection的属性时，模拟器在禁用暗模式时崩溃。启用暗模式后，一切都很好。
我该如何解决这个问题？
根据我对阅读Apple文档的理解，默认模式是浅色，所以我想我可以创建一个简单的if语句来要求启用暗模式。您可以在下面看到代码中的方法。它在我的视图控制器的内部视图加载中调用：
func renderCustomUI() {
var primaryColor = UIColor()
var secondaryColor = UIColor()
if #available(iOS 13.0, *) {
// crash !
if traitCollection.userInterfaceStyle == .dark {
primaryColor = UIFunctions.shared.getPrimaryColor(darkMode: true)
secondaryColor = UIFunctions.shared.getSecondaryColor(darkMode: true)
}
} else {
primaryColor = UIFunctions.shared.getPrimaryColor(darkMode: false)
secondaryColor = UIFunctions.shared.getSecondaryColor(darkMode: false)
}
let navBar = navigationController?.navigationBar
navBar?.barTintColor = primaryColor
navBar?.tintColor = secondaryColor
self.refreshControl.tintColor = primaryColor
let homeButton = self.navigationItem.leftBarButtonItem!
homeButton.setIcon(icon: .ionicons(.iosInformationOutline), iconSize: CGFloat(IconSizes.navBarIcon.rawValue)+3, color: secondaryColor)
pastEventsSegment.tintColor = primaryColor
// set border bottom of nav bar to color
self.navigationController?.setNavigationBarBorderColor(primaryColor)
setupFont(color: secondaryColor)
}
public func getPrimaryColor(darkMode: Bool) -> UIColor {
var color = UIColor()
var primaryColorHex = ""
if darkMode {
primaryColorHex = RemoteConfig.remoteConfig()
.configValue(forKey: "primaryColorDark")
.stringValue ?? ""
} else {
// light mode and previous iOS versions
primaryColorHex = RemoteConfig.remoteConfig()
.configValue(forKey: "primaryColorDefault")
.stringValue ?? ""
}
color = self.hexStringToUIColor(hex: primaryColorHex)
return color
}
我希望我可以以这种方式对暗模式做出反应，任何其他情况都将使用我的应用程序的默认颜色，这相当于浅色模式。iOS 13 以下的设备也会获得默认颜色。
2019-09-23 12:51:20.449882+0200 Kaerwaradar[6231:311159] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -isEqual: not defined for the UIColor <UIPlaceholderColor: 0x60000272f5a0>; need to first convert colorspace.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff23b98bde __exceptionPreprocess + 350
1 libobjc.A.dylib 0x00007fff503b5b20 objc_exception_throw + 48
2 CoreFoundation 0x00007fff23b98a1c +[NSException raise:format:] + 188
3 UIKitCore 0x00007fff46d5a397 raiseWithColorSpaceError + 96
4 UIKitCore 0x00007fff46d5a3f9 -[UIColor isEqual:] + 9
5 UIKitCore 0x00007fff467e09fc -[UINavigationBar setBarTintColor:] + 59
6 Kaerwaradar 0x0000000107e57a92 $s11Kaerwaradar18HomeViewControllerC14renderCustomUIyyF + 1266
7 Kaerwaradar 0x0000000107e52649 $s11Kaerwaradar18HomeViewControllerC11viewDidLoadyyF + 1033
8 Kaerwaradar 0x0000000107e5321b $s11Kaerwaradar18HomeViewControllerC11viewDidLoadyyFTo + 43
9 UIKitCore 0x00007fff46af87c2 -[UIViewController _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 83
10 UIKitCore 0x00007fff46afd6d3 -[UIViewController loadViewIfRequired] + 1084
11 UIKitCore 0x00007fff46a6208c -[UINavigationController _updateScrollViewFromViewController:toViewController:] + 160
12 UIKitCore 0x00007fff46a6238c -[UINavigationController _startTransition:fromViewController:toViewController:] + 140
13 UIKitCore 0x00007fff46a63256 -[UINavigationController _startDeferredTransitionIfNeeded:] + 868
14 UIKitCore 0x00007fff46a645c1 -[UINavigationController __viewWillLayoutSubviews] + 150
15 UIKitCore 0x00007fff46a45ffb -[UILayoutContainerView layoutSubviews] + 217
16 UIKitCore 0x00007fff47636722 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2478
17 QuartzCore 0x00007fff2b030ef9 -[CALayer layoutSublayers] + 255
18 QuartzCore 0x00007fff2b0358ff _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 517
19 QuartzCore 0x00007fff2b041fe4 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 80
20 QuartzCore 0x00007fff2af8a4a8 _ZN2CA7Context18commit_transactionEPNS_11TransactionEd + 324
21 QuartzCore 0x00007fff2afbfab3 _ZN2CA11Transaction6commitEv + 643
22 UIKitCore 0x00007fff4717a1e1 __34-[UIApplication _firstCommitBlock]_block_invoke_2 + 81
23 CoreFoundation 0x00007fff23afb8ec __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
24 CoreFoundation 0x00007fff23afb058 __CFRunLoopDoBlocks + 312
25 CoreFoundation 0x00007fff23af5ee4 __CFRunLoopRun + 1284
26 CoreFoundation 0x00007fff23af56b6 CFRunLoopRunSpecific + 438
27 GraphicsServices 0x00007fff3815cbb0 GSEventRunModal + 65
28 UIKitCore 0x00007fff47162a67 UIApplicationMain + 1621
29 Kaerwaradar 0x0000000107e14d1b main + 75
30 libdyld.dylib 0x00007fff5123bcf5 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
在 iOS 13 灯光模式下颜色设置不正确。
if #available(iOS 13.0, *) {
let isDark = traitCollection.userInterfaceStyle == .dark
primaryColor = UIFunctions.shared.getPrimaryColor(darkMode: isDark)
secondaryColor = UIFunctions.shared.getSecondaryColor(darkMode: isDark)
} else {
primaryColor = UIFunctions.shared.getPrimaryColor(darkMode: false)
secondaryColor = UIFunctions.shared.getSecondaryColor(darkMode: false)
}