我正在尝试为iOS13更新我的项目。我在应用程序项目中使用UIScrollSlidingPages库。
我将这个库放在我的UIViewController中，如下所示。我将自定义视图放在数据源中。
- (TTSlidingPage *)pageForSlidingPagesViewController:(TTScrollSlidingPagesController_Custom*)source atIndex:(int)index{
PhotoGalleryItemView *item = [[PhotoGalleryItemView alloc] initPhotoGalleryItem:[restaurantData.Galeri objectAtIndex:index] ParentViewController:self];
item.view.frame = _ViewPhotoContainer.frame;
TTSlidingPage *slidingPage = [[TTSlidingPage alloc] initWithContentViewController:item];
return slidingPage;
}
但是，当我运行该应用程序时，尽管我使用DispatchQueue Main Async like these solutions重新加载数据，它仍然崩溃。
2019-11-08 09:42:22.760428+0300 GastroClub[5790:35896] WARNING: GoogleAnalytics 3.17 void GAIUncaughtExceptionHandler(NSException *) (GAIUncaughtExceptionHandler.m:48): Uncaught exception: <PhotoGalleryItemView: 0x7f9eb1782db0> returned nil from -traitCollection, which is not allowed.
2019-11-08 09:42:22.925971+0300 GastroClub[5790:35896] invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution.
2019-11-08 09:42:22.988883+0300 GastroClub[5790:35896] *** Assertion failure in UITraitCollection * _Nonnull _UIGetCurrentFallbackTraitCollection(void)(), /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKitCore_Sim/UIKit-3900.12.15/_UIFallbackEnvironment.m:91
2019-11-08 09:42:22.990119+0300 GastroClub[5790:35896] *** WebKit discarded an uncaught exception in the webView:didFinishLoadForFrame: delegate: <NSInternalInconsistencyException> <PhotoGalleryItemView: 0x7f9eb1782db0> returned nil from -traitCollection, which is not allowed.
2019-11-08 09:42:27.776557+0300 GastroClub[5790:35896] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '<PhotoGalleryItemView: 0x7f9eb1782db0> returned nil from -traitCollection, which is not allowed.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff23c4f02e __exceptionPreprocess + 350
1 libobjc.A.dylib 0x00007fff50b97b20 objc_exception_throw + 48
2 CoreFoundation 0x00007fff23c4eda8 +[NSException raise:format:arguments:] + 88
3 Foundation 0x00007fff256c9c2a -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 166
4 UIKitCore 0x00007fff474abd67 _UIGetCurrentFallbackTraitCollection + 962
5 UIKitCore 0x00007fff47d00909 UIViewCommonInitWithFrame + 644
6 UIKitCore 0x00007fff47d00647 -[UIView initWithFrame:] + 98
7 UIKitCore 0x00007fff47cde48f -[UIImageView initWithFrame:] + 62
8 UIKitCore 0x00007fff47cffe99 -[UIView init] + 44
9 GastroClub 0x000000010816d313 -[UIImageView(Preloader) addPreloder] + 131
10 GastroClub 0x000000010816dcf6 -[UIImageView(Preloader) setImageWithURL_ShowPreloader:placeholderImage:options:progress:completed:] + 182
11 GastroClub 0x000000010816db69 -[UIImageView(Preloader) setImageWithURL_ShowPreloader:] + 105
12 GastroClub 0x00000001080c29f8 -[PhotoGalleryItemView viewDidLoad] + 200
13 UIKitCore 0x00007fff471cdb45 -[UIViewController _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 83
14 UIKitCore 0x00007fff471d2a9e -[UIViewController loadViewIfRequired] + 1084
15 UIKitCore 0x00007fff471d2ebb -[UIViewController view] + 27
16 UIScrollSlidingPages 0x000000010a06f2fd -[TTSlidingPage setContentViewController:] + 93
17 UIScrollSlidingPages 0x000000010a06f18b -[TTSlidingPage initWithContentViewController:] + 139
18 GastroClub 0x000000010806b32d -[RestaurantDetailViewController pageForSlidingPagesViewController:atIndex:] + 429
19 UIScrollSlidingPages 0x000000010a06b6cf -[TTScrollSlidingPagesController reloadPages] + 3455
20 GastroClub 0x0000000108060d42 __48-[RestaurantDetailViewController addPhotoSlider]_block_invoke + 50
21 libdispatch.dylib 0x000000010abc6dd4 _dispatch_call_block_and_release + 12
22 libdispatch.dylib 0x000000010abc7d48 _dispatch_client_callout + 8
23 libdispatch.dylib 0x000000010abd5de6 _dispatch_main_queue_callback_4CF + 1500
24 CoreFoundation 0x00007fff23bb1df9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
25 CoreFoundation 0x00007fff23baca59 __CFRunLoopRun + 2329
26 CoreFoundation 0x00007fff23babe16 CFRunLoopRunSpecific + 438
27 GraphicsServices 0x00007fff38438bb0 GSEventRunModal + 65
28 UIKitCore 0x00007fff4784fb68 UIApplicationMain + 1621
29 GastroClub 0x000000010801b900 main + 112
30 libdyld.dylib 0x00007fff51a1dc25 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
然后我尝试使用this solution修复该问题。我将这种方法放在我的自定义视图中，如下所示：
@interface PhotoGalleryItemView (){
GCGaleri *galleryItem;
}
@property (weak, nonatomic) IBOutlet UIImageView *IMGViewGallery;
@end
@implementation PhotoGalleryItemView
- (id)initPhotoGalleryItem:(GCGaleri*)GalleryItem ParentViewController :(RestaurantDetailViewController*)ParentViewController {
if (self) {
galleryItem = GalleryItem;
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
[_IMGViewGallery setImageWithURL_ShowPreloader:[NSURL URLWithString:galleryItem.Foto]];
_IMGViewGallery.clipsToBounds = YES;
_IMGViewGallery.contentMode = UIViewContentModeScaleAspectFill;
}
// I put here
- (UITraitCollection *)traitCollection
{
if (@available(iOS 13.0, *)) {
[UITraitCollection setCurrentTraitCollection:[[UITraitCollection alloc]init]];
} else {
// Fallback on earlier versions
};
return [[UITraitCollection alloc]init];
}
@end
在那之后，我运行我的应用程序，它因以下错误而崩溃：
2019-11-08 10:03:40.570894+0300 GastroClub[5914:42170] [TraitCollection] Class PhotoGalleryItemView overrides the -traitCollection getter, which is not supported. If you're trying to override traits, you must use the appropriate API.
2019-11-08 10:03:40.571987+0300 GastroClub[5914:42170] [Assert] Current fallback trait collection contains one or more unspecified traits: {(
"_UITraitNameDisplayGamut",
"_UITraitNameDebugHighlight",
"_UITraitNameDisplayScale",
"_UITraitNameDisplayCornerRadius",
"_UITraitNamePresentationSemanticContext",
"_UITraitNameUserInterfaceLevel",
"_UITraitNameVibrancy",
"_UITraitNameLegibilityWeight",
"_UITraitNamePreferredContentSizeCategory",
"_UITraitNameAccessibilityContrast",
"_UITraitNameTouchLevel",
"_UITraitNameSemanticContext"
)}; traitCollection: <UITraitCollection: 0x600001984600; >; currentFallbackEnvironment: <PhotoGalleryItemView: 0x7fdeb1e9cac0>
我该如何解决该问题？我无法更新我的库，因为它不再处于活动开发中。
答案 0 :(得分：1)
我找到了解决方案。 slidingPage启动时，我会显示一个预加载器。显示预载程序时发生了崩溃。当我将预加载器放在DispatchAsyncAfter中时，如下所示，我可以修复错误：
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.5 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
[self addPreloder];
__weak typeof(self) weakSelf = self;
[self sd_setImageWithURL:url
placeholderImage:placeholder
options:options
progress:progressBlock
completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageUrl) {
if (completedBlock) {
completedBlock(image, error, cacheType, imageUrl);
}
dispatch_async(dispatch_get_main_queue(), ^(void) {
if (weakSelf.preloding) {
dispatch_async(dispatch_get_main_queue(), ^(void) {
[weakSelf.preloding stopAnimating];
[weakSelf.preloding removeFromSuperview];
[weakSelf removeActivityIndicator];
});
}
});
}
];
});
答案 1 :(得分：0)
迅速5对我有用
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Double(0.5 * Double(NSEC_PER_SEC)) / Double(NSEC_PER_SEC), execute: {
// your code here
})