我有一个使用UIManagedDocument
与Core Data进行交互的旧应用。然而,在iOS 11.2(以及可能早期的iOS 11点发布)上,saveToURL:forSaveOperation:completionHandler:
方法似乎已停止在设备上和模拟器中工作(但 仍在iOS 10.3中工作.1模拟器)。具体来说,在下面的代码中,第一个completionHandler
语句中的if
永远不会被执行(如NSLog
条消息所示)。
- (void)useDemoDocument {
NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
url = [url URLByAppendingPathComponent:@"TWL_Document"];
UIManagedDocument *document = [[UIManagedDocument alloc] initWithFileURL:url];
if (![[NSFileManager defaultManager] fileExistsAtPath:[url path]]) {
NSLog(@"This Code Executes");
[document saveToURL:url
forSaveOperation:UIDocumentSaveForCreating
completionHandler:^(BOOL success) {
if (success) {
NSLog(@"But this is never called");
self.managedObjectContext = document.managedObjectContext;
} else {
NSLog(@"This also is not called");
}
}];
} else if (document.documentState == UIDocumentStateClosed) {
[document openWithCompletionHandler:^(BOOL success) {
if (success) {
self.managedObjectContext = document.managedObjectContext;
}
}];
} else {
self.managedObjectContext = document.managedObjectContext;
}
}
相反,我收到The reader is not permitted to access the URL.
:
2017-12-17 12:38:14.258936-0800 ToWatchList[1864:542434] [default] [ERROR] Could not get attribute values for item /var/mobile/Containers/Data/Application/2[UUID]/Documents/TWL_Document (n). Error: Error Domain=NSFileProviderInternalErrorDomain Code=1 "The reader is not permitted to access the URL." UserInfo={NSLocalizedDescription=The reader is not permitted to access the URL.}
这里发生了什么?有关如何在iOS 11中重新运行的任何建议吗?