更新至 iOS SDK 8.0。
应用因错误而崩溃
[PFInternalUtils assertValidClassForQuery:] at PFInternalUtils.m:372
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Cannot do a comparison query for type: (null)'
*** First throw call stack:
(
0 CoreFoundation 0x032d6df6 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x02f60a97 objc_exception_throw + 44
2 CoreFoundation 0x032d6d1d +[NSException raise:format:] + 141
3 0x000e60b2 +[PFInternalUtils assertValidClassForQuery:] + 324
4 0x000ce3cb -[PFQuery whereKey:equalTo:] + 91
5 0x000b7391 -[InboxViewController retrieveMessages] + 193
6 0x000b624c -[InboxViewController viewWillAppear:] + 236
7 UIKit 0x01aa614f -[UIViewController _setViewAppearState:isAnimating:] + 545
8 UIKit 0x01aa66ca -[UIViewController __viewWillAppear:] + 148
9 UIKit 0x01ad8389 -[UINavigationController _startTransition:fromViewController:toViewController:] + 931
10 UIKit 0x01ad8fdb -[UINavigationController _startDeferredTransitionIfNeeded:] + 669
11 UIKit 0x01ad9c52 -[UINavigationController __viewWillLayoutSubviews] + 57
12 UIKit 0x01c4bebc -[UILayoutContainerView layoutSubviews] + 213
13 UIKit 0x019d59c0 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 608
14 libobjc.A.dylib 0x02f76771 -[NSObject performSelector:withObject:] + 70
15 QuartzCore 0x00c9827f -[CALayer layoutSublayers] + 152
16 QuartzCore 0x00c8c105 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 397
17 QuartzCore 0x00c8bf60 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
18 QuartzCore 0x00bea676 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 284
19 QuartzCore 0x00beba3c _ZN2CA11Transaction6commitEv + 392
20 QuartzCore 0x00cb1789 +[CATransaction flush] + 52
21 UIKit 0x019487e6 -[UIApplication _reportMainSceneUpdateFinished:] + 39
22 UIKit 0x01949761 -[UIApplication _runWithMainScene:transitionContext:completion:] + 3163
23 UIKit 0x01961d30 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke + 59
24 UIKit 0x01947d7f -[UIApplication workspaceDidEndTransaction:] + 155
25 FrontBoardServices 0x064069de __37-[FBSWorkspace clientEndTransaction:]_block_invoke_2 + 71
26 FrontBoardServices 0x0640646f __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 54
27 FrontBoardServices 0x06418425 __31-[FBSSerialQueue performAsync:]_block_invoke + 26
28 CoreFoundation 0x031fa7a0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 16
29 CoreFoundation 0x031f00b3 __CFRunLoopDoBlocks + 195
30 CoreFoundation 0x031eff0b __CFRunLoopRun + 2715
31 CoreFoundation 0x031ef1ab CFRunLoopRunSpecific + 443
32 CoreFoundation 0x031eefdb CFRunLoopRunInMode + 123
33 UIKit 0x01947744 -[UIApplication _run] + 571
34 UIKit 0x0194ae16 UIApplicationMain + 1526
35 0x000b567d main + 141
36 libdyld.dylib 0x04dddac9 start + 1
37 ??? 0x00000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
编辑:
- (void)retrieveMessages {
PFQuery *query = [PFQuery queryWithClassName:@"Messages"];
[query whereKey:@"recipientIds" equalTo:[[PFUser currentUser] objectId]];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (error) {
NSLog (@"Error:%@ %@", error, [error userInfo]);
}
else {
//we found messages
self.messages = objects;
[self.tableView reloadData];
NSLog (@"Retrieved %d messages", [self.messages count]);
}
if([self.refreshControl isRefreshing]) {
[self.refreshControl endRefreshing];
}
}];
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.moviePlayer = [[MPMoviePlayerController alloc] init];
PFUser *currentUser = [PFUser currentUser];
if (currentUser){
NSLog (@"CurrentUser:%@", currentUser.username);
}
else{
[self performSegueWithIdentifier:@"showLogin" sender:self];
}
self.refreshControl = [[UIRefreshControl alloc] init];
[self.refreshControl addTarget:self action:@selector(retrieveMessages) forControlEvents:UIControlEventValueChanged];
}
- (void) viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.navigationController.navigationBar setHidden:NO];
[self retrieveMessages];
}
使用 parse.com 作为支持。
在更新之前它工作正常。
请知道如何解决此错误。
感谢您的帮助。
最佳答案
出现此错误似乎是因为您正在执行一个用户必须登录的函数，但在执行该函数时并非如此。
看着other questions ，具体错误似乎与4 0x000ce3cb -[PFQuery whereKey:equalTo:] + 91有关。
查看上面的链接问题，完整的问题陈述很可能是[PFQuery whereKey:equalTo:[PFUser currentUser]]。
查看您的代码，以下是问题根源的代码:
[query whereKey:@"recipientIds" equalTo:[[PFUser currentUser] objectId]];
如前所述，如果用户未登录，您需要捕捉并通过添加 return 来阻止函数中的主要代码运行。
链接问题的答案之一:
I just ran into this and it was due to the fact that I was doing an equalTo:[PFUser currentUser] in a PFQuery but there was no logged-in user at that point.
至于当您升级到 iOS 8 SDK(您使用的是 Xcode 6.0.1 和最新的 Parse SDK，对吗？)时为什么会出现这种情况，我不确定；也许它与升级无关，您更改了某些内容导致出现此错误。
关于ios - 更新到 iOS sdk 8.0 后应用程序崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26148929/