我想知道如何在嘗試關閉UIDoc兩次時防止崩潰。我試圖確定在我的代碼中,你(理論上)不能關閉UIDocument兩次。但是,它有時會發生,我不知道爲什麼。如果是這樣,應用程序崩潰:嘗試關閉UIDocument時防止崩潰
2012-07-06 15:24:34.470 Meernotes[11620:707] ... doc state:Normal
2012-07-06 15:24:34.472 Meernotes[11620:707] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'closeWithCompletionHandler called while document is already closing'
*** First throw call stack:
(0x3720e88f 0x34f13259 0x3720e789 0x3720e7ab 0x312681d1 0xd19db 0x96f7f 0x9593f 0xacb8f 0x30f0cd23 0x37a7f933 0x371e2a33 0x371e2699 0x371e126f 0x371644a5 0x3716436d 0x33923439 0x30f10cd5 0x94fdd 0x94f78)
terminate called throwing an exception(lldb)
我試圖防止死機如下,但它沒有任何作用(即它仍然會崩潰):
-(void)closeDoc {
UIDocumentState state = _selectedDocument.documentState;
NSMutableArray * states = [NSMutableArray array];
if (state == 0) {
[states addObject:@"Normal"];
}
if (state & UIDocumentStateClosed) {
[states addObject:@"Closed"];
}
if (state & UIDocumentStateInConflict) {
[states addObject:@"In conflict"];
}
if (state & UIDocumentStateSavingError) {
[states addObject:@"Saving error"];
}
if (state & UIDocumentStateEditingDisabled) {
[states addObject:@"Editing disabled"];
}
NSLog(@"... doc state: %@", [states componentsJoinedByString:@", "]);
if (_selectedDocument.documentState & UIDocumentStateClosed) return;
[_selectedDocument closeWithCompletionHandler:^(BOOL success) {
NSLog(@"Closed document.");
// Check status
if (!success) {
NSLog(@"Failed to close %@", _selectedDocument.fileURL);
} else {
_selectedDocument = nil;
}
}];
}
非常感謝。我完全忽略了這個收盤與收盤不一樣。 iCloud API仍然遠非完美... – 2012-07-06 14:46:16