Ios 具有无效谓词的核心数据崩溃：nil RHS
我在执行fetch请求时发生了此崩溃，但从崩溃报告中可以清楚地看出，崩溃的原因是谓词为nil。我已经为起始日期为零的情况添加了一张支票。我应该注意的无效谓词是否还有其他潜在原因Ios 具有无效谓词的核心数据崩溃：nil RHS,ios,objective-c,core-data,Ios,Objective C,Core Data,我在执行fetch请求时发生了此崩溃，但从崩溃报告中可以清楚地看出，崩溃的原因是谓词为nil。我已经为起始日期为零的情况添加了一张支票。我应该注意的无效谓词是否还有其他潜在原因 NSFetchRequest *calRequest = [NSFetchRequest fetchRequestWithEntityName:@"Calendar"]; calRequest.predicate = [NSPredicate predicateWithFormat:@"date >= %@", s
NSFetchRequest *calRequest = [NSFetchRequest fetchRequestWithEntityName:@"Calendar"];
calRequest.predicate = [NSPredicate predicateWithFormat:@"date >= %@", startDate];
calRequest.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"date" ascending:YES]];
NSError *error = nil;
NSArray *results = [appDelegate.managedObjectContext executeFetchRequest:calRequest error:&error];
Thread : Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x30534f03 __exceptionPreprocess + 130
1 libobjc.A.dylib 0x3acc9ce7 objc_exception_throw + 38
2 CoreData 0x30289f17 -[NSComparisonPredicate(_NSCoreDataSQLPredicateCategories) minimalFormInContext:] + 926
3 CoreData 0x3028952b -[NSSQLGenerator initializeContextForFetchRequest:ignoreInheritance:nestingLevel:] + 538
4 CoreData 0x30288f9f -[NSSQLGenerator newSQLStatementForFetchRequest:ignoreInheritance:countOnly:nestingLevel:] + 34
5 CoreData 0x30288e3f -[NSSQLAdapter _newSelectStatementWithFetchRequest:ignoreInheritance:] + 406
6 CoreData 0x30288aa3 -[NSSQLCore newRowsForFetchPlan:] + 114
7 CoreData 0x302881e7 -[NSSQLCore objectsForFetchRequest:inContext:] + 698
8 CoreData 0x30287c8b -[NSSQLCore executeRequest:withContext:error:] + 446
9 CoreData 0x30287539 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 2892
10 CoreData 0x3028593b -[NSManagedObjectContext executeFetchRequest:error:] + 614
11 MyApp 0x0010b769 -[Calendar calendarLoad] (Calendar.m:152)
...
在创建谓词之前，是否尝试记录
startDate