所以我在我的核心数据中搜索当前地图经度和纬度内的项目。每次我运行该语句都会崩溃。
代码：
NSError *error = nil;
NSFetchRequest *boutiqueRequest = [[NSFetchRequest alloc] init];
NSPredicate *predicateToRun = nil;
[boutiqueRequest setEntity:[NSEntityDescription entityForName:@"Boutique" inManagedObjectContext:managedObjectContext]];
NSLog(@"NE Longitude: %f", [neCoordLong floatValue]);
NSLog(@"NE Latitude: %f", [neCoordLat floatValue]);
NSLog(@"SW Longitude: %f", [swCoordLong floatValue]);
NSLog(@"SW Latitude: %f", [swCoordLat floatValue]);
NSPredicate *longPredicate = [NSPredicate predicateWithFormat: @"longitude BETWEEN %@", [NSArray arrayWithObjects:neCoordLong, swCoordLong, nil]];
NSPredicate *latPredicate = [NSPredicate predicateWithFormat: @"latitude BETWEEN %@", [NSArray arrayWithObjects:neCoordLat, swCoordLat, nil]];
predicateToRun = [NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects:longPredicate, latPredicate, nil]];
[boutiqueRequest setPredicate:predicateToRun];
NSLog(@"%@", [boutiqueRequest predicate]);
NSArray *results = [managedObjectContext executeFetchRequest:boutiqueRequest error:&error];
一旦我调用executeFetchRequest，它就会给我以下崩溃报告
2011-02-24 17：42：43.183 DL2 [363：207] NE经度：153.5058 2011-02-24 17：42：43.183 DL2 [363：207] NE纬度：-27.811142 2011-02-24 17：42：43.183 DL2 [363：207] SW经度：153.286057 2011-02-24 17：42：43.184 DL2 [363：207] SW纬度：-28.033804 2011-02-24 17：42：43.184 DL2 [363：207]经度BETWEEN {153.5058,153.2861}和纬度BETWEEN {-27.81114，-28.0338}
2011-02-24 13:57:18.916 DL2[9628:207] -[NSCFNumber constantValue]: unrecognized selector sent to instance 0x954ba80
2011-02-24 13:57:18.925 DL2[9628:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFNumber constantValue]: unrecognized selector sent to instance 0x954ba80'
*** Call stack at first throw:
(
0 CoreFoundation 0x0121abe9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x0136f5c2 objc_exception_throw + 47
2 CoreFoundation 0x0121c6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x0118c366 ___forwarding___ + 966
4 CoreFoundation 0x0118bf22 _CF_forwarding_prep_0 + 50
5 CoreData 0x00e18a0b -[NSSQLSimpleWhereIntermediate _generateSQLBetweenStringInContext:] + 1211
6 CoreData 0x00d48931 -[NSSQLSimpleWhereIntermediate generateSQLStringInContext:] + 897
7 CoreData 0x00d4843d -[NSSQLCompoundWhereIntermediate _generateMulticlauseStringInContext:] + 205
8 CoreData 0x00d48342 -[NSSQLCompoundWhereIntermediate generateSQLStringInContext:] + 770
9 CoreData 0x00d47afa -[NSSQLFetchIntermediate generateSQLStringInContext:] + 122
10 CoreData 0x00e0b31d -[NSSQLGenerator newSQLStatementForFetchRequest:ignoreInheritance:countOnly:nestingLevel:] + 413
11 CoreData 0x00d43a78 -[NSSQLAdapter _newSelectStatementWithFetchRequest:ignoreInheritance:] + 488
12 CoreData 0x00d43881 -[NSSQLAdapter newSelectStatementWithFetchRequest:] + 49
13 CoreData 0x00d4372e -[NSSQLCore newRowsForFetchPlan:] + 430
14 CoreData 0x00d42ab5 -[NSSQLCore objectsForFetchRequest:inContext:] + 357
15 CoreData 0x00d4266e -[NSSQLCore executeRequest:withContext:error:] + 206
16 CoreData 0x00df20ec -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 1084
17 CoreData 0x00d3f807 -[NSManagedObjectContext executeFetchRequest:error:] + 359
18 DL2 0x00021060 -[BoutiqueListViewController getBoutiquesToShow] + 1449
19 DL2 0x0002164f -[BoutiqueListViewController viewDidLoad] + 211
20 UIKit 0x003f265e -[UIViewController view] + 179
21 DL2 0x0001ff4e -[BoutiqueMapTabViewController openList] + 698
22 DL2 0x0001f9f3 -[BoutiqueMapTabViewController tabBar:didSelectItem:] + 110
23 UIKit 0x00542167 -[UITabBar _sendAction:withEvent:] + 283
24 UIKit 0x00344a6e -[UIApplication sendAction:to:from:forEvent:] + 119
25 UIKit 0x003d31b5 -[UIControl sendAction:to:forEvent:] + 67
26 UIKit 0x003d5647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
27 UIKit 0x003d316c -[UIControl sendActionsForControlEvents:] + 49
28 UIKit 0x00344a6e -[UIApplication sendAction:to:from:forEvent:] + 119
29 UIKit 0x003d31b5 -[UIControl sendAction:to:forEvent:] + 67
30 UIKit 0x003d5647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
31 UIKit 0x003d41f4 -[UIControl touchesEnded:withEvent:] + 458
32 UIKit 0x003690d1 -[UIWindow _sendTouchesForEvent:] + 567
33 UIKit 0x0034a37a -[UIApplication sendEvent:] + 447
34 UIKit 0x0034f732 _UIApplicationHandleEvent + 7576
35 GraphicsServices 0x01b3da36 PurpleEventCallback + 1550
36 CoreFoundation 0x011fc064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
37 CoreFoundation 0x0115c6f7 __CFRunLoopDoSource1 + 215
38 CoreFoundation 0x01159983 __CFRunLoopRun + 979
39 CoreFoundation 0x01159240 CFRunLoopRunSpecific + 208
40 CoreFoundation 0x01159161 CFRunLoopRunInMode + 97
41 GraphicsServices 0x01b3c268 GSEventRunModal + 217
42 GraphicsServices 0x01b3c32d GSEventRun + 115
43 UIKit 0x0035342e UIApplicationMain + 1160
44 DL2 0x000028fc main + 102
45 DL2 0x0000288d start + 53
我似乎无法看到问题。我不知道我是否太接近它，或者它是否与它是浮动或什么有关！任何帮助将不胜感激
答案 0 :(得分：8)
好吧，我无法解决为什么Between函数不起作用 - 但mysql也不允许BETWEEN浮点数。所以我会假设这是一个类似的原因。
我将代码更改为仅在语句之间创建自己的代码。
NSPredicate *longPredicate = nil;
NSPredicate *latPredicate = nil;
if ([neCoordLong floatValue] > [swCoordLong floatValue])
{
longPredicate = [NSPredicate predicateWithFormat: @" longitude <= %@ AND longitude >= %@", neCoordLong, swCoordLong];
}else {
longPredicate = [NSPredicate predicateWithFormat: @" longitude <= %@ AND longitude >= %@", swCoordLong, neCoordLong];
}
if ([neCoordLat floatValue] > [swCoordLat floatValue])
{
latPredicate = [NSPredicate predicateWithFormat: @" latitude <= %@ AND latitude >= %@", neCoordLat, swCoordLat];
}else {
latPredicate = [NSPredicate predicateWithFormat: @" latitude <= %@ AND latitude >= %@", swCoordLat, neCoordLat];
}
希望这有助于其他人
答案 1 :(得分：1)
我也有类似的错误。我很确定这是一个非常低级别的数据库相关问题。这是我的一些更多信息 -
一个。使用内存数据库，我可以运行具有完全相同数据的测试用例。 湾当我收到错误“ - [__ NSCFNumber constantValue]：无法识别的选择器发送到实例0xa9e4ca0”。我做了
(lldb) po 0xa9e4ca0
$0 = 178146464 -96.24999189101783
不确定178146464来自哪里。我现在将尝试手册“之间”。
答案 2 :(得分：0)
我也没有看到确切的原因，并且你没有显示设置其余的boutiqueRequest属性并触发fetch的代码（除非你再次设置谓词或其他别的时髦，否则它不重要），但报告
2011-02-24 13：57：18.916 DL2 [9628：207] - [NSCFNumber constantValue]：无法识别的选择器发送到实例0x954ba80
表示您正在将消息-constantValue发送到类NSCFNumber（一个免费的NSNumber / CFNumber实例）的对象，该对象不处理它。因此，我建议您尝试仅使用谓词的某些部分来查找哪些不会，并且确实会导致谓词中的某个表达式被NSCFNumber实例替换。
答案 3 :(得分：0)
在你的获取开始时你宣布
NSPredicate *predicateToRun = nil;
然后在
中为它分配一个NSCompoundPredicate predicateToRun = [NSCompoundPredicate andPredicateWithSubpredicates:[NSArray arrayWithObjects:longPredicate, latPredicate, nil]];
看看是否解决了这个问题。 ROG