應用程序正在崩潰，爲什麼？

我真正的代碼是完全的NSLog的，下面一行是原因，他崩潰，但我不明白爲什麼應用程序正在崩潰，爲什麼？

的NSString * NEWDIR =的[documentsDirectory stringByAppendingPathComponent：文件]。

這裏是整個方法：

- (void)viewDidLoad { 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSFileManager *fileManager = [NSFileManager defaultManager];  
    NSArray* newArray= [[NSArray alloc]init]; 
    newArray= [fileManager contentsOfDirectoryAtURL:[NSURL fileURLWithPath:@"/Users/admin/Library/FotoAppFotos/"] 
    includingPropertiesForKeys:[NSArray arrayWithObject:NSURLNameKey]          options:NSDirectoryEnumerationSkipsHiddenFiles error:nil];   
    categories= [NSMutableArray arrayWithArray: newArray]; 

     for(NSString *file in categories) { 

     NSString *newDir = [documentsDirectory stringByAppendingPathComponent:file]; // in this line the app crashes   
     [categories addObject:newDir]; //categories   
     } 
     [super viewDidLoad]; 
    }

如前所述documentsDirectory和文件的NSLog打印有：

documentsDirectory：/用戶/管理員/庫/ Application Support/iPhone Simulator/4.3/Applications/D5AB6F90-0420-4A66-B141-D27AB2C11C3C/Documents

file：// localhost/Users/admin/Library/FotoAppFotos /音頻/

整個崩潰日誌是：

2011-11-09 09:21:42.989 TestTest[543:207] -[NSURL length]: unrecognized selector sent to instance 0x5c07df0 
2011-11-09 09:21:42.992 TestTest[543:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSURL length]: unrecognized selector sent to instance 0x5c07df0' 
*** Call stack at first throw: 
(
    0 CoreFoundation      0x0102b5a9 __exceptionPreprocess + 185 
    1 libobjc.A.dylib      0x0117f313 objc_exception_throw + 44 
    2 CoreFoundation      0x0102d0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 
    3 CoreFoundation      0x00f9c966 ___forwarding___ + 966 
    4 CoreFoundation      0x00f9c522 _CF_forwarding_prep_0 + 50 
    5 Foundation       0x0002b1ad -[NSPathStore2 stringByAppendingPathComponent:] + 211 
    6 TestTest       0x00003244 -[Produktpalette viewDidLoad] + 535 
    7 UIKit        0x0036f089 -[UIViewController view] + 179 
    8 UIKit        0x0060ca40 -[UIPopoverController _setupIncomingViewController:presenting:animated:] + 143 
    9 UIKit        0x0060be26 -[UIPopoverController initWithContentViewController:] + 321 
    10 TestTest       0x00002540 -[TestTestViewController produktpalette:] + 151 
    11 UIKit        0x002bf4fd -[UIApplication sendAction:to:from:forEvent:] + 119 
    12 UIKit        0x004d1cc3 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 156 
    13 UIKit        0x002bf4fd -[UIApplication sendAction:to:from:forEvent:] + 119 
    14 UIKit        0x0034f799 -[UIControl sendAction:to:forEvent:] + 67 
    15 UIKit        0x00351c2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 
    16 UIKit        0x003507d8 -[UIControl touchesEnded:withEvent:] + 458 
    17 UIKit        0x002e3ded -[UIWindow _sendTouchesForEvent:] + 567 
    18 UIKit        0x002c4c37 -[UIApplication sendEvent:] + 447 
    19 UIKit        0x002c9f2e _UIApplicationHandleEvent + 7576 
    20 GraphicsServices     0x01983992 PurpleEventCallback + 1550 
    21 CoreFoundation      0x0100c944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 
    22 CoreFoundation      0x00f6ccf7 __CFRunLoopDoSource1 + 215 
    23 CoreFoundation      0x00f69f83 __CFRunLoopRun + 979 
    24 CoreFoundation      0x00f69840 CFRunLoopRunSpecific + 208 
    25 CoreFoundation      0x00f69761 CFRunLoopRunInMode + 97 
    26 GraphicsServices     0x019821c4 GSEventRunModal + 217 
    27 GraphicsServices     0x01982289 GSEventRun + 115 
    28 UIKit        0x002cdc93 UIApplicationMain + 1160 
    29 TestTest       0x00001c2a main + 84 
    30 TestTest       0x00001bcd start + 53 
) 
terminate called after throwing an instance of 'NSException'

感謝您的幫助和推定提前

來源

2011-11-09 Studie

請張貼崩潰日誌。 – Raptor

我編輯了我的問題......見上面:) – Studie

的提示來自：

[NSURL length]: unrecognized selector sent to instance

如果你正在iOS上工作，很遺憾地告訴你：

此方法在iOS中未實現，因此它不執行任何操作。

有人有類似problem。

來源

2011-11-09 09:04:33 Raptor

非常感謝......我糾正了我的錯誤:) – Studie

應用程序正在崩潰，爲什麼？

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