Question

我一直在开发一个iPad绘图应用程序，它使用NSUserDefaults来存储包含用户调色板选项的NSDictionary对象数组。颜色使用整数存储，该整数表示应用加载时在数组中初始化的颜色的位置。存储在NSDictionary中的第二个元素是作为float的alpha值。该应用程序在设备和模拟器上运行良好 - 除非模拟器设置为iPad Retina（64位）。

错误是：
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSCFNumber 0xb000000000000003> valueForUndefinedKey:]: this class is not key value coding-compliant for the key colorIndex.'

在AppDelegate中，调色板在实例化调色板变量的方法中初始化如下：

- (NSMutableArray *) palette
{
    NSUserDefaults *userdefaults = [NSUserDefaults standardUserDefaults];
    NSArray *userPalette = [userdefaults arrayForKey:@"palette"];
    NSMutableArray *palette = [userPalette mutableCopy];
    if (!palette) //  get 12 initial colors for palette
    {
        palette = [[NSMutableArray alloc] initWithCapacity:12];
        for (int x = 0; x < 12; x++) {
            NSDictionary *paletteObject = [[NSDictionary alloc] initWithObjectsAndKeys:
                                       [NSNumber numberWithInt: x], @"colorIndex",
                                       [NSNumber numberWithFloat: 1.0], @"colorOpacity",
                                       nil];
            [palette addObject: paletteObject];
        }
    }
    return palette;
}

首次启动时，会使用列表中的前12种颜色。

ViewController包含调色板，作为在故事板中设置的子类UIButtons的IBOutletCollection。

@property (nonatomic, strong) IBOutletCollection (ColorButton) NSArray *paletteButtons;

当ViewController在64位版本上启动时，以下代码会触发崩溃：

- (void) loadPaletteButtons
{
    [[NSUserDefaults standardUserDefaults] synchronize];
    _palette = [[[NSUserDefaults standardUserDefaults] objectForKey:@"palette"] mutableCopy];

NSLog(@"CP | loadPaletteButtons ");
for (int i = 0; i < [_palette count]; i++)
{
    NSDictionary *paletteColor = _palette[i];

    NSLog(@"[paletteColor valueForKey:@colorIndex is %@", [paletteColor valueForKey:@"colorIndex"] );

    int colorIndex = [[paletteColor valueForKey:@"colorIndex"] intValue];
    [_paletteButtons[i] setBackgroundColor:[_colors objectAtIndex: colorIndex]];
    [_paletteButtons[i] setTag: colorIndex];

    if (![paletteColor valueForKey: @"colorOpacity"]) {
        [_paletteButtons[i] setColorOpacity: [[paletteColor valueForKey: @"colorOpacity"] floatValue]];
    } else {
        [_paletteButtons[i] setColorOpacity: 1.0];
    }
} // end for loop to load palette buttons

}

该方法触发NSLog输出;也就是说，NSUserDefaults似乎没有触发错误。但colorIndex值似乎是个问题。我还没有能够在这个或任何其他网站上找到解释问题的任何内容 - 也不知道如何解决它。我很难过。

堆栈追踪：

2014-06-02 12:48:12.955 theApp[871:60b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<__NSCFNumber 0xb000000000000003> valueForUndefinedKey:]: this class is not key value coding-compliant for the key colorIndex.'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000101e05495 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x0000000101b6499e objc_exception_throw + 43
    2   CoreFoundation                      0x0000000101e89919 -[NSException raise] + 9
    3   Foundation                          0x00000001017c93c6 -[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 226
    4   Foundation                          0x0000000101746155 -[NSObject(NSKeyValueCoding) valueForKey:] + 251
    5   theApp                              0x000000010000f602 -[ControlPanel loadPaletteButtons] + 402
    6   theApp                              0x000000010000f17c -[ControlPanel viewDidLoad] + 364
    7   UIKit                               0x000000010080759e -[UIViewController loadViewIfRequired] + 562
    8   UIKit                               0x0000000100807777 -[UIViewController view] + 29
    9   theApp                              0x00000001000151cc -[theAppViewController viewDidLoad] + 828
    10  UIKit                               0x000000010080759e -[UIViewController loadViewIfRequired] + 562
    11  UIKit                               0x0000000100807777 -[UIViewController view] + 29
    12  UIKit                               0x000000010074796b -[UIWindow addRootViewControllerViewIfPossible] + 58
    13  UIKit                               0x0000000100747c70 -[UIWindow _setHidden:forced:] + 282
    14  UIKit                               0x0000000100750ffa -[UIWindow makeKeyAndVisible] + 51
    15  UIKit                               0x000000010070cc98 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1788
    16  UIKit                               0x0000000100710a0c -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 660
    17  UIKit                               0x0000000100721d4c -[UIApplication handleEvent:withNewEvent:] + 3189
    18  UIKit                               0x0000000100722216 -[UIApplication sendEvent:] + 79
    19  UIKit                               0x0000000100712086 _UIApplicationHandleEvent + 578
    20  GraphicsServices                    0x000000010346371a _PurpleEventCallback + 762
    21  GraphicsServices                    0x00000001034631e1 PurpleEventCallback + 35
    22  CoreFoundation                      0x0000000101d87679 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
    23  CoreFoundation                      0x0000000101d8744e __CFRunLoopDoSource1 + 478
    24  CoreFoundation                      0x0000000101db0903 __CFRunLoopRun + 1939
    25  CoreFoundation                      0x0000000101dafd83 CFRunLoopRunSpecific + 467
    26  UIKit                               0x00000001007102e1 -[UIApplication _run] + 609
    27  UIKit                               0x0000000100711e33 UIApplicationMain + 1010
    28  theApp                              0x00000001000015f3 main + 115
    29  libdyld.dylib                       0x0000000102bd25fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

iOS - NSUserDefaults导致iPad Retina（64位）崩溃

0 个答案: