Question

以下用于初始化数组的代码::

NSArray *array = [[NSArray alloc] initWithObjects:@"Toy Story 3",@"Inception",nil];
 self.list = [array sortedArrayUsingSelector:@selector(compare:)];
    [array release];
 [super viewDidLoad];

但是以下代码没有。一旦我尝试滚动用于查看阵列的表视图，iPhone模拟器就会终止。（仅在我滚动到空tableViewCells之后）

    NSBundle *bundle = [NSBundle mainBundle];
 NSString *plistPath = [bundle pathForResource:@"MovieList" ofType:@"plist"];
 NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];
 NSLog([array objectAtIndex:1]);
 self.list = [array sortedArrayUsingSelector:@selector(compare:)];
    [array release];
 [super viewDidLoad];

这是Dave Mark撰写的“开始iPhone开发”一书中的示例应用程序。在示例中，他们已经在代码中初始化了数组，而我尝试从外部文件初始化它。

控制台Log ::

2010-12-22 20:57:43.772 Nav[2474:40b] WARNING: Using legacy cell layout due to delegate implementation of tableView:accessoryTypeForRowWithIndexPath: in <RootViewController: 0x9908870>.  Please remove your implementation of this method and set the cell properties accessoryType and/or editingAccessoryType to move to the new cell layout behavior.  This method will no longer be called in a future release.
2010-12-22 20:58:12.480 Nav[2474:40b] WARNING: Using legacy cell layout due to delegate implementation of tableView:accessoryTypeForRowWithIndexPath: in <DisclosureButtonController: 0x9b32ab0>.  Please remove your implementation of this method and set the cell properties accessoryType and/or editingAccessoryType to move to the new cell layout behavior.  This method will no longer be called in a future release.
2010-12-22 20:59:13.299 Nav[2474:40b] -[UIDeviceRGBColor length]: unrecognized selector sent to instance 0x9b3d900
2010-12-22 20:59:13.301 Nav[2474:40b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIDeviceRGBColor length]: unrecognized selector sent to instance 0x9b3d900'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00db2be9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x00f075c2 objc_exception_throw + 47
    2   CoreFoundation                      0x00db46fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
    3   CoreFoundation                      0x00d24366 ___forwarding___ + 966
    4   CoreFoundation                      0x00d23f22 _CF_forwarding_prep_0 + 50
    5   UIKit                               0x0051a9ca -[UITableViewCellLayoutManager layoutSubviewsOfCell:] + 3424
    6   UIKit                               0x00482e02 -[UITableViewCell layoutSubviews] + 95
    7   QuartzCore                          0x01c70451 -[CALayer layoutSublayers] + 181
    8   QuartzCore                          0x01c7017c CALayerLayoutIfNeeded + 220
    9   QuartzCore                          0x01c6937c _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310
    10  QuartzCore                          0x01c690d0 _ZN2CA11Transaction6commitEv + 292
    11  QuartzCore                          0x01c997d5 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99
    12  CoreFoundation                      0x00d93fbb __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27
    13  CoreFoundation                      0x00d290e7 __CFRunLoopDoObservers + 295
    14  CoreFoundation                      0x00cf1bd7 __CFRunLoopRun + 1575
    15  CoreFoundation                      0x00cf1240 CFRunLoopRunSpecific + 208
    16  CoreFoundation                      0x00cf1161 CFRunLoopRunInMode + 97
    17  GraphicsServices                    0x016e7268 GSEventRunModal + 217
    18  GraphicsServices                    0x016e732d GSEventRun + 115
    19  UIKit                               0x002ca42e UIApplicationMain + 1160
    20  Nav                                 0x00002598 main + 102
    21  Nav                                 0x00002529 start + 53
)
terminate called after throwing an instance of 'NSException'

enter code here

Answer 1

听起来这对调试器来说是一个完美的工作，不是吗？为什么不在第一行设置一个断点，并确保在您单步执行并检查变量时，没有任何内容意外地为零或超出界限？也许注意毫无疑问记录在控制台上的错误也可能有用吗？

鉴于你既没有提到它终止的行也没有提到任何日志消息，这与任何人都可以得到的具体相同。

Answer 2

NSLog的第一个参数需要是NSString。您传递给它的对象似乎是UIColor集群的一部分。我建议你换到：

NSLog(@"%@", [array objectAtIndex:1]);

所以第一个参数肯定是一个字符串，它只是打印一个描述下一个参数的对象。

数组初始化

2 个答案: