[[NSBundle mainBundle] loadNibnamed:owner:options:]崩溃

Question

我想不出这个办法。我在IB中创建了一个定制的UITableViewCell。据我所知，我有单元格中的所有对象，它们都是正确连接的UILabels，所有的东西都没有任何错误地构建。当我尝试使用自定义单元格时，当我尝试加载NIB时，应用程序会停止。我已经列出了我在下面的位置。

任何帮助或暗示，或在哪里找出这一个将不胜感激。

谢谢,

约翰

下面是我的UITableViewCell接口和实现方法。我不确定我真的需要分配标签。我试过两种方法..。

//  ArrivalTimesCell.h

#import <UIKit/UIKit.h>

@interface ArrivalTimesCell : UITableViewCell {
    IBOutlet UILabel *cityArrivalTimeLabel;
    IBOutlet UILabel *optimumArrivalTimeLabel;
    IBOutlet UILabel *arrivalAvoidTimesLabel;
    IBOutlet UILabel *arrivalTimeNotSetLabel;

}
@property (nonatomic, retain)IBOutlet UILabel *cityArrivalTimeLabel;
@property (nonatomic, retain)IBOutlet UILabel *optimumArrivalTimeLabel;
@property (nonatomic, retain)IBOutlet UILabel *arrivalAvoidTimesLabel;
@property (nonatomic, retain)IBOutlet UILabel *arrivalTimeNotSetLabel;

@end

//  ArrivalTimesCell.m

#import "ArrivalTimesCell.h"

@implementation ArrivalTimesCell
@synthesize arrivalTimeNotSetLabel, arrivalAvoidTimesLabel, optimumArrivalTimeLabel, cityArrivalTimeLabel;

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        arrivalTimeNotSetLabel = [[UILabel alloc] init];
        arrivalAvoidTimesLabel = [[UILabel alloc] init];
        optimumArrivalTimeLabel = [[UILabel alloc] init];
        cityArrivalTimeLabel = [[UILabel alloc] init];
    }
    return self;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated{
    [super setSelected:selected animated:animated];

}

- (void)dealloc{
    [super dealloc];
    [arrivalTimeNotSetLabel release];
    arrivalTimeNotSetLabel = nil;
    [arrivalAvoidTimesLabel release];
    arrivalAvoidTimesLabel = nil;
    [optimumArrivalTimeLabel release];
    optimumArrivalTimeLabel = nil;
    [cityArrivalTimeLabel release];
    cityArrivalTimeLabel = nil;
}

@end

下面是cellForRowAtIndexPath的一部分，用于UITableView

//  TripEditViewController.m

#import "ArrivalTimesCell.h"

@implementation TripEditViewController

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    CellIdentifier = @"ArrivalTimesCell";
    ArrivalTimesCell *cell = (ArrivalTimesCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if(cell == nil){
        NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"ArrivalTimesCell" owner:nil options:nil];

        for (id currentObject in topLevelObjects) {
            if ([currentObject isKindOfClass:[UITableViewCell class]]) {
                cell = (ArrivalTimesCell *) currentObject;
                break;
             }
         }      
    }


    cell.cityArrivalTimeLabel.text = @"Whatever"
    cell.arrivalAvoidTimesLabel.text = @"Whatever";
    cell.optimumArrivalTimeLabel.text = @"Whatever";
    cell.arrivalTimeNotSetLabel.text = @"Whatever";

    return cell;  
}

程序执行在loadNibNamed行上停止，控制台中没有任何注释。如果我“一步一步”，我得到以下我不确定是否与我的崩溃原因有任何关系，但结果是nib没有正确加载.

2011-03-29 12:18:14.137 JetLogger4565:207个*终止应用程序因未察觉的异常“NSUnknownKeyException”，原因：‘setValue:forUndefinedKey:该类不符合键cityArrivalTimeLabel的键值编码。’*第一次抛出时的调用堆栈：(0 CoreFoundation 0x0111a5a9 exceptionPreprocess + 185 1 libobjc.A.dylib 0x0126e313 objc_exception_throw + 44 2 CoreFoundation 0x0111a4e1 -NSException raise + 17 3 Foundation )0x000ca677 _NSSetUsingKeyValueSetter + 135 4 Foundation 0x000ca5e5 -NSObject(NSKeyValueCoding) setValue:forKey：+ 285 5 UIKit 0x0054e30c -UIRuntimeOutletConnection connect + 112 6 CoreFoundation 0x010908 239 makeObjectsPerformSelector：+239 7 UIKit 0x0054cd23 -UINib instantiateWithOwner：选项：+ 1041 8 _createPreparedCellForGlobalRow:withIndexPath: 0x0054eab7 -NSBundle(UINSBundleAdditions) -NSBundle:owner: options：+ 168 9 JetLogger 0x0004bf18 -TripEditViewController tableView:cellForRowAtIndexPath：+ 699 10 UIKit 0x003c7b98 -UITableView(UITableViewInternal) -UITableView+ 634 11 UIKit0x003bd4cc -UITableView(UITableViewInternal) _createPreparedCellForGlobalRow：+ 75 12 UIKit 0x003d28cc -UITableView(_UITableViewPrivate) _updateVisibleCellsNow：+ 1561 13 UIKit 0x003ca90c -UITableView layoutSubviews + 242 14 QuartzCore 0x02051a5a -CALayer layoutSublayers + 181 15 QuartzCore 0x02053ddc CALayerLayoutIfNeeded + 220 16_ZN2CA7Context18commit_transactionEPNS_11TransactionE +31017 QuartzCore 0x01ffa294 _ZN2CA11Transaction6commitEv + 292 18 QuartzCore 0x01ffa46d _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99 19 CoreFoundation 0x010fb89b __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 27 20 CoreFoundation0x010906e7 __CFRunLoopDoObservers + 295 21 CoreFoundation 0x010591d7 __CFRunLoopRun + 1575 22 CoreFoundation 0x01058840 CFRunLoopRunSpecific + 208 23 CoreFoundation 0x01058761 CFRunLoopRunInMode + 97 24 GraphicsServices 0x01a081c4 GSEventRunModal + 217 25 GraphicsServices 0x01a08289 GSEventRun + 115 26 UIKit0x00360c93 UIApplicationMain + 1160 27 JetLogger 0x00001ba8 main + 102 28 JetLogger 0x00001b39 start + 53 )抛出'NSException'

实例后调用终止

Answer 1

在您的nib中的某个位置，您可以将一些东西连接到没有该属性的对象上的cityArrivalTimeLabel属性。确保将单元格的类更改为ArrivalTimesCell，并将该标签连接到正确的对象。

您不需要在init方法中分配/插入标签。它们只是在nib加载时被替换，所以在此之前它只是浪费RAM。