我无法想出这个。我在IB中创建了一个自定义UITableViewCell。据我所知,我拥有单元格中的所有对象,这些对象都是正确连接的UILabel,所有内容都没有任何错误。当我尝试使用自定义单元格时,app会在尝试加载NIB时停止。我在下面列出了我的所有内容。
任何帮助或提示或在哪里寻找这一点都将不胜感激。
谢谢,
约翰
这是我的UITableViewCell接口和实现方法。我不确定我是否真的需要为init分配标签。我试过两种方式......
// 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
以下是UITableView
的cellForRowAtIndexPath的一部分// 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,而控制台中没有任何注释。如果我“踏入”我得到以下内容,我不确定与崩溃的原因有什么关系,而是由于笔尖没有正确加载......
2011-03-29 12:18:14.137 JetLogger [4565:207] *由于未捕获的异常'NSUnknownKeyException'终止应用程序,原因:'[setValue:forUndefinedKey:]:此类不是键值编码 - 符合关键城市ArrivalTimeLabel。 * 在第一次投掷时调用堆栈: ( 0 CoreFoundation 0x0111a5a9 exceptionPreprocess + 185 1 libobjc.A.dylib 0x0126e313 objc_exception_throw + 44 2 CoreFoundation 0x0111a4e1 - [NSException raise] +17 3基础0x000ca677 _NSSetUsingKeyValueSetter + 135 4基础0x000ca5e5 - [NSObject(NSKeyValueCoding)setValue:forKey:] + 285 5 UIKit 0x0054e30c - [UIRuntimeOutletConnection connect] + 112 6 CoreFoundation 0x010908cf - [NSArray makeObjectsPerformSelector:] + 239 7 UIKit 0x0054cd23 - [UINib instantiateWithOwner:options:] + 1041 8 UIKit 0x0054eab7 - [NSBundle(UINSBundleAdditions)loadNibNamed:owner:options:] + 168 9 JetLogger 0x0004bf18 - [TripEditViewController tableView:cellForRowAtIndexPath:] + 699 10 UIKit 0x003c7b98 - [UITableView(UITableViewInternal)_createPreparedCellForGlobalRow:withIndexPath:] + 634 11 UIKit 0x003bd4cc - [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 QuartzCore 0x01ff90b4 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310 17 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 CoreFoundation 0x010906e7 __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 UIKit 0x00360c93 UIApplicationMain + 1160 27 JetLogger 0x00001ba8 main + 102 28 JetLogger 0x00001b39 start + 53 ) 抛出'NSException'实例后调用终止
答案 0 :(得分:40)
在您的笔尖中的某个位置,您将某个内容连接到没有该属性的对象上的cityArrivalTimeLabel属性。确保您1)将单元格的类更改为ArrivalTimesCell,2)将该标签连接到右侧对象。
您不需要在init方法中分配/初始化标签。当笔尖加载时,它们会被简单地替换掉,所以在那之前它只是浪费RAM。