Question

我见过有关无法识别的选择器错误的其他帖子，但没有关于以下方法中自动生成代码的内容：

- (void)tableView:(UITableView *)tableView commitEditingStyle:forRowAtIndexPath:

当我滑动删除时调用此方法，当我点击删除按钮时出现以下错误：

- [Vehicle removeObjectFromGasUpsAtIndex：]：无法识别的选择器发送到实例0x8172c60

我的NSManagedObject类Vehicle有一个名为gasUps的NSOrderedSet变量，当我要删除它时，它应响应此消息。或者我想。

以下是崩溃的整个方法：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
   if (editingStyle == UITableViewCellEditingStyleDelete) {
    // need to delete gas up and not vehicle
    int row = [indexPath row];

    //[self.selectedVehicle removeObjectFromGasUpsAtIndex:row];
    [self.selectedVehicle removeObjectFromGasUpsAtIndex:row];
    NSError *error = nil;
    if (![self.managedObjectContext save:&error]) {
         // Replace this implementation with code to handle the error appropriately.
         // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. 
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }
 }   
}

为什么这个选择器无法识别？

编辑：这是为了Jody。

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

typedef enum {
    FullExtract,
    NameExtract
} kTitleExtract;

@interface Vehicle : NSManagedObject

@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSNumber * year;
@property (nonatomic, retain) NSString * make;
@property (nonatomic, retain) NSNumber * mileage;
@property (nonatomic, retain) NSString * model;
@property (nonatomic, retain) NSOrderedSet *gasUps;

// added methods
- (NSString *)getTitleExtract:(kTitleExtract)titleExtract;

@end

@interface Vehicle (CoreDataGeneratedAccessors)

- (void)insertObject:(NSManagedObject *)value inGasUpsAtIndex:(NSUInteger)idx;
- (void)removeObjectFromGasUpsAtIndex:(NSUInteger)idx;
- (void)insertGasUps:(NSArray *)value atIndexes:(NSIndexSet *)indexes;
- (void)removeGasUpsAtIndexes:(NSIndexSet *)indexes;
- (void)replaceObjectInGasUpsAtIndex:(NSUInteger)idx withObject:(NSManagedObject *)value;
- (void)replaceGasUpsAtIndexes:(NSIndexSet *)indexes withGasUps:(NSArray *)values;
- (void)addGasUpsObject:(NSManagedObject *)value;
- (void)removeGasUpsObject:(NSManagedObject *)value;
- (void)addGasUps:(NSOrderedSet *)values;
- (void)removeGasUps:(NSOrderedSet *)values;

@end

以下是设置self.selectedVehicle的代码片段：

if (self.vehiclesArray != nil  && [self.vehiclesArray count] != 0 && self.vehicleIndex != -1) {
    // enable add buttom
    [self.navigationItem.rightBarButtonItem setEnabled:YES];
    self.selectedVehicle = [self.vehiclesArray objectAtIndex:self.vehicleIndex];
    NSLog(@"set selected vehicle");
} else {
    // disable add button
    [self.navigationItem.rightBarButtonItem setEnabled:NO];

    // set vehicle defaults to -1 and make disable add buttom
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setInteger:-1 forKey:@"vehicleIndex"];
    [defaults synchronize];
    NSLog(@"set index to -1");
}

Answer 1

这可能与核心数据自动生成的访问者中已知的有关一对多关系的错误有关。

rdar://10114310

在解决此问题之前，您需要为缺少的访问者提供自己的实现。

查看this question

的答案

核心数据崩溃 - 无法识别的选择器

1 个答案: