[__NSCFString name]：发送到实例的无法识别的选择器

Question

奇怪的问题，我的应用程序有一个包含三个部分的 UITableView，每个部分由一个单独的数组填充。最终目标是能够将单元格从一个部分移动到另一个部分，所以我在 UITableViewController 中编写了“逻辑”。不幸的是，如果我尝试将一个单元格移动到一个空白部分，它会因错误[__NSCFString name]: unrecognized selector sent to instance 而崩溃。我无法弄清楚我的代码中的缺陷，所以我想我会把它带到这里，而不是花更多时间在错误的方向上进行调试。

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {




    if (sourceIndexPath.section == 0) {
     Athlete *athlete = players[sourceIndexPath.row];
        NSLog(@"sta count: %lu", (unsigned long)[players count]);
        if (athlete != nil) {

        if (destinationIndexPath.section == 1) {
                [players removeObjectAtIndex:sourceIndexPath.row];
                 [benched insertObject:athlete.name atIndex:destinationIndexPath.row];
        }else if (destinationIndexPath.section == 2){

            [players removeObjectAtIndex:sourceIndexPath.row];

                 [reserved insertObject:athlete.name atIndex:destinationIndexPath.row];
        }
        }
    } else if (sourceIndexPath.section == 1) {
    Athlete *athlete = benched[sourceIndexPath.row];
           NSLog(@"Benched count: %lu", (unsigned long)[benched count]);
        if (destinationIndexPath.section == 0) {

            [benched removeObjectAtIndex:sourceIndexPath.row];

            [players insertObject:athlete.name atIndex:destinationIndexPath.row];
        }else if (destinationIndexPath.section == 2){

            [benched removeObjectAtIndex:sourceIndexPath.row];

            [reserved insertObject:athlete.name atIndex:destinationIndexPath.row];
        }
    }else if (sourceIndexPath.section == 2) {
          Athlete *athlete = reserved[sourceIndexPath.row];
           NSLog(@"Res count: %lu", (unsigned long)[reserved count]);
        NSLog(@"From starter");
        if (destinationIndexPath.section == 1) {
            NSLog(@"To bench");
            [reserved removeObjectAtIndex:sourceIndexPath.row];
            [benched insertObject:athlete.name atIndex:destinationIndexPath.row];
        }else if (destinationIndexPath.section == 0){
            NSLog(@"To reserves");
            [reserved removeObjectAtIndex:sourceIndexPath.row];

            [players insertObject:athlete.name atIndex:destinationIndexPath.row];

    }





   /* [players removeObjectAtIndex:sourceIndexPath.row];
    [self.tableView reloadData];
    [players insertObject:athlete.name atIndex:destinationIndexPath.row];*/


    }



}

注意事项：
* 所有的 NSMutableArrays 都是(nonatomic, retain).
* 确切的故障线是[NSMutableArray insertObject:athlete.name atIndex: destinationIndexPath.row];。
* Athlete *athlete 是一个具有 NSString 属性的对象，例如 athlete.name。

Answer 1

错误消息是说您正在尝试在NSString 上调用name 方法。

这意味着您有一个athlete，即NSString，而不是Athlete。

您可以在调试器中检查对象类型或使用NSLog("%@ - %@", [athlete class], athlete) 记录它。