关于UITableView横扫删除的问题 [NSMutableArray removeObjectAtIndex]

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    
    if (editingStyle == UITableViewCellEditingStyleDelete) {
       
        [myArray removeObjectAtIndex:indexPath.row];
        
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]  withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
    }   
}


在这里 myArray 是一个数组 是数据成员 并且我已经alloc，但是当我在模拟器中横扫的时候老是在remove那里报错，报的这个错
2011-06-08 16:51:56.989 view[749:207] -[__NSArrayI removeObjectAtIndex:]: unrecognized selector sent to instance 0x4e4b530
2011-06-08 16:51:56.991 view[749:207] *** Terminating app due to uncaught exception "NSInvalidArgumentException", reason: "-[__NSArrayI removeObjectAtIndex:]: unrecognized selector sent to instance 0x4e4b530"

*** Call stack at first throw:

解决办法：

数组应该初始化称NSMutableArray  我定义成NSArray 了

NSMutablearray * myarray = [[NSMutableArray alloc] init];