错误:由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:' - [NSCFNumber isEqualToString:]:

Question

在我的应用程序中,我将Amount字段的值输入到textfield中,该字段的数据类型为float,然后将其插入到数据库中.当我运行我的应用程序时,它会出现以下错误.

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:   '-[NSCFNumber isEqualToString:]:

这是我插入数据的代码:

 NSString *amt=txtTotalBill.text;
float amount = [amt floatValue];


NSString *insertData=[NSString stringWithFormat:@"insert into tbl_Bills(Amount) values ('%f')",amount];

并且应用程序在此时给出了错误:

  [label3 setText:[[BillTableArray objectAtIndex:indexPath.row]objectForKey:@"Amount"]];

Answer 1

返回的对象[[BillTableArray objectAtIndex:indexPath.row]objectForKey:@"Amount"]不是NSString.

NSString *string = [NSString stringWithFormat:@"%@", [[BillTableArray objectAtIndex:indexPath.row]objectForKey:@"Amount"]];

[label3 setText:string];