When I use UIAlertView,I find the message's textAligment is Center. e.g.,When I write this code:　

```
    UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:nil
                                                   message:@"this is first line     \nsecondLine should be center"
                                                  delegate:nil
                                         cancelButtonTitle:nil
                                         otherButtonTitles:nil, nil];
[alertView show];

```

the effect is follow:[![enter image description here](https://i.stack.imgur.com/jrXXF.jpg)](https://i.stack.imgur.com/jrXXF.jpg)  

　　As we see, the text"this is first line" is in the center,but I want to change it to left.I know UILabel can change text's alignment,but I don't know whether can I change it in UIAlertView.