如何在UIAlertView中更改消息的对齐方式？

Question

当我使用UIAlertView时，我发现消息的textAligment是Center。例如，当我写这篇文章的代码：

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

效果如下：
正如我们看到的，文本“这是第一行”是在中央，但我想将其更改为left.I知道UILabel可以改变文本的对齐方式，但我不知道是否可以在UIAlertView中进行更改。

Answer 1

iOS7：对于左对齐，你可以这样做：

NSArray *subViewArray = alertView.subviews; 
for(int x = 0; x < [subViewArray count]; x++){ 

    //If the current subview is a UILabel... 
    if([[[subViewArray objectAtIndex:x] class] isSubclassOfClass:[UILabel class]]) { 
     UILabel *label = [subViewArray objectAtIndex:x]; 
     label.textAlignment = NSTextAlignmentLeft; 
    } 
} 

编号：How to make a multiple line, left-aligned UIAlertView?

或者你也可以一个的UILabel添加到alertView：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Centered Title" message:@"\n\n\n" delegate:self cancelButtonTitle:@"Close" otherButtonTitles:nil]; 

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(12.0, 24.0, 250.0, 80.0)]; 
    label.numberOfLines = 0; 
    label.textAlignment = NSTextAlignmentLeft; 
    label.backgroundColor = [UIColor clearColor]; 
    label.textColor = [UIColor whiteColor]; 
    label.text = @"Here is an example of a left aligned label in a UIAlertView!"; 
    [alert addSubview:label]; 
    [alert show]; 

编号：How to align only the title in UIAlertView

Answer 2

像这样编辑你的代码。

UIAlertView *alert = [[UIAlertView alloc]initWithTitle:nil 
               message:nil 
               delegate:nil 
            cancelButtonTitle:nil 
            otherButtonTitles:nil, nil]; 


UILabel *v = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 80, 40)]; 
v.text = NSTextAlignmentLeft; 
v.numberOfLines = 0; 
v.text = @"this is first line\nsecondLine should be center"; 
[alert setValue:v forKey:@"accessoryView"]; 
[alert show];