如何在UIAlertView中更改消息的對齊？

Question

當我使用UIAlertView時，我發現消息的textAligment是Center。 例如，當我寫這段代碼時：

    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：
正如我們所看到的，文本“這是第一行”位於中心，但我想將其更改為left.I知道UILabel可以更改文本的對齊方式，但我不知道是否可以在UIAlertView中更改它。

Answer 1

像這樣編輯你的代碼。

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];

Answer 2

iOS7：對於左對齊，您可以這樣做：

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;
    }
}

參考： 如何制作多行，左對齊的UIAlertView？

或者您可以將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];

參考： 如何僅在UIAlertView中對齊標題