iOS的UIAlertController大胆的按钮，在8.3改变 [英] iOS UIAlertController bold button changed in 8.3

问题描述

UIAlertController与风格的两个按钮设置：

UIAlertController with two buttons with styles set:

UIAlertActionStyle.Cancel
UIAlertActionStyle.Default

在iOS的8.2，取消按钮是不可大胆默认为粗体。
在iOS 8.3版本，他们已经转向轮

in iOS 8.2, the Cancel button is non-bold and Default is bold. In iOS 8.3 they have switched round

您可以看到苹果自己的应用例如，设置>邮件>添加帐户>的iCloud>输入无效数据，那么就说明这样的8.3：

You can see it Apple's own apps e.g., Settings > Mail > Add Account > iCloud > enter invalid data, then it shows like this on 8.3:

不支持的Apple ID

Unsupported Apple ID

了解更多（粗体）
OK（非粗体）

Learn More (bold) OK (non-bold)

而这是其他方式轮8.2。

whereas it was the other way round for 8.2.

任何解决方法，以使它像8.2试。为什么会改变？

Any workaround to make it like 8.2 again. Why has it changed?

推荐答案

从iOS的9，您可以设置 preferredAction 值设置为你想要的按钮的动作标题要大胆。

From iOS 9 you can set the preferredAction value to the action which you want the button title to be bold.

    let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: nil)
    let OKAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
    alert.addAction(cancelAction)
    alert.addAction(OKAction)
    alert.preferredAction = OKAction
    presentViewController(alert, animated: true) {}

确定按钮，在右侧会以加粗字体。

The OK button which is on the right will be in bold font.

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