我正在尝试设置文本以适应a的大小UILabel并且也居中.我是以编程方式执行此操作.这就是目前的样子:

如您所见,文本离开屏幕也没有居中.
这是我的代码:
let questions = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec ac faucibus tellus."
questionsLabel = UILabel(frame: CGRectMake(10, 10, questionsView.frame.size.width - 20, 80))
questionsLabel.text = questions
questionsLabel.font = UIFont(name: Font.FuturaMedium, size: 25)
questionsLabel.sizeToFit()
questionsLabel.numberOfLines = 0
questionsLabel.textAlignment = NSTextAlignment.Center
questionsView.addSubview(questionsLabel)
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我究竟做错了什么?