“UIFont"不能转换为“UIFont?" [英] 'UIFont' is not convertible to 'UIFont?'

问题描述

所以我今天晚上将我的 XCode 更新到了 7.3.

So I had updated my XCode to 7.3 today evening.

在我的一个项目中，设置字体的几个标签出现以下错误:

In one of my projects, I get the following error for few labels where I set the font:

'(name: String, size: CGFloat) -> UIFont' is not convertible to '(name: String, size: CGFloat) -> UIFont?'

这是我在导航栏中标题视图的代码:

This is my code for Title View in Navigation Bar:

let aTitleFrame: CGRect = CGRectMake(0, aHeaderTitleSubtitleView.frame.midY / 2, 200, 24)
let aTitleView: UILabel = UILabel(frame: aTitleFrame)
aTitleView.backgroundColor = UIColor.clearColor()
aTitleView.font = UIFont(name: "Roboto-Regular", size: 15) // ERROR POPS UP HERE
aTitleView.textAlignment = NSTextAlignment.Center
aTitleView.textColor = UIColor.whiteColor()

这是我的 UILabel 属性字符串代码:

This is my code for an Attributed String for a UILabel:

let aAttributedFundLabel: NSMutableAttributedString = NSMutableAttributedString(string: "Raising\n$ \(fund)")
aAttributedFundLabel.addAttribute(NSForegroundColorAttributeName, value: UIColor.darkGrayColor(), range: NSRange(location: 0, length: 7))
aAttributedFundLabel.addAttribute(NSFontAttributeName, value: UIFont(name: "Roboto-Regular", size: 15)!, range: NSRange(location: 0, length: 7)) // ERROR POPS UP HERE 
aAttributedFundLabel.addAttribute(NSForegroundColorAttributeName, value: UIColor.blackColor(), range: NSRange(location: 8, length: fund.characters.count + 2))
aAttributedFundLabel.addAttribute(NSFontAttributeName, value: UIFont(name: "Roboto-Regular", size: 16)!, range: NSRange(location: 8, length: fund.characters.count + 2)) // ERROR POPS UP HERE
startupFund.attributedText = aAttributedFundLabel

这仅发生在我整个项目的两个文件中.

This happens only in two files in my entire project.

我打开了另一个项目，但我能够在没有任何错误的情况下构建和运行它，即使我也在那里为多个标签设置了字体.

I opened up another project, but I was able to build and run it without any errors, even though I do set the font for multiple labels there as well.

知道为什么会这样吗?

TIA！

推荐答案

在 SO 的其他地方，有人建议你在哪里有这个:

Elsewhere on SO, someone suggest that where you have this:

aTitleView.font = UIFont(name: "Roboto-Regular", size: 15)

...你应该试试写这个:

...you should try writing this:

aTitleView.font = UIFont.init(name: "Roboto-Regular", size: 15)

我不能为此相信(因为我无法重现错误)所以我只是猜测！但知道它是否真的有效会很有趣.

I can take no credit for this (because I can't reproduce the bug) so I'm just guessing! But it would be very interesting to know if it actually works.

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