问题描述
你好StackOverflow:)
Hello StackOverflow :)
自从我升级到Swift 2.0以来，我一直遇到一个奇怪的问题
I've been running into a weird problem since I upgraded to swift 2.0
我正在尝试设置边框颜色，所以我在写self.layer.borderColor = borderColor as! CGColor，其中borderColor是AnyObject，而self.layer.borderColor是CGColor?
I'm trying to set a border color, so I'm writing self.layer.borderColor = borderColor as! CGColor where borderColor is an AnyObject, while self.layer.borderColor is a CGColor?
如果我写self.layer.borderColor = borderColor as! CGColor我会收到警告
，建议改为使用as?
如果我改写self.layer.borderColor = borderColor as? CGColor，我会收到错误消息
If I instead write self.layer.borderColor = borderColor as? CGColor I get the error
只是为了确保我没有丢失任何东西，我还尝试编写container.layer.borderColor = borderColor as CGColor和container.layer.borderColor = borderColor这两个都给出了以下错误:
Just to make sure I wasn't missing something I also tried writing container.layer.borderColor = borderColor as CGColor and container.layer.borderColor = borderColorBoth of these gave the following error:
仅在使用as!时运行XCode给出的警告并不是那么糟糕，但是我希望保持我的代码不受警告.因此，我真的需要您的帮助.这是我不了解的事情，还是我应该报告的Swift 2.0中的错误.
Just running with the warning given by XCode when using as! is not all that terrible, but I would prefer to keep my code warning free. To avhieve that I really need your help SO. Is this something I'm not understanding or is it simply a bug in Swift 2.0 that I should instead report.
干杯！
Jacob
推荐答案
xcode还给了我以下提示:
xcode also gives me the following hint:
好吧...当xcode这么说的时候...
well... when xcode says so...
layer.borderColor = (borderColor as! CGColor)
这篇关于从AnyObject投射到CGColor?没有错误或警告的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！