为什么我不能在 Xcode 8 中使用新的内联 #imageLiteral 语法？“返回结果中的预期表达式”
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Why can't I use the new inline #imageLiteral syntax in Xcode 8? "Expected expression in return result"
提问by Doug Smith
I'm trying to use the new #imageLiteralinline image assignment from your assets folder in Xcode 8, where instead of the whole UIImage(named: "")syntax it's just the image displayed, as shown here.
我正在尝试使用#imageLiteralXcode 8 中资产文件夹中的新内联图像分配，其中UIImage(named: "")仅显示图像而不是整个语法，如下所示。
But when I do, I get the error "Expected expression in return result" when it's a function.
但是当我这样做时，当它是一个函数时，我会收到错误“返回结果中的预期表达式”。
Here's a simple example:
这是一个简单的例子：
func img() -> UIImage {
return #imageLiteral(resourceName: "small-checkmark")
}
Where in Xcode it displays the small-checkmarkas would be expected, but it won't compile due to the above error. Everything is autocompleted for me, the file is in the assets folder (a PDF). I don't understand what's going wrong. If I just return UIImage()it compiles fine.
它在 Xcode 中的哪个位置small-checkmark按预期显示，但由于上述错误而无法编译。一切都为我自动完成，文件位于资产文件夹（PDF）中。我不明白出了什么问题。如果我只是返回UIImage()它编译正常。
What should I be doing?
我该怎么办？
采纳答案by Kentaro Matsumae
You should check Swift Version.
您应该检查 Swift 版本。
Build Settings > Use Legacy Swift Language Version = NO
Image Literal is only supported on Swift3.0, not Swift2.3.
Image Literal 仅支持 Swift3.0，不支持 Swift2.3。
回答by LukeSideWalker
For all having the same problem with Xcode 10 / Swift 4.2 -> Unfortunately, this feature (imageLiterals, auto completion ) was deprecated in its previous form.
对于所有在 Xcode 10 / Swift 4.2 中遇到相同问题的人 -> 不幸的是，此功能（imageLiterals，自动完成）在其以前的形式中已被弃用。
But there is new way to use imageLiterals -> https://stackoverflow.com/a/52523111/3143890
但是有使用 imageLiterals 的新方法 -> https://stackoverflow.com/a/52523111/3143890
