需要导入UIKit的新项目文件 [英] New project files requiring the import of UIKit

问题描述

我有一个项目A，我开始用Swift1-Xcode6编写.我有一些扩展文件，例如:

I have a project A, which I started writing with Swift1-Xcode6. I have some extension files like:

extension UIView {
    convenience init(x: CGFloat, y: CGFloat, w: CGFloat, h: CGFloat) {
        self.init(frame: CGRect(x: x, y: y, width: w, height: h))
    }
}

我创建了一个新项目B，并在其中复制了这些扩展文件.我收到此错误:

I created a new project B and copied these extension files in there. I am getting this error:

UIViewExtensions.swift:11:11: Use of undeclared type 'UIView'

Project-A中的文件不需要包含UIKit，而Project-B中的文件则需要.是什么原因?

Files in Project-A do not need the inclusion of UIKit, but Project-B does. What is the reason?

推荐答案

这可能是由于您在桥接头中导入了一些Objective-C框架而恰好在其.h文件中导入了UIKit-这会自动将UIKit导入到您的所有斯威夫特班

This probably happens because you import some Objective-C Frameworks in your bridging header that happens to import UIKit in its .h file - which automatically imports UIKit to all your Swift classes

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