问题描述
我有一个项目 A，我开始使用 Swift1-Xcode6 编写它.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 并将这些扩展文件复制到其中.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，但 Project-B 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
这可能是因为您在桥接头中导入了一些 Objective-C 框架，而这些框架恰好在其 .h 文件中导入了 UIKit - 它会自动将 UIKit 导入到您的所有Swift 类
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
这篇关于需要导入 UIKit 的新项目文件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编程学习网！