Swift语言中的NSClassFromString

Question

Swift语言中的NSClassFromString

89

如何在Swift语言中实现反射(reflection)？

如何实例化一个类？

[[NSClassFromString(@"Foo") alloc] init];

- Selvin

1

尝试这样写：如果让 ImplementationClass: NSObject.Type = NSClassFromString(className) as? NSObject.Type{ ImplementationClass.init() } - Pushpa Raja

25个回答

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- Himanshu · Answer 1

尝试一下。

let className: String = String(ControllerName.classForCoder())
print(className)

- black_pearl · Answer 2

Swift 5，易于使用，感谢 @Ondrej Rafaj 的贡献。

Source code:

extension String {
     fileprivate
     func convertToClass<T>() -> T.Type? {
          return StringClassConverter<T>.convert(string: self)
     }


    var controller: UIViewController?{
          guard let viewController: UIViewController.Type = convertToClass() else {
            return nil
        }
        return viewController.init()
    }
}

class StringClassConverter<T> {
     fileprivate
     static func convert(string className: String) -> T.Type? {
         guard let nameSpace = Bundle.main.infoDictionary?["CFBundleExecutable"] as? String, let aClass = NSClassFromString("\(nameSpace).\(className)") as? T.Type else {
             return nil
        }
         return aClass

   }

}

Call like this:

guard let ctrl = "ViewCtrl".controller else {
    return
}
//  ctrl do sth

- SeRG1k · Answer 3

Swift3+

extension String {

    var `class`: AnyClass? {

        guard
            let dict = Bundle.main.infoDictionary,
            var appName = dict["CFBundleName"] as? String
            else { return nil }

        appName.replacingOccurrences(of: " ", with: "_")
        let className = appName + "." + self
        return NSClassFromString(className)
    }
}

- Tim · Answer 4

这里展示了一个页面跳转的例子，希望能够帮助你！

let vc:UIViewController = (NSClassFromString("SwiftAutoCellHeight."+type) as! UIViewController.Type).init()
self.navigationController?.pushViewController(vc, animated: true)

// Click the Table response
tableView.deselectRow(at: indexPath, animated: true)
let sectionModel = models[(indexPath as NSIndexPath).section]
var className = sectionModel.rowsTargetControlerNames[(indexPath as NSIndexPath).row]
className = "GTMRefreshDemo.\(className)"
if let cls = NSClassFromString(className) as? UIViewController.Type {
   let dvc = cls.init()
   self.navigationController?.pushViewController(dvc, animated: true)
}

- EvilPenguin · Answer 5

这里有一个很好的例子：

class EPRocks { 
    @require init() { } 
}

class EPAwesome : EPRocks { 
    func awesome() -> String { return "Yes"; } 
}

var epawesome = EPAwesome.self(); 
print(epawesome.awesome);