我尝试使用字符串以多种方式创建类的实例,但没有一个在Swift 3中工作.
以下是我尝试过的无法正常工作的Swift 3解决方案
– 使课程成为一个客观的课程
- @objc(customClass)
- class customClass {
- ...
- }
- //Error here: cannot convert value of type 'AnyClass?' to expected argument type 'customClass'
- let c: customClass = NSClassFromString("customClass")
– 使用NSString值指定类(使用和不使用@objc属性)
- @objc(customClass)
- class customClass {
- ...
- }
- //Error here: cannot convert value of type 'String' to expected argument type 'AnyClass' (aka 'AnyObject.Type')
- var className = NSStringFromClass("customClass")
- let c: customClass = NSClassFromString(className)
我做的不对,但没有在网上找到任何解决方案.
如何在Swift 3中使用字符串创建类的实例?
你可以试试这个:
- func stringClassFromString(_ className: String) -> AnyClass! {
- /// get namespace
- let namespace = Bundle.main.infoDictionary!["CFBundleExecutable"] as! String;
- /// get 'anyClass' with classname and namespace
- let cls: AnyClass = NSClassFromString("\(namespace).\(className)")!;
- // return AnyClass!
- return cls;
- }
像这样使用func:
- class customClass: UITableView {
- }
- let myclass = stringClassFromString("customClass") as! UITableView.Type
- let instance = myclass.init()