swift - 在 Swift 中创建运行时已知类的实例

Question

一图胜千言，这段代码如何从Objective-C改写成Swift？

- (id) instanceOfClass: (Class) class withInitializer: (SEL) initializerSelector withObject: (id) object {
    id obj = nil;
    if([class instancesRespondToSelector:initializerSelector]) {
        obj = [[class alloc] performSelector:initializerSelector
                                  withObject:object];
    }
    return obj;
}

id myViewController = [self instanceOfClass:[ViewController class]
                              withInitializer:@selector(initWithObject:)
                                   withObject:@"super-string!"];
NSLog(@"%@", myViewController);

Answer 1

这不能纯粹在 Swift 中完成。您只能通过在 Objective C 中创建“按名称创建者的类实例”并从 Swift 调用此代码来完成此操作。

有关更多信息，您可以阅读本文。 http://ijoshsmith.com/2014/06/05/instantiating-classes-by-name-in-swift/

并查看这个 github 存储库 https://github.com/ijoshsmith/swift-factory