将未包装的引用传递给Objective C初始化程序的问题

Question

PhotoCollectionViewDelegate有初始化 -

-(instancetype)initWithController:(MyViewController *)controller {
    self = [super init];
    if(self) {
        self.myViewController = controller;
    }
    return self;
}

从MyViewController.swift文件中调用

let photoCollectionViewDelegate = PhotoCollectionViewDelegate(controller : self)

gives 'Can not convert value of type MyViewController to expected argument type 'MyViewController!'

即PhotoCollectionViewDelegate(controller : MyViewController!)，但self与之呼叫MyViewController。

Answer 1

这可能很愚蠢，但你试过了吗？

let photoCollectionViewDelegate = PhotoCollectionViewDelegate(controller : self as MyViewController!)

Answer 2

试一试：

let optionalSelf = self as MyViewController!
let wrappedSelf = optionalSelf ?? nil
let photoCollectionViewDelegate = PhotoCollectionViewDelegate(controller : wrappedSelf)