objective-c - 在 Swift 中初始化 NSDictionary 时出现问题

Question

我一直在努力尝试从 Objective-C 翻译这段代码

NSDictionary * options = [NSDictionary dictionaryWithObject:[NSNumber numberWithInteger:UIPageViewControllerSpineLocationMid] forKey:UIPageViewControllerOptionSpineLocationKey];

...到Swift

var options:NSDictionary = NSDictionary.dictionaryWithObjects(UIPageViewControllerSpineLocation.Mid, forKeys: UIPageViewControllerOptionSpineLocationKey, count: 0);

不幸的是它不起作用，我不知道为什么! 以下是 XCode 的输出报告:

Cannot invoke 'dictionaryWithObjects' with an argument list of type '(UIPageViewControllerSpineLocation, for keys: NSString!, count: IntegerLiteralConvertible)'

有人可以帮助我吗？ 谢谢

Answer 1

就这样怎么样

    let options = [UIPageViewControllerOptionSpineLocationKey: UIPageViewControllerSpineLocation.Mid];`

---

您面临的问题是构造函数 NSDictionary.dictionaryWithObjects -- a) 不存在，b) 枚举不是 AnyObject，c) 计数为 0 但应该为 1

    let o = UIPageViewControllerSpineLocation.Mid.toRaw() //toRaw makes it conform to AnyObject
    let k = UIPageViewControllerOptionSpineLocationKey
    let options = NSDictionary(object: o, forKey: k)