问题描述
我目前正在尝试使用Swift开发音乐应用.这是我的第一个应用程序(不算几个教程的内容).我一直在看一些示例代码，包括Apple的addMusic示例，并且在将目标c代码转换为swift时遇到了以下问题:
I am currently trying to make a music app using swift. This is my first app (not counting a couple tutorial things). I've been looking at some sample code, including Apple's addMusic example, and I have had issues with the following translation of the objective c code into swift:
class ViewController: UIViewController <MPMediaPickerControllerDelegate> {
我收到错误消息无法专门化非通用类型'UIViewController'.是否有一种方法可以使我丢失，或者我需要定义一个单独的类作为我的选择器委托?
I get the error "Cannot specialize non-generic type 'UIViewController'. Is there a way to do this that I am missing or will I need to define a separate class to be my picker delegate?
我正在查看的addMusic代码为此处.
The addMusic code I was looking at is here.
推荐答案
与Objective-C不同，子类和委托的结构彼此相同，且周围没有<>".例如:
unlike in objective-c, the subclasses and delegates are structured the same as each other with none of the "<>" around them. For example:
class ViewController: UIViewController, MPMediaPickerControllerDelegate, UITableViewDelegate, CustomClassDelegate
您可以继续添加到列表中，尽管只有一个类可以是超类(其余的必须是委托或类似的类)，因为一个类不能同时是两个不同父类的子类.
You can continually add to the list as you go along, though only one of them can be the superclass (the rest must be delegates or similar) as a class cannot be the subclass of two different parent classes at the same time.
希望有帮助.
这篇关于迅速地，有没有办法让UIView类也成为MPMediaPickerControllerDelegate?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！