ios Swift：来自类 Error UIViewController 和 UIIMagePickerController 的多重继承
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Swift: Multiple Inheritance from classes Error UIViewController and UIIMagePickerController
提问by cphill
I manually added two additional controllers (UINavigationControllerDelegate& UIImagePickerController) to a UIViewControllerand I am receiving an error after adding the UIImagePickerControllerthat says,
我手动添加了两个额外的控制器 ( UINavigationControllerDelegate& UIImagePickerController) 到 aUIViewController并且在添加后我收到一个错误UIImagePickerController，上面写着，
Multiple inheritance from classes UIViewController and UIImagePickerController
Multiple inheritance from classes UIViewController and UIImagePickerController
I'm not sure how to interpret and fix that right now.
我现在不确定如何解释和解决这个问题。
As a result of this error, I'm also seeing one when I use the image.delegatemethod and set it equal to self
由于此错误，当我使用该image.delegate方法并将其设置为等于时，我也看到了一个错误self
Type ViewController does not conform to protocol UIImagePickerControllerDelegate
Type ViewController does not conform to protocol UIImagePickerControllerDelegate
Code:
代码：
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerController {
@IBAction func pickImage(sender: UIButton) {
var image = UIImagePickerController()
image.delegate = self
image.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
image.allowsEditing = false
self.presentViewController(image, animated: true, completion: nil)
}
回答by rdelmar
You should have UIImagePickerControllerDelegate, not UIPickerViewController in your first line. The system thinks that you are trying to have your controller inherit from both UIViewController and UIImagePickerController which is not allowed.
你的第一行应该有 UIImagePickerControllerDelegate，而不是 UIPickerViewController。系统认为您试图让您的控制器从 UIViewController 和 UIImagePickerController 继承，这是不允许的。
回答by gabbler
I think it is that swift doesn't allow multiple inheritance, protocols are essentially what other languages call interfaces and they serve the same purpose - to allow a safe and limited form of multiple inheritance. Try to change it like this. See more from hereand protocol.
我认为 swift 不允许多重继承，协议本质上是其他语言所称的接口，它们服务于相同的目的 - 允许安全和有限形式的多重继承。试着像这样改变它。从这里和协议中查看更多信息。
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate
