[英]Accessing protocol property in Swift class
I am trying to use a protocol to pass an array from one class to another. 我正在尝试使用协议将数组从一个类传递到另一个类。
protocol PinsArray {
var dataArray: [LocationPost] {get set}
}
When I am trying to create a delegate in class, which should receive it does not work. 当我尝试在类中创建一个委托时,该委托将无法正常工作。 I cannot access the property
我无法访问该物业
var delegate = PinsArray.self
Like this: 像这样:
delegate.dataArray
It says that "instance member 'dataArray' cannot be used on type PinArray" 它说“实例成员'dataArray'不能在类型PinArray上使用”
So what do I do wrong? 那我该怎么办呢?
You are assigning the type of PinsArray
to delegate
instead of assigning an instance of a class that conforms PinsArray
. 您正在分配
PinsArray
的类型来delegate
而不是分配符合PinsArray
的类的实例 。 You would need to implement an a class that conforms to PinsArray
and assign an instance of that class to delegate. 您将需要实现一个符合
PinsArray
的类,并将该类的实例分配给委托。 See the following example: 请参见以下示例:
class SomeClass: PinsArray {
var dataArray: [LocationPost]
// ...
}
You would use the class above to create an instance of an object that conforms to PinsArray
. 您将使用上面的类创建符合
PinsArray
的对象的实例。
var delegate = SomeClass()
Then you could use: 然后,您可以使用:
delegate.dataArray
我用错别字声明了委托,它应该像这样:
var delegate: PinsArray?
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