[英]Swift @objc protocol with optional variable CGFloat?
How can I declare an optional variable of type CGFloat in a @objc protocol
? 如何在
@objc protocol
声明CGFloat类型的可选变量?
I have 我有
@objc protocol MyProtocol: class {
var myvar: CGFloat? { get set }
}
I get the error "Property cannot be a member of an @objc protocol because its type cannot be represented in Objective-C". 我收到错误消息“属性不能成为@objc协议的成员,因为它的类型不能在Objective-C中表示”。
Have you tried 你有没有尝试过
@objc protocol MyProtocol: class {
var myvar: NSNumber? { get set }
}
Then you can make a conversion from NSNumber
to CGFloat
然后,您可以从
NSNumber
转换为CGFloat
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