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我有以下带有NumericType T的swift类.

@objc class MathStatistics<T: NumericType> : NSObject {
        var numbers = [T]()

        func sum() -> T? {
            if numbers.count == 0 {
                return nil
            }

            var sum = T(0)

            for value in numbers {
                sum = sum + value
            }
            return sum
        }
    }

在swift中,初始化类对象如下:

let statistics = MathStatistics<Double>()

如何在Objective C中初始化相同的对象？以下行未设置数字类型T.

MathStatistics *stats = [[MathStatistics alloc] init];