ios - 对象 Swift 3 的 Realm 唯一值

Question

如何编写 swift3 语法？ Swift3 AnyObject 修改，无功能

swift 2:

  func uniqueValueForObject<U : Equatable>(objectKey: String, paramKey: String, type: U.Type)->[U]{
    var uniqueValues : [U] = [U]()
    for obj in self {

        if let o = obj.valueForKeyPath(forKeyPath: objectKey) {
            o.
            if let v = o.valueForKeyPath(paramKey){

                if(!uniqueValues.contains(v as! U)){
                    uniqueValues.append(v as! U)
                }

            }
        }

    }
    return uniqueValues
}

谁能帮忙写一下swift3吗？

Answer 1

如果这实际上只是将 Realm Swift 2 语法更新为 Swift 3，那么它应该如下所示:

extension Results {
    func uniqueValueForObject<U: Equatable>(objectKey: String, paramKey: String, type: U.Type) -> [U] {
        var uniqueValues: [U] = [U]()
        for obj in self {
            if let o = obj.value(forKeyPath: objectKey) {
                if let v = (o as AnyObject).value(forKeyPath: paramKey) {

                    if !uniqueValues.contains(v as! U) {
                        uniqueValues.append(v as! U)
                    }
                }
            }
        }
        return uniqueValues
    }
}