swift - 如何从 NSArray 中删除重复的对象？

Question

我有 NSArray()，它包含名称，但有重复的名称，我该如何删除它们？

在解析查询后将对象添加到 NSArray 及其副本

var names = NSArray()
let query = PFQuery(className: "test")
        query.whereKey("receivers", equalTo: PFUser.currentUser()!.username!)

        query.findObjectsInBackgroundWithBlock {
            (objects, error) -> Void in

            if error == nil {

                self.names = objects!
                let set = NSSet(array: self.names as [AnyObject])

                print(objects!.count)
                // count is 4
                // database looks like this (justin , kevin , kevin , joe)

Answer 1

如果您的名称是字符串，您可以从数组创建 NSSet，它只会有不同的名称。

let names = ["John", "Marry", "Bill", "John"]
println(names)

let set = NSSet(array: names)
println(set.allObjects)

打印:

"[John, Marry, Bill, John]"
"[Bill, John, Marry]"

更新#1
对于有问题的新信息(代码片段)，它可能看起来像这样

var set = Set<String>()
for test in objects as [Test] {
    set.insert(test.sender)
}
self.names = Array(set)