ios - 从对象中解析特定字段

Question

我正在尝试从 objects 中提取 prayerRequest。但是，我不确定如何完成此操作。

var allPrayerRequests = [""]

override func viewDidLoad() {
    super.viewDidLoad()
    var query = PFQuery(className: "PrayerRequests")
    query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
        if error == nil {
            if let objects = objects as? [PFObject] {
                for object in objects {
                    println(object)
                }
            }
        }
    })
}

如果我这样做，println(object)，我会得到以下输出:

<PrayerRequests: 0x7feec8eec7f0, objectId: jy2KwGXenC, localId: (null)> {
    ACL = "<PFACL: 0x7feec8eca220>";
    prayerRequest = qoiejr;
}
<PrayerRequests: 0x7feec8eed9a0, objectId: KxMpxyWV0P, localId: (null)> {
    ACL = "<PFACL: 0x7feec8eed600>";
    prayerRequest = qwer;
}
<PrayerRequests: 0x7feec8eee5f0, objectId: DRHBwJpq16, localId: (null)> {
    ACL = "<PFACL: 0x7feec8eee840>";
    prayerRequest = zxcv;
}
<PrayerRequests: 0x7feec8eeecd0, objectId: cOOdOyv4TM, localId: (null)> {
    ACL = "<PFACL: 0x7feec8eeef10>";
    prayerRequest = oijg;
}
<PrayerRequests: 0x7feec8eef3c0, objectId: bmO3oVKUDG, localId: (null)> {
    ACL = "<PFACL: 0x7feec8eef680>";
    prayerRequest = asdf;
}
<PrayerRequests: 0x7feec8eef800, objectId: RcR3wbbMYv, localId: (null)> {
    ACL = "<PFACL: 0x7feec8eefda0>";
    prayerRequest = qwer;
}

因此，正如您在代码中看到的那样，有一个带有 prayerRequest 的字段。我希望能够提取这个字段，就像我要执行 println(object.objectId) 一样，它将以下内容输出到控制台:

Optional("jy2KwGXenC")
Optional("KxMpxyWV0P")
Optional("DRHBwJpq16")
Optional("cOOdOyv4TM")
Optional("bmO3oVKUDG")
Optional("RcR3wbbMYv")

但只有 prayerRequest 字段。任何人都有办法实现这一目标吗？

Answer 1

PFObject 包含 JSON 兼容数据的键值对。要获得任何值，您需要使用 objectForKey。

所以你可以将它提取为 -

object.objectForKey("prayerRequest")