小编Tom*_*Fox的帖子

在我能做些什么来解决这个错误,任何想法,我想获得10个随机数字,所以我就可以查询火力一组包含随机数的问题.屏幕截图如下.我还添加了代码......

import UIKit
import Firebase

class QuestionViewController: UIViewController {

var amountOfQuestions = 2

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(true)

    //Use a for loop to get 10 questions
    for _ in 1...10{
        //generate a random number between 1 and the amount of questions you have
        var randomNumber = Int(arc4random_uniform(amountOfQuestions - 1)) + 1

        //The reference to your questions in firebase (this is an example from firebase …

我使用自定义图像选择器来选择时间流逝,我想获取所选时间流逝的网址,以便我可以播放时间流逝.

- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didFinishPickingAssets:(NSArray *)assets {
for (PHAsset *asset in assets) {



    NSURL *url = [NSURL URLWithString: assetURLgoesHere];
    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil];
    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:avAsset];
    AVPlayer *videoPlayer = [AVPlayer playerWithPlayerItem:playerItem];


    [videoPlayer play];

}

[self dismissViewControllerAnimated:YES completion:NULL];
}

这就是我现在所拥有的,但我需要获得资产的网址.

我通常使用swift但这个自定义图像选择器是用objective-c编写的.所以我有点客观 - c菜鸟

更新的代码

- (void)qb_imagePickerController:(QBImagePickerController *)imagePickerController didFinishPickingAssets:(NSArray *)assets {
for (PHAsset *asset in assets) {

    - (PHImageRequestID)requestAVAssetForVideo:(PHAsset *)asset options:(PHVideoRequestOptions *)options resultHandler:(void (^)(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info))resultHandler

    NSURL *url = [NSURL URLWithString: asset];
    AVURLAsset *avAsset = …

我正在尝试查询Firebase以检查是否有任何用户,waiting: "1"然后在返回快照时我想查看它是否等于nil.我试图这样做,但我使用的方法不起作用,如果快照不等于nil,我只有一些输出.我添加了当前的代码和Firebase中的JSON文本.

import UIKit
import Firebase
import Spring

class GamesViewController: UIViewController {

let ref = Firebase(url: "https://123test123.firebaseio.com")
var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()   

@IBAction func StartGamePressed(sender: AnyObject) {
    print("test1")
    var peopleWaiting: [String] = []

    let userRef = Firebase(url:"https://123test123.firebaseio.com/users")
    userRef.queryOrderedByChild("waiting").queryEqualToValue("1")
        .observeEventType(.ChildAdded, withBlock: { snapshot in
            print(snapshot.key)
            if snapshot.key == nil {
                print("test2")
                let userData = ["waiting": "1"]
                let usersRef = self.ref.childByAppendingPath("users")
                let hopperRef = usersRef.childByAppendingPath("\(self.ref.authData.uid)")

                hopperRef.updateChildValues(userData, withCompletionBlock: {
                    (error:NSError?, ref:Firebase!) in
                    if (error != nil) {
                        print("Data could not be …

我正在尝试允许用户通过搜索用户名来启动游戏并关注其他用户.我需要能够确保具有该用户名的用户存在.我正在使用以下代码但是虽然它if被调用但是else它应该被调用.

let checkWaitingRef = Firebase(url:"https://test.firebaseio.com/users")
checkWaitingRef.queryOrderedByChild("username").queryEqualToValue("\(username!)")
            .observeEventType(.ChildAdded, withBlock: { snapshot in

    if snapshot.value.valueForKey("username")! as! String == username! {

    } else {

    }

JSON数据树

{
    "097ca4a4-563f-4867ghj0-6209288bd7f02" : {
        "email" : "test1@tes1.com",
        "uid" : "097ca4a4-563f-4867ghj0-6209288bd7f02",
        "username" : "test1",
        "waiting" : "0"
    },
    "55a8f979-ad0d-438u989u69-aa4a-45adb16175e7" : {
        "email" : "test2@test2.com",
        "uid" : "55a8f979-ad0d-438u989u69-aa4a-45adb16175e7",
        "username" : "test2",
        "waiting" : "0"
    }
}

是否可以仅在通过检索的对象上使用.select（JS）/ selectKeys（Android）.include()？

比如A类有一个指向B类的指针，当我查询A类的时候，我想要的是A类的所有内容和B类的几个选定的字段，这可能吗？

我有一个随机生成的数字数组,然后我尝试查询Firebase的问题,该问题等于所选数字数组中索引[0]的值.目前的问题是我收到了错误Cannot subscript a value of type '[UInt32]'.PS我在swift方面并不是非常有经验,因此精确的代码解决方案会非常苛刻!我还附上了我的火力架结构......

import UIKit
import Firebase

class QuestionViewController: UIViewController {


let ref = Firebase(url: "https://123test123.firebaseio.com/questions")

override func viewDidLoad() {
    super.viewDidLoad()

    // An empty array to hold the selected numbers
    var selectedNumbers: [UInt32] = []

    // A range of acceptable numbers
    let randomNumberRange = 1...10

    // How many numbers are needed?
    let randomNumbersToChoose = 10

    // Crash if asking for more numbers than are available in the range
    assert(randomNumberRange.count >= randomNumbersToChoose, "Must have enough …

我想将活动指示器放在自定义类中，以便可以从任何视图控制器启动/停止它。

以下代码在启动活动指示器但不停止时有效，我该怎么做？

static func activityIndicatorFunction(view: UIView, targetVC: UIViewController, animate: Bool) {

    var activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()

    if animate == false {
        activityIndicator.stopAnimating()
        UIApplication.shared.endIgnoringInteractionEvents()
    } else {
        activityIndicator = UIActivityIndicatorView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        activityIndicator.backgroundColor = UIColor(red:0.16, green:0.17, blue:0.21, alpha:1)
        activityIndicator.layer.cornerRadius = 6
        activityIndicator.center = targetVC.view.center
        activityIndicator.hidesWhenStopped = true
        activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.whiteLarge
        view.addSubview(activityIndicator)
        activityIndicator.startAnimating()
        //UIApplication.shared.beginIgnoringInteractionEvents()
    }
}

启动活动指示器的示例，如果我想停止它，则animate参数将为false。

Utils.activityIndicatorFunction(view: view, targetVC: self, animate: true)

我arc4random用来生成10个随机数,这样我就可以查询firebase来获取包含随机生成数字的问题.问题是我不希望任何数字出现多次,因此没有重复的问题.目前的代码如下......

import UIKit
import Firebase

class QuestionViewController: UIViewController {

    var amountOfQuestions: UInt32 = 40

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.

        // Use a for loop to get 10 questions
        for _ in 1...10{
            // generate a random number between 1 and the amount of questions you have
            let randomNumber = Int(arc4random_uniform(amountOfQuestions - 1)) + 1
            print(randomNumber)
            // The reference to your questions in firebase (this is an example from firebase …