代码之家 › 专栏 › 技术社区 › Suraj Bhujbal

将数据分配给集合视图后从服务器获取数据

alamofire uicollectionview swift ios

Suraj Bhujbal · 技术社区 · 7 年前

我不熟悉swift语言,所以不知道如何解决这个问题。在这里,我尝试使用uicollectionview显示图像。但我没有得到正确的输出,因为它在执行时不会在集合视图上显示任何内容。需要帮助的朋友。

查看Did加载功能

 override func viewDidLoad() {
    super.viewDidLoad()
    ImageGet()
}

集合视图

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    print(defectImages.count) // returns zero value here
    return defectImages.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ImageCell", for: indexPath) as! ImageCell
    cell.image.image = defectImages[indexPath.row]
    return cell
}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    let mainStoryBoard = UIStoryboard(name: "Main", bundle: nil)
    let largeVC = mainStoryBoard.instantiateViewController(withIdentifier: "ImageDisplayVC") as! ImageDisplayVC
    largeVC.imgImage = defectImages[indexPath.row]

    self.navigationController?.pushViewController(largeVC, animated: true)
}

Alamofire获取图像

func ImageGet() {                  
    let imageId = Int(details.id!)
    let para: Parameters = ["imageId": imageId]

    Alamofire.request(URL_IMG_List, method: .post, parameters: para).responseJSON { response in
        if((response.result.value) != nil) {
            let swiftyJsonVar = JSON(response.result.value!)
            if let resData = swiftyJsonVar["data"].arrayObject {
                self.arrRes = resData as! [[String:AnyObject]]
                for index in 0..<self.arrRes.count{
                self.imageData.file_name = self.arrRes[index]["file_name"] as! String              
                self.completeImagePath = self.get_image_path + self.imageData.file_name
                    self.imgpath.append(self.completeImagePath)

                    guard let url = URL(string: self.completeImagePath) else {return}
                    print(url)
                    if let data = try? Data(contentsOf: url) {
                        guard let image: UIImage = UIImage(data: data) else {return}
                        print(image)
                    self.defectImages.append(image as UIImage)
                    }
                }
                print(self.defectImages.count)
            }
        }
    }
}

1 回复 | 直到 7 年前

Pankil 7 年前

您只需重新加载 collectionView 从API获取数据后,请检查是否设置了 集合视图 dataSource 和 delegate 从…起 storyBoard 。如果没有,请在下面的行中写入 viewDidLoad() 之前 ImageGet() 。

self.collectionView.dataSource = self
self.collectionView.delegate = self

用您的代码替换以下代码。

func ImageGet() {                  
    let imageId = Int(details.id!)
    let para: Parameters = ["imageId": imageId]

    Alamofire.request(URL_IMG_List, method: .post, parameters: para).responseJSON { response in
        if((response.result.value) != nil) {
            let swiftyJsonVar = JSON(response.result.value!)
            if let resData = swiftyJsonVar["data"].arrayObject {
                self.arrRes = resData as! [[String:AnyObject]]
                for index in 0..<self.arrRes.count{
                self.imageData.file_name = self.arrRes[index]["file_name"] as! String              
                self.completeImagePath = self.get_image_path + self.imageData.file_name
                    self.imgpath.append(self.completeImagePath)

                    guard let url = URL(string: self.completeImagePath) else {return}
                    print(url)
                    if let data = try? Data(contentsOf: url) {
                        guard let image: UIImage = UIImage(data: data) else {return}
                        print(image)
                    self.defectImages.append(image as UIImage)
                    }
                    self.collectionView.reloadData() // RELOAD COLLECTIONVIEW
                }
                print(self.defectImages.count)
            }
        }
    }
}