如何下载 Firebase 存储空间文件

Question

截至目前，我正在使用当前在我的资产文件夹中的图像，它肯定会产生内存/应用程序大小问题。

我将照片上传到Firebase存储的相关存储参考中，现在我有点纠结于如何从此处从存储中下载每张图像。

这是我当前的代码

// Trend Model
enum Gender { case male, female }
struct Trend {
var name: String
var details: String
var image: UIImage?
var gender : Gender
var childValue: String
}
// Create trend
let femaleTrends = [
Trend(name: "Animal Prints", details: "Details will go here!", image: UIImage(named: "AnimalPrintW"), gender: .female, childValue: "animalprints"),
Trend(name: "Green", details: "Details will go here",image: UIImage(named: "Green"),gender: .female, childValue: "green")
]
let maleTrends = [
Trend(name: "Animal Prints", details: "Details will go here!",image:UIImage(named: "AnimalPrintM"),gender: .male , childValue: "animalprints"),
....
]

这是另一个视图控制器，它保存显示趋势列表的集合视图

//Display the current trend image place holder and labels
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "homeViewCell", for: indexPath) as! CurrentTrendsCell
switch selectedSegmentIndex {
case 0: cell.trendsLabel.text = femaleTrends[indexPath.row].name
cell.trendsImageView.image = femaleTrends[indexPath.row].image

case 1: cell.trendsLabel.text = maleTrends[indexPath.row].name
cell.trendsImageView.image = maleTrends[indexPath.row].image
default: break
}
return cell

}

我通读了Firebase存储文档并尝试了一些练习代码

let animalPrintRef = STORAGE_FEMALETREND_IMAGES_REF.child("AnimalPrints.jpeg").getData(maxSize: 1) { (data, error) in
if let error = error {
// Uh-oh, an error occurred!
} else {
// AnimalPrints.jpeg" is returned
// This is the image I need
let image = UIImage(data: data!)
}
}

我理解它，但我不确定如何获取每个trend的图像数据并将其实施到image中Trend

Answer 1

使用 Firebase 存储来保存图片，并将图片链接放入您的数据库中。

typealias blockCompletedWith = (Bool, String) -> Void
func uploadProfileImage(_ image: UIImage) {
let imageData = image.jpegData(compressionQuality: 1.0)
let path = "folderName/imagename.jpeg"
self.uploadImageToFirebaseStorage(data: imageData!, path: path, blockCompletedWith: { (isSuccess, urlStr) in
Utility.stopActivityIndicator()
DispatchQueue.main.async {
if isSuccess {
print(urlStr)
}
else {
print("Error in uploading Image")
}
}
})
}

-----------上传图像到火基存储方法------------

//path: folder name if any followed by name of image
func uploadImageToFirebaseStorage(data: Data, path: String, blockCompletedWith: @escaping blockCompletedWith) {
let metadata = StorageMetadata()
metadata.contentType = "image/jpeg"
let store = Storage.storage()
let storeRef = store.reference().child(path)
let _ = storeRef.putData(data, metadata: metadata) { (metadata, error) in
guard let _ = metadata else {
print("error occured: (error.debugDescription)")
blockCompletedWith(false, "")
return
}
storeRef.downloadURL(completion: { (url, error) in
if let urlText = url?.absoluteString {
blockCompletedWith(true, urlText)
}
else {
blockCompletedWith(false, "")
}
})
}
}

在这个功能"上传图像到火基存储"中，您将获得Firebase上传内容的链接，借助该链接，您可以访问上传的内容。

您将获得链接的函数的一部分(您可以将此 url 保存到您的数据库中以供参考(：

storeRef.downloadURL(completion: { (url, error) in
if let urlText = url?.absoluteString {
blockCompletedWith(true, urlText)
}
else {
blockCompletedWith(false, "")
}
})

希望对您有所帮助！

---

如果您手动上传了图像，则可以通过单击该特定内容来获取URL...在右侧将出现一个窗口，您可以在其中获取资源的链接。