如何从firebase storage Swift 4 ios检索图像
我正在尝试从firebase存储中检索图像,但由于某些原因,我检索的图像始终为如何从firebase storage Swift 4 ios检索图像,ios,swift,database,firebase,storage,Ios,Swift,Database,Firebase,Storage,我正在尝试从firebase存储中检索图像,但由于某些原因,我检索的图像始终为nil var ref: DatabaseReference! var storageRef: StorageReference! var hallData = [Hall]() override func viewDidLoad() { let refHandle = Database.database().reference().child("hallData").observe(DataEventType
nil
var ref: DatabaseReference!
var storageRef: StorageReference!
var hallData = [Hall]()
override func viewDidLoad() {
let refHandle = Database.database().reference().child("hallData").observe(DataEventType.value, with: { (snapshot) in
let postDict = snapshot.value as? [String : AnyObject] ?? [:]
let values = Array(postDict.values)
//print(values)
let valueDict = values as! [[String:Any]]
for i in valueDict
{
var name = i["name"] as! String
var address = i["address"] as! String
var capacity = i["capacity"] as! String
var decorations = i["decorations"] as! String
var highPrice = i["highPrice"] as! String
var lowPrice = i["lowPrice"] as! String
var catering = i["catering"] as! String
var email = i["email"] as! String
self.storageRef = Storage.storage().reference().child("images").child(email)
var image: UIImage!
// Download in memory with a maximum allowed size of 1MB (1 * 1024 * 1024 bytes)
self.storageRef.getData(maxSize: 1 * 1024 * 1024) { data, error in
if let error = error {
print("PLASESEE")
print(error.localizedDescription)
// Uh-oh, an error occurred!
} else {
// Data for "images/island.jpg" is returned
let image = UIImage(data: data!)
}
}
print(image)
self.hallData.append(Hall(name2: name, capacity2: capacity, lowPrice2: lowPrice, highPrice2: highPrice, catering2: catering,decorations2: decorations, address2:address, image2: image, email2: email))
}
})
}
我不明白我做错了什么,我遵循了firebase存储上的api,查阅了很多教程,但我一直得到
nil
问题是您试图在getData闭包之外使用image var
self.storageRef.getData(maxSize: 1 * 1024 * 1024) { data, error in
if let error = error {
print("PLASESEE")
print(error.localizedDescription)
// Uh-oh, an error occurred!
} else {
// Data for "images/island.jpg" is returned
let image = UIImage(data: data!)
} <- closure ends here and image is only valid above this
}
print(image) <- image may not be populated at this point
self.hallData.append... image
}
如果这样做,前面的
var-image:UIImage代码>可以删除,因为它没有函数。否则,请在闭包中删除let before let image=。问题是您试图在getData闭包之外使用image变量
self.storageRef.getData(maxSize: 1 * 1024 * 1024) { data, error in
if let error = error {
print("PLASESEE")
print(error.localizedDescription)
// Uh-oh, an error occurred!
} else {
// Data for "images/island.jpg" is returned
let image = UIImage(data: data!)
} <- closure ends here and image is only valid above this
}
print(image) <- image may not be populated at this point
self.hallData.append... image
}
如果这样做,前面的var-image:UIImage代码>可以删除,因为它没有函数。否则,请在闭包内删除let-before-let image=。嗨,鲍勃。首先,请不要使用大写的单词。@Vyacheslav哦,谢谢你,但是你能给我一个答案吗?你是有错误还是island.png的图像为nil?你创建了一个带有“var image:UIImage!”的图像容器变量。您创建了一个同名的新变量,而不是将图像从getData设置为它。这就是为什么你什么地方都不去抓。另一个问题是var被分配到哪里——在闭包之外。嗨,鲍勃。首先,请不要使用大写的单词。@Vyacheslav哦,谢谢你,但是你能给我一个答案吗?你是有错误还是island.png的图像为nil?你创建了一个带有“var image:UIImage!”的图像容器变量。您创建了一个同名的新变量,而不是将图像从getData设置为它。这就是为什么你什么地方都不去抓。另一个问题是分配var的位置-在闭包之外。