问题
Whenever I download an image from Firebase Storage it download's perfectly, but once I try to change the imageview "my" to it, the imageview disappears. I don't have constraints and I navigated to the local URL and found the image perfectly there. Any help? Am I doing something wrong?
func loadImages(){
let documentDirectoryURL = try! NSFileManager.defaultManager().URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true)
let newRef = storageRef!.child("Images/0.jpg")
let fileDestinationUrl = documentDirectoryURL.URLByAppendingPathComponent("p.jpg")
let downloadTask = newRef.writeToFile(fileDestinationUrl){ (URL, error) -> Void in
if (error != nil) {
print("problem")
} else {
print("done")
}
}
downloadTask.observeStatus(.Success) { (snapshot) -> Void in
print(fileDestinationUrl)
var temp = String(fileDestinationUrl)
print(temp)
var my = UIImage(contentsOfFile: temp)
self.image.image = my
}
}
回答1:
Print the destinationUrl in your console .Go to your downloaded file location , open your terminal , drag and drop the DOWNLOADED image in the terminal and the terminal will give you its actual path.Now compare both the path the one that terminal gave you and the one that console gave you, match those. most like they are to be different ,change them accordingly.
Example code :-
Uploading Code : -
func profilePictureUploading(infoOnThePicture : [String : AnyObject],completionBlock : (()->Void)) {
if let referenceUrl = infoOnThePicture[UIImagePickerControllerReferenceURL] {
print(referenceUrl)
let assets = PHAsset.fetchAssetsWithALAssetURLs([referenceUrl as! NSURL], options: nil)
print(assets)
let asset = assets.firstObject
print(asset)
asset?.requestContentEditingInputWithOptions(nil, completionHandler: { (ContentEditingInput, infoOfThePicture) in
let imageFile = ContentEditingInput?.fullSizeImageURL
print("imagefile : \(imageFile)")
let filePath = FIRAuth.auth()!.currentUser!.uid + "/\(Int(NSDate.timeIntervalSinceReferenceDate() * 1000))/\(imageFile!.lastPathComponent!)"
print("filePath : \(filePath)")
FIRControllerClass.storageRef.child("ProfilePictures").child(filePath).putFile(imageFile!, metadata: nil, completion: { (metadata, error) in
if error != nil{
print("error in uploading image : \(error)")
}
else{
print("metadata in : \(metadata!)")
print(metadata?.downloadURL())
print("The pic has been uploaded")
print("download url : \(metadata?.downloadURL())")
self.uploadSuccess(metadata!, storagePath: filePath)
completionBlock()
}
})
})
}else{
print("No reference URL found!")
}
}
Downloading code : -
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
print("paths in user home page : \(paths)")
let documentDirectory = paths[0]
print("documents directory in homePage : \(documentDirectory)")
let filePath = "file:\(documentDirectory)/\(user!.uid).jpg"
var filePath2 : String = filePath
print(filePath)
let storagePath = NSUserDefaults.standardUserDefaults().objectForKey("storagePath") as! String
print("storagePath is : \(storagePath)")
storageRef.child("ProfilePictures").child(storagePath).writeToFile(NSURL.init(string: filePath)! , completion :
{ (url, err) -> Void in
if let error = err{
print("error while downloading your image :\(error)")
}else{
print("Download successful !")
print("the file filePath of the downloaded file : \(filePath)")
filePath2 = "\(documentDirectory)/\(self.user!.uid).jpg"
if let downloadedImage = UIImage(contentsOfFile: filePath2){
self.profilePictureImageView.image = downloadedImage
print("displayed")
}else{
print("unable to display")
}
}
})
where storagePath is something that you stored in your NSUserDefaults for later reference , such as this, while uploading your image to your firebase storage
The codeBlocks that i gave you are just one of many solutions, there are plenty of ways to do this, go to https://firebase.google.com/docs/storage/ios/download-files
来源：https://stackoverflow.com/questions/37510771/downloading-image-on-swift-2-form-firebase-storage