Trying to get an image from parse and set a uiimage with it but keep getting this error. Running Xcode 7 and swift 2.0
Cannot invoke 'getDataInBackgroundWithBlock' with an argument list of type '(imageData:NSData,error:NSError.Type,()->())'
let query: PFQuery = PFQuery(className: "Items")
query.whereKey("ItemOwner", equalTo: "Shreddish")
// 3
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if error == nil {
print("Successfully retrieved: \(objects)")
for object in objects! {
print(object)
let imageFile: PFFile = object["ItemMainImage"] as! PFFile
var image = imageFile.getData()
imageFile.getDataInBackgroundWithBlock(imageData: NSData, error: NSError) {
}
}
} else {
print("Error: \(error) \(error!.userInfo)")
}
}
Change
imageFile.getDataInBackgroundWithBlock(imageData: NSData, error: NSError) {
...
}
To
imageFile.getDataInBackgroundWithBlock {
(imageData: NSData?, error: NSError?) -> Void in
...
}
Related
Ok, I have looked at questions like How do you access an object's fields from a Parse query result in Swift? but the answer is not working in Swift 3. With the following trying to get an image from the first PFObject in Parse I get the error:
Cannot convert value type NSData, NSError -> Void to expected
PFDataResultBlock ?
var query = PFQuery(className: PARSE_CLASS!)
query.order(byDescending: "createdAt")
query.findObjectsInBackground {
(objects, error) -> Void in
if error == nil {
//print(objects?.first?["testTxt"] as! NSString)
//print(objects?.first?["testImg"] as! PFFile)
let thumbnail = objects?.first?["testImg"] as! PFFile
thumbnail.getDataInBackgroundWithBlock{(imageData: NSData?, error: NSError?) -> Void in
if error == nil {
if let image = UIImage(data: imageData!) {
//get image here
}
}
}
}
I have tried changing the type and everything. How can I store an image from Parse in recent Swift?
You can try this:
if let validObjects = objects {
for object in validObjects {
let thumbnail = object["testImg"] as? PFFile
thumbnail?.getDataInBackground (block: { (data, error) -> Void in
//read image here
}
}
}
I'm trying to use this code
if let userPicture = object.valueForKey("Image")! as! PFFile {
userPicture.getDataInBackgroundWithBlock({
(imageData: Data!, error: Error!) -> Void in
if (error == nil) {
let image = UIImage(data:imageData)
self.ImageArray.append(image)
}
})
}
I got this error
Cannot convert value of type '(Data!, Error!) -> Void' to expected
argument type 'PFDataResultBlock?'
I Solved my problem
Swift 3 :
if let userPicture = object.valueForKey("Image")! as! PFFile {
userPicture.getDataInBackground({ (imageData: Data?, error: Error?) -> Void in
let image = UIImage(data: imageData!)
if image != nil {
self.imageArray.append(image!)
}
})
}
What am I doing wrong here? I am stuck. I am making a image posting application. Everything works fine until I post something. When I write a caption and select a image it will not let me post it because of this error. Am I writing the code wrong? Please help!
func loadData() {
let query = PFQuery(className: "Posts")
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock {
(posts: [PFObject]?, error: NSError?) -> Void in
if (error == nil) {
//No error
if let posts = posts as [PFObject]? {
for post in posts {
self.images.append(post["Image"] as! PFFile)
self.imageCaptions.append(post["Caption"] as! String)
self.imageDates.append(post["date"] as! String) // Cannot invoke 'append' with an argument list of type '((String), ())'
self.imageUsers.append(post["addedBy"] as! String)
}
self.tableView.reloadData()
}
} else {
//Error
}
}
}
This is my saving image to parse:
func uploadPost(){
var imageText = self.imageText.text
if (imageView.image == nil){
println("No image uploaded")
}
else{
var posts = PFObject(className: "Posts")
posts["imageText"] = imageText
posts["uploader"] = PFUser.currentUser()
posts.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
if error == nil{
//**Success saving, now save image.**//
// Create an image data
var imageData = UIImagePNGRepresentation(self.imageView.image)
// Create a parse file to store in cloud
var parseImageFile = PFFile(name: "upload_image.png", data: imageData)
posts["imageFile"] = parseImageFile
posts.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
if error == nil{
// Take user home
println("Data uploaded")
}
else{
println(error)
}
})
}
else{
println(error)
}
})
}
}
How can I load the images from parse? This is how my Parse.com "Posts" data looks like:
Any suggestions?
I think maybe something like using this:
self.imageView.sd_setImageWithURL(url, completed: block)
But I don´t know how I get the URL. And what if the images has different names?
try something like this
let imageFile = pfObject["imageFile"] as? PFFile
if imageFile != nil{
imageFile!.getDataInBackgroundWithBlock {
(imageData: NSData?, error: NSError?) -> Void in
if error == nil {
if let imageData = imageData {
self.imageView.image = UIImage(data: imageData)!
}
}
}
}
Where pfObject is the reference to your object. There are other ways you could check for a nil value, but this should work.
As long as you have a reference to the correct object (which you can get via a query for objectId) then you should only need the name of the column the image is file is stored in and not the image file itself.
I'm trying to retrieve images from Parse as PFFiles but the order in which they are returned changes every time. I found another question/answer that addresses this problem but it's in Obj-C and after an hour, I cannot translate a working solution in Swift.
Here's the original thread:
Parse PFFile download order iOS
And here's my code:
func retrieveItemImage() {
var query = PFQuery(className: "Items")
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock { (objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
let imageObjects = objects as! [PFObject]
for object in imageObjects {
let thumbnail = object["image1"] as! PFFile
thumbnail.getDataInBackgroundWithBlock{(imageData: NSData?, error: NSError?) -> Void in
if error == nil {
if let image = UIImage(data: imageData!) {
self.images.append(image)
self.theTableView.reloadData()
}
}
}
}
}
self.theTableView.reloadData()
}
}
I would make it that way:
var images = [Int: UIImage]()
Make it a dictionary, then you get an optional result of subscript and never have an array out of range exception.
Then I would rewrite the part of your code as:
for (index, object) in enumerate(imageObjects) {
let thumbnail = object["image1"] as! PFFile
thumbnail.getDataInBackgroundWithBlock{(imageData: NSData?, error: NSError?) -> Void in
if error == nil {
if let image = UIImage(data: imageData!) {
self.images[index] = image
You never know the order of async operations completion, but your images will be in specified order, or nil in dictionary. You should also correct your tableView methods to check it for nil. Also, in my opinion, reloading the whole table after each image loading is ineffective.