Append UI Images from array to slideshow swift

Question

I'm trying to make a slideshow with this library

https://github.com/zvonicek/ImageSlideshow

So i'm making a query, i bring some images and i append them here

var sliderArray = [UIImage]()
var testimg:UIImage!

let idaki = recipeObj.objectId
let pointer2 = PFObject(outDataWithClassName:"Recipes", objectId: idaki!)
let galquery = PFQuery(className:"sliderRecipes")
galquery.whereKey("recipe", equalTo: pointer2)
galquery.findObjectsInBackgroundWithBlock {
    (objects: [PFObject]?, error: NSError?) -> Void in


    if error == nil {
        // The find succeeded.
        print("Successfully retrieved \(objects!.count) scores.")
        // Do something with the found objects
        if let objects = objects {
            for object in objects {
                count += 1

                let glrimg = object["sliderImage"] as! PFFile
                glrimg.getDataInBackgroundWithBlock {
                    (imageData3: NSData?, error: NSError?) -> Void in
                    if error == nil {
                        if let imageData2 = imageData3 {
                            self.testimg = UIImage(data:imageData2)
                            print(self.testimg)
                            print(self.sliderArray)
                            self.sliderArray.append(UIImage(data:imageData2)!)




                        }
                        if count == objects.count { print(self.sliderArray) }
                    }
                }



                // print("test")
                // print(self.sliderPinakas)
            }
        }
    } else {
        // Log details of the failure
        print("Error: \(error!) \(error!.userInfo)")
}

And after all this i DONT have an array with images. In the print above it first shows the empty array and after that it shows the prints of UI Images that i want to show them like this to a slider

slideshow.setImageInputs([ImageSource(image: UIImage(named: "myImage"))!, ImageSource(image: UIImage(named: "myImage2"))!])

but instead of having to do it with the name, UIImage(named: "myImage"))! i would like to do it this way

self.slider.setImageInputs([ImageSource(image: self.testimg)])

for all the images of the array, cause the above line shows only one. Is there anyone that could help? Thanks!

Igor · Accepted Answer · 2016-07-12 21:30:25Z

1

You have pass to self.slider.setImageInputs array of all objects ImageSource [ImageSource(image: self.testimg1), ImageSource(image: self.testimg2), ...] etc., not only one object [ImageSource(image: self.testimg)].

If you add images like:
self.slider.setImageInputs([ImageSource(image: self.testimg)])
self.slider.setImageInputs([ImageSource(image: self.testimg2)])
you'll simply replace first image with second.

Create new array, enumerate all images from sliderArray, and append they to array ImageSource(image: self.testimg1) objects.

Also remember, you have to call this from block glrimg.getDataInBackgroundWithBlock!

add before for

var count = 0

and add inside block

count +=1
if count == objects.count {
    print(self.sliderArray)
}.

That will print array when all objects finished loads (they can loads in chaotic order).

edited Jul 12, 2016 at 21:30

answered Jul 12, 2016 at 20:09

Igor

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16 Comments

Konstantinos Natsios Over a year ago

could you see any issue of the first sliderArray ? Because i append images but it shows me an emty array after all

Igor Over a year ago

and where you declare self.testimg?

Igor Over a year ago

What do you get from print("Successfully retrieved \(objects!.count) scores.")?

Igor Over a year ago

from print(self.testimg)?

Konstantinos Natsios Over a year ago

i get the UIImage that is being downloaded from parse. Although it prints first the array and then the images... that means that it didnt have the time to append them !

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