how to load images fast during scrolling in swift 3?

Question

I had implemented a set of images from url and displaying it on collection view and table view and deployed in the iphone 5 device after loading app the images page was not scrolling fast and taking more time delay how to avoid this can anyone help me ?

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return imageArray.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "productsCell", for: indexPath) as! productsCell
    let arr = imageArray[indexPath.row]
    let urls = NSURL(string: arr)
    let data = NSData (contentsOf: urls! as URL) //make sure your image in this url does exist, otherwise unwrap in a if let check
    cell.productImage.image = UIImage(data: data! as Data)
    cell.productName.lineBreakMode = NSLineBreakMode.byWordWrapping
    cell.productName.numberOfLines = 2
    cell.productName.text = self.productName[indexPath.row]
    cell.productPrice.text = self.productprice[indexPath.row]
    cell.buynowButton .addTarget(self, action: #selector(buyNowButton(_:)), for:UIControlEvents.touchUpInside)
    cell.cartButton .addTarget(self, action: #selector(cartButton(_:)), for:UIControlEvents.touchUpInside)
    return cell
}

First you have to download all images in cache and when scrolling at that time get images from cache. It can be memory issue in future. — Shah Nilay, Aug 10 '17 at 06:22
how to download images in cache i don't know i am new to swift 3 ?@NilayShah — , Aug 10 '17 at 06:23
Possible duplicate of [how to implement lazy loading of images in table view using swift](https://stackoverflow.com/questions/28694645/how-to-implement-lazy-loading-of-images-in-table-view-using-swift) — Devang Tandel, Aug 10 '17 at 06:25
pls refer link. It is in Objective C. https://stackoverflow.com/a/14961854/1746086 — Shah Nilay, Aug 10 '17 at 06:25

score 0 · Accepted Answer · answered Aug 10 '17 at 06:28

0

You can use HanekeSwift. It automatically manages caching so your view won't block while loading heavy Images. https://github.com/Haneke/HanekeSwift

Hope this helps!

answered Aug 10 '17 at 06:28

Aditya Srivastava

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after downloading how to implement it ? @Aditya Srivastava – Aug 10 '17 at 06:29
Hi, Please read this github link, it's given in the first line how to code it. – Aditya Srivastava Aug 10 '17 at 06:33

score 0 · Answer 2 · answered Aug 10 '17 at 07:47

I suggest to use https://github.com/onevcat/Kingfisher Kingfisher is a lightweight, pure-Swift library for downloading and caching images from the web. It provides a build in activity indicator which can be shown in the image view. Kingfisher makes sure images from the exact same url are only downloaded once, it also provides a way to cancel downloading when for example: when the cell that should display the image got scrolled outside the visible area.

how to load images fast during scrolling in swift 3?

2 Answers2