CODEWITHSUNDEEP
iosswiftquicklookqlpreviewcontroller
Zhihua Shen
Zhihua Shen

Reputation: 43

QLPreviewController does not work on iOS11

class ViewController: UIViewController {
    let quickLookController = QLPreviewController()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        quickLookController.dataSource = self
        quickLookController.delegate = self
    }
    
    @IBAction func buttonAction(_ sender: Any) {
        present(quickLookController, animated: true, completion: nil)
        
        quickLookController.reloadData()
        quickLookController.refreshCurrentPreviewItem()
    }
}

extension ViewController: QLPreviewControllerDataSource,QLPreviewControllerDelegate {
    
    func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
        return 1
    }
    
    func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
        let path = Bundle.main.path(forResource: "AppCoda-Ppt.ppt", ofType: nil)
        
        let url = NSURL(fileURLWithPath: path!)
        
        return url
    }
}

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Upvotes: 4

Views: 2442

Answers (3)

biomiker
biomiker

Reputation: 3306

Answer from @Thomas is correct (THANK YOU!) For Swift 3 you can do something like this in the previewItemAt:index method to cache the file on demand:

func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {

    guard let CacheDirURL = try? FileManager.default.url(for: .cachesDirectory, in: .userDomainMask, appropriateFor: nil, create: true) else {
        print("Can't get cache dir URL")
        return NSURL(fileURLWithPath: "FILE_NOT_FOUND")
    }

    let fileUrl = CacheDirURL.appendingPathComponent("cachedFileName.pdf")

    if !FileManager.default.fileExists(atPath: fileUrl.path) {
        if let sourceUrl = Bundle.main.url(forResource: "Pioneer_UAS_Policy_Aug_2016", withExtension: "pdf") {
            print("Copying file from bundle \(sourceUrl.path)")
            try? FileManager.default.copyItem(at: sourceUrl, to: fileUrl)
        }
    }

    return NSURL(fileURLWithPath: fileUrl.path)

}

Upvotes: 1

saltwat5r
saltwat5r

Reputation: 1147

You have to copy the file to the i.e. temporary directory and read the file from there.

Upvotes: 0

Thomas Deniau
Thomas Deniau

Reputation: 2573

This is a bug in iOS 11.2. Please file it at bugreport.apple.com if you want to be kept up to date on its status. A workaround is not to store your ppt file in your app bundle. Use a different location somewhere in your container, such as your Application Support directory.

Upvotes: 4

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