I'm trying to retrieve the URL from a UserDefault I saved previously, but parsing it to URL fails as states: "Cannot convert NSINLINEDATA to NSURL"
I've tried parsing it to String and then to URL but it only gives nil
Set value
let videourl = info["UIImagePickerControllerReferenceURL"] as? URL
if let videoURL = videourl{
defaults.set(videourl,forKey: "LullabyURL")
}
Get value
let videoURL = defaults.value(forKey: "LullabyURL")
let newStr = String(data: videoURL as! Data, encoding: .utf8)
let vu = URL.init(string:newStr ?? "nil")
let player = AVPlayer(url: vu!)
You can use built in method func url(forKey defaultName: String) -> URL? to retrieve URL as below,
if let defaultsUrl = UserDefaults.standard.url(forKey: "urlString") {
let player = AVPlayer(url: defaultsUrl)
}
Related
I have Medicine struct that holds image_origin URL of image I want to download and set to the ImageView.
For downloading/caching purposes I'm using Kingfisher framework.
let m = medicines[indexPath.row]
cell.medicineImage.kf.setImage(with: URL(string: m.value(forKeyPath: "image_origin") as! String)!)
cell.medicineName.text = m.value(forKeyPath: "i_name") as? String
In the code above m is an NSManagedObject of CoreData. I try to get image URI from the CoreData and set it to the ImageView, but every time at the line 2 I get the following error message: Unexpectedly found nil while unwrapping an Optional value
I have tried changing variables and Optinal types, tried to hardcode URI but without success.
What am I doing wrong?
P.S. Im using Swift4
Just unwrap safely to fix the crash and check your database if you are not getting the urlString properly,
if let urlString = m.value(forKeyPath: "image_origin") as? String {
print(urlString)
guard let url = URL(string: urlString) else { return }
cell.medicineImage.kf.setImage(with: url)
}
There might be a problem with image_origin key that I may have value as string or may not have. So, just need to confirm the value and use it
let m = medicines[indexPath.row]
cell.medicineName.text = m.value(forKeyPath: "i_name") as? String
guard let urlPath = m.value(forKeyPath: "image_origin") as? String, let url = URL(string: urlPath) else { return }
cell.medicineImage.kf.setImage(with: url)
ok guys can I get a little help with my code. When running the app I get an error is there any way to fix this problem?
let fileUrl = dict["fileUrl"]as! String
let url = NSURL(string: fileUrl)
let data = NSData(contentsOf: url! as URL!)
let picture = UIImage(data: data! as Data!)
let photo = JSQPhotoMediaItem(image: picture)
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, media: photo))
Image here
Here I see 4 big fat problems with your code.
You are force casting the value of fileUrl of the dictionary dict to String. If your dictionary doesn't have the value for fileUrl, or if it's not castable to string, your code will crash. You should change that to optional cast like:
if let fileUrl = dict["fileUrl"] as? String
{
//your code if you have fileUrl
}
When creating the url to the file, you are using the wrong initialization method, you should be using this:
let url = URL(fileURLWithPath: fileUrl)
After you have the url to the file, you should also check if you have the data of the file, because contentsOfFile: initializer of the NSData returns the optional object, which may be nil, so another if check:
if let data = NSData(contentsOf: url) {\\ code with the data}
init?(data: Data) initializer of the UIImage also returns optional object, so if the required by latter code, you should also check if you have the image or nil with if statement.
The result code should be something like:
if let fileUrl = dict["fileUrl"] as? String {
let url = URL(fileURLWithPath: fileUrl)
if let data = NSData(contentsOf: url) {
let image = UIImage(data: data as Data) // you can cast NSData to Data without force or optional casting
let photo = JSQPhotoMediaItem(image: image)
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, media: photo))
}
}
Hope this helps.
Replace the first line of code with this line for optional binding check :-
guard let fileUrl = dict["fileUrl"] as! String else {return}
Yo should do validation in cases where the variable may be nil, the following is an example:
if let fileUrl = dict["fileUrl"] as? String {
let url = URL(string: fileUrl)
do {
let data = try Data(contentsOf: url!)
let picture = UIImage(data: data)
let photo = JSQPhotoMediaItem(image: picture)
self.messages.append(JSQMessage(senderId: senderId, displayName: senderName, media: photo))
} catch {
}
}
I use oAuth for the users login.
func getUserInfoResponse(_ response: APIResponse!) {
print("----------------------------------------")
print("用户资料获取成功：")
print(response.jsonResponse)
//print(response.jsonResponse["figureurl_qq_2"])
let accessToken = _tencentOAuth.accessToken
let nickname = response.jsonResponse["nickname"] as! String!
let avatar = response.jsonResponse["figureurl_qq_1"] as! String!
let avatar2 = response.jsonResponse["figureurl_qq_2"] as! String!
let urlString:String = "http://www.xxxxxx.com/cloud/app?openid=\(accessToken!)&nickname=\(nickname!)&avatar=\(avatar!)&avatar2=\(avatar2!)"
self.wk = WKWebView(frame: self.view.frame)
let url = URL(string: urlString)!
self.wk.load(URLRequest(url: url))
self.view.addSubview(self.wk)
}
and print(urlString) is
http://www.example.com/cloud/app?openid=xxxxxxx32D1E05D95E91881A15A8CDC75&nickname=
.&avatar=http://q.qlogo.cn/qqapp/101237639/90012AB5E745A1B10A6F5F4A14F0B48D/40&avatar2=http://q.qlogo.cn/qqapp/101237639/90012AB5E745A1B10A6F5F4A14F0B48D/100
when user login, , all the values have value except the url and get this error:
fatal error: unexpectedly found nil while unwrapping an Optional value
Why the url is nil, it has been assigned with value. Sorry I'm new to ios and swift3.
You should encode the url before use it
if let urlEncoded = urlString.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed){
let url = URL(string: urlEncoded)
}
I am trying to upload a video to a server file through Alamofire but I couldn't get the "data" going to be passed..its always nil
var videoURL = NSURL(string: "")
//returns Optional(file:///private/var/mobile/Containers/Data/Application/1FB40086-228B-4011-A9D4-7874E2EEF9F4/tmp/4A6AAD76-B899-4B67-8E96-925DA4AE9E93.mov)
let videodata = NSData(contentsOfFile: (videoURL?.absoluteString)!)
//nil
let url = NSURL(fileURLWithPath: (videoURL?.absoluteString)!)
let videodata = NSData(contentsOf: url as URL)
//nil
If I get data would lead a way for me to do this:
Alamofire.upload(multipartFormData: { multipartFormData in
multipartFormData.append (videodata as! Data, withName: "file", fileName: "file.mov", mimeType: "video/quicktime")
enter code here
EDIT::
thank you guys, with your help I have struggled my way out of there to this file not found error, but I can see the file is being saved in my gallery, any clue would save my day.
print (videoURL!)
//returns file:///private/var/mobile/Containers/Data/Application/3F280477-DA16-4A67-AE60-D6247143352E/tmp/1E4AC002-6AD0-41E1-9E0D-A09B697F81F7.mov
print (videoURL!.path!)
// returns /private/var/mobile/Containers/Data/Application/3F280477-DA16-4A67-AE60-D6247143352E/tmp/1E4AC002-6AD0-41E1-9E0D-A09B697F81F7.mov
var videoData = NSData()
let path = videoURL!.path!
if FileManager.default.fileExists(atPath: path) {
}else {
print("Could not fin file at url: \(videoURL!.path!)")
// here it throws file not found
}
In Swift 3 use native URL and Data instead of NSURL and NSData.
if let videoURL = URL(string: urlString), let videodata = try? Data(contentsOf: videoURL) {
//Add code of Alamofire here
}
Using absoluteString returns a string that includes file:// at the beginning and you don't want that. You need to return the path of the URL
guard let videoPathString = videoURL.path as? String else {
//handle error here if you can't create a path string
return
}
var videoData = NSData()
//check if file exists at this path first
if (NSFileManager.defaultManager().fileExistsAtPath(videoPathString)) {
videoData = NSData(contentsOfFile: NSString(videoPathString))
} else {
//if file does not exist at that path, handle here
}
I try to parse json with SwiftyJSON. One of the fields have url to image and i try to save it as NSData but I face crash and console errors. Crash appears when compiler comes to object creation
code it the following
var JSONStorage : [Article?]?
var objects = [Article?]()
override func viewDidLoad() {
super.viewDidLoad()
let number = arc4random_uniform(1000)
let urlString = "http://wirehead.ru/article.json?\(number)"
if let url = NSURL(string: urlString) {
if let data = try? NSData(contentsOfURL: url, options: []) {
let json = JSON(data: data)
for element in json["article"].arrayValue {
let id = Int(element["id"].stringValue)
let title = element["title"].stringValue
let subtitle = element["subtitle"].stringValue
let body = element["body"].stringValue
let img = element["images"]["main"].rawValue
let obj:Article = Article(id: id!, title: title, subtitle: subtitle, body: body, mainImage: img as! NSData)
objects.append(obj)
print("We are inside if let")
}
}
}
print(objects)
}
Link to JSON is http://wirehead.ru/article.json and here is with highlight http://pastebin.com/AAEFjsQN
Error that I get is
Any advice ?
["images"]["main"] contains an URL represented by a String
To get the image data, use something like this
let imgURLString = element["images"]["main"].stringValue
if let url = NSURL(string:imgURLString) {
let img = NSData(contentsOfURL:url)
}