ios - Why is the result of the code same? The code is using only the value of the last function for all the looping -


all value in variable (filename, destinationfolder) different loop except "let uploaddidfinish: (()-> void)". learnt, supposed different declared in different instance.

i put following code in view controller viewdidload()

let uploaddidfinish: ()-> void = {     print("\nunzip \(self.foldername+".zip")\n")     self.c.unzipfile(foldername: self.mfoldername+"/"+self.foldername,filename: self.foldername+".zip") } downloadmanager.shared.downloadfile("https://ping.passivealtitude.com/magazinefile/"+foldername+"/"+foldername+".zip", to: mfoldername+"/"+foldername, filename: foldername+".zip", upload: uploaddidfinish)

after loop 4 times, result of code above

downloaded file:///users/vivian/library/developer/coresimulator/devices/3ff96128-fc8f-4d44-9b4d-dc1989eff9ff/data/containers/data/application/15b32c21-6117-4cd9-a70e-7c0bfc0dfa6a/documents/magazine/book1/book1.zip

downloaded file:///users/vivian/library/developer/coresimulator/devices/3ff96128-fc8f-4d44-9b4d-dc1989eff9ff/data/containers/data/application/15b32c21-6117-4cd9-a70e-7c0bfc0dfa6a/documents/magazine/book2/book2.zip

downloaded file:///users/vivian/library/developer/coresimulator/devices/3ff96128-fc8f-4d44-9b4d-dc1989eff9ff/data/containers/data/application/15b32c21-6117-4cd9-a70e-7c0bfc0dfa6a/documents/magazine/book3/book3.zip

downloaded file:///users/vivian/library/developer/coresimulator/devices/3ff96128-fc8f-4d44-9b4d-dc1989eff9ff/data/containers/data/application/15b32c21-6117-4cd9-a70e-7c0bfc0dfa6a/documents/magazine/book4/book4.zip

unzip book4.zip

unzip book4.zip

unzip book4.zip

unzip book4.zip

when supposed

unzip book1.zip

unzip book2.zip

unzip book3.zip

unzip book4.zip

first function passed 

class downloadmanager: nsobject { ...  @discardableresult func downloadfile(_ url: string, foldername: string, filename:string, upload: @escaping (()->void)) -> downloadoperation {     let link = url(string: url)     let destinationfolder = createdirectory(foldername: foldername)     let operation = downloadoperation(session: session, url: link!, destinationfolder: destinationfolder, filename:filename, upload: upload)     operations[operation.task.taskidentifier] = operation     queue.addoperation(operation)     return operation }

then, have passed download file function 

class downloadoperation : asynchronousoperation {     var task: urlsessiontask!     let destinationfolder: url     let filename: string     let uploaddidfinish: (()-> void)     let manager = filemanager.default      init(session: urlsession, url: url, destinationfolder: url,filename: string, upload: @escaping (()->void)) {         self.filename = filename         self.destinationfolder = destinationfolder         self.uploaddidfinish = upload         super.init()         task = session.downloadtask(with: url)     }      override func cancel() {         task.cancel()         super.cancel()     }      override func main() {         task.resume()     } }  extension downloadoperation: urlsessiondownloaddelegate {      func urlsession(_ session: urlsession, downloadtask: urlsessiondownloadtask, didfinishdownloadingto location: url) {         {             let destinationurl = destinationfolder.appendingpathcomponent(filename)             if manager.fileexists(atpath: destinationurl.path) {                 try manager.removeitem(at: destinationurl)             }             try manager.moveitem(at: location, to: destinationurl)             print(" \ndownloaded \(destinationurl)\n")         } catch {             print("downloadoperation: urlsessiondownloaddelegate: \(error)")         }          self.uploaddidfinish()      }

the code below connects view controller download manager. 

dispatchqueue.main.async {             self.uploaddidfinish()         }

the original code how download multiple files sequentially using nsurlsession downloadtask in swift

why result same? appreciated!

when uploaddidfinish been execute self.foldername changed book4, print("\nunzip \(self.foldername+".zip")\n") output: unzip book4.zip. e.g.

class downloadoperation : asynchronousoperation {     ...         let uploaddidfinish: ((string, string)-> void)     init(session: urlsession, url: url, destinationfolder: url,filename: string, upload: @escaping ((string, string)->void)) {         ...                self.uploaddidfinish = upload     } }   extension downloadoperation: urlsessiondownloaddelegate {     func urlsession(_ session: urlsession, downloadtask: urlsessiondownloadtask, didfinishdownloadingto location: url) {         ...         self.uploaddidfinish(filename, destinationfolder.path)     } }

Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more