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in my iOS app, i have a simple if statement like this:
if (responseString! != "No Data") {
print("Data available")
}
if I print the responseString, this is the result:
No Data
But the print "Data available" will shown as well.
why?
There might be whitespaces or newlines in your responseString, try this:
let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)?.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
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Closed 6 years ago.
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I can fetch data from firebase console. But how to get node from the database.
Please refer to below code :
let current_uid = FIRAuth.auth()?.currentUser?.uid
self.userRef?.queryOrdered(byChild: "Email").observe(FIRDataEventType.childAdded) { (snapshot : FIRDataSnapshot) in
let value = snapshot.value as? NSDictionary
let email = value?["Email"] as? String
let password = value?["Password"] as? String
print("User Email \(email!) and User Password \(password!)")
}
But i am bit confuse how to get 4dS6fdWy4of8VyDN8eouwqIk38j2 remember i have to fetch all the users from the database.
Any help will be appreciated.
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i am trying to save a string to device's memory for a simple to do app. It works great on a simulator where i set the path for writing to memory to be - let path: String = directory + "App4.txt". But when running this on an actual iPhone it doesn't save to memory.
This is the function.
if let directory: String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true).first {
let path: String = directory + "App4.txt"
userInputString = userInput.joinWithSeparator("-")
// Writing.
do {
try userInputString.writeToFile(path, atomically: false, encoding: NSUTF8StringEncoding)
}
catch {
print("Error")// Error handling here.
}
}
Any help is very much appreciated!! :)
As #Martin-R is alluding to, you need to have a "/" in your path between directory and the file name.
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I have a project that polls a URL that returns a JSON format values. Any recommendations of whats the best way to parse the result for my iOS app?
First of all there is no such thing as best way. If there was a best way, you will probably heard it or find it among top google hits.
You can make do-it-yourself with NSJSONSerialization. This what Apple provides, and it is merely the fastest and the hardest to use. It's not even that 'hard', it just get's complicated when JSON has manny sub-levels.
What I can recommend you is SwiftyJSON. It had minor(barely noticable in most apps) overhead but it's much more easier to use in Swift. A great example is found on raywenderlich site.
You can also simply parse
var data = NSData(contentsOfURL: NSURL(string: "http://api.androidhive.info/contacts/")!)
var parcedData : NSMutableDictionary = NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments, error: nil) as! NSMutableDictionary
print(parceData)
There are many other ways to do it.
You can use Alamofire with SwiftyJSON
Snippet With Alamofire and SwiftyJSON
Alamofire.request(.GET, url, parameters: parameters)
.responseJSON { (req, res, json, error) in
if(error != nil) {
NSLog("Error: \(error)")
println(req)
println(res)
}
else {
NSLog("Success: \(url)")
var json = JSON(json!)
}
}
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I have been playing around with Swift as I'm new to iOS Development and really enjoying getting to know the language. Recently I have started to look at installing third party plugins etc and I found one called SwiftyJson (https://github.com/SwiftyJSON/SwiftyJSON) I have managed to get it to work using this script:
request(.GET, url, parameters: parameters)
.responseJSON { (req, res, json, error) in
if(error != nil) {
NSLog("Error: \(error)")
println(req)
println(res)
}
else {
NSLog("Success: \(url)")
var json = JSON(json!)
println(json)
}
}
I would like to know two things: 1) Is it possible to get the list of results from the JSON provided into a UITableView like so:
Item 1
----------------------------
Item 2
----------------------------
Etc.. and 2) How would I do that?
Edit: Json
Sorry about image - I couldn't copy it because of a stupid chrome extension I have:
Yes it is possible, though you aren't really using the important features of SwiftyJSON in this code sample. The most straightforward way would be to create the tableview the same as you would for anything, likely using an array as your datasource. Once you've received your JSON you still need to parse it and create the objects for your array. Perhaps if you included a snippet of the JSON, it would be easier to help.
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I need to get the current URL loaded into the webview and this is how I'm trying to get that but it gives me this error: "Cannot convert the exporessions type 'ST7??' to type 'String'
and this is the code
var currentURL : NSString = webView.request?.URL.absoluteString!
What is wrong with this?
If you put parentheses around this, the error goes away:
let currentURL : NSString = (webView.request?.URL.absoluteString)!
Beware that yours might not be just a syntax problem.
If your webView is in a state where request == nil your app will crash at runtime.
I'd rather write something like:
if let currentURL = webView.request?.URL.absoluteString {
// do things ...
// Your currentURL will be automatically bridged to Swift's String type
} else {
// Just in case request is nil ...
}