- #App store swift publisher how to
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#App store swift publisher code
Once confirmed, the system should redirect you to the TextReader app and displays the Great! It works! message.Īlternatively, you can use the QR Code Reader app for testing.
You can open mobile Safari and enter textreader://Great!%20It%20works! in the address bar – you’ll be prompted to open the TextReader app. That’s normal because the TextReader app is triggered by another app using the custom URL. If you compile and run the app, you should see a blank screen. We instantiate a UIAlertController and present the message on screen. The rest of the code is very straightforward. For example, “Hello World!” is encoded to Hello%20World! The removingPercentEncoding method is used to decode the message by removing the URL percent encoding. URL encoding replaces unsafe ASCII characters with a % followed by two hexadecimal digits and a space with %20. For characters outside the ASCII character set, they should be encoded using URL encoding. URLs can only contain ASCII characters, spaces are not allowed. The first line of code extracts the message by using the host property of the URL structure. For instance, if another app launches textreader://Hello!, then the URL will be embedded in the URL object. The custom URL will look like this:įrom the arguments of the application(_:open:options:) method, you can get the URL resource to open. This app serves as a receiver app that defines a custom URL and accepts a text message from other apps. We’re going to create another app called TextReader. Let’s see how we can add a custom URL to our QR Reader app. Interestingly, Apple allows developers to create their own URLs for communicating between apps. The other URL is for sending a text message using Whatsapp. The first URL is used to open the news feed of the user’s Facebook app. In the sample QR codes, I included two QR codes from third party apps:
#App store swift publisher how to
We will discuss more about custom URL scheme in the next section and show you how to workaround this issue. This explains why the app cannot open Facebook and Whatsapp even it can decode their URLs. 771183+ 0800 QRCodeReader - canOpenURL : failed for URL : "fb://feed" - error : "This app is not allowed to query for scheme fb" All you need to do is to put the following code at the beginning of the launchApp method:Ģ017- 12- 12 12 : 58 : 26. With this property, it is quite easy for us to fix the warning issue.
When the UIAlertController object is dismissed, the presentedViewController property will be set to nil. For example, when the QRScannerController object calls the present(_:animated:completion:) method to present the UIAlertController object, the presentedViewController property is set to the UIAlertController object. In iOS, when you present a view controller modally using the present(_:animated:completion:) method, the presented view controller is stored in the presentedViewController property of the current view controller. To resolve the issue, we have to check if the app has presented a UIAlertController object before calling the present(_:animated:completion:) method. So the app may present another UIAlertController when there is already a UIAlertController presented. The launchApp method is called every time when a barcode or QR code is scanned. Note that the app only works on a real iOS device. If you compile and run the app, you’ll have a simple QR code reader app.
#App store swift publisher download
To start with, first download the QRCodeReader app.
When the QR code is decoded, the app will launch the corresponding app based on the type of the URL. In this chapter, we’ll make it even better. So far, the demo app is capable of decoding a QR code and displaying the decoded message on screen. If you haven’t read the QR code tutorial, go back and read it before continuing on. We will reuse the QR code reader app that was built in the previous chapter. You’ll see what I mean in a minute.Īs usual, we will build an app to demonstrate the use of URL schemes. Additionally, you can create a custom URL scheme for your own app so that other applications can launch your app via a URL. Similarly, you can use another URL scheme to launch the Message app for sending an SMS. You can use a specific URL scheme to launch the built-in phone app and dial the number automatically. For example, let’s say your app displays a phone number, and you want to make a call whenever a user taps that number. The URL scheme is an interesting feature provided by the iOS SDK that allows developers to launch system apps and third-party apps through URLs.
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