Since you are no longer using the outlet for the text view and will be creating one manually instead, you can remove them safely. At this point, the earlier diagram, and the relationship it shows between the four key classes storage, layout manager, container and text view , should make more sense:. Note that the text container has a width that matches the view width, but has infinite height — or as close as.
This is enough to allow the UITextView to scroll and accommodate long passages of text. Still working in NoteEditorViewController. Open a note. Your custom text view is there and shows the text just like the original. Edit the text while keeping an eye on the Xcode console. You should see a flurry of log messages created as you type, as below:. This is the logging code from within SyntaxHighlightTextStorage to give you an indicator that your custom text handling code is being called.
The code above expands the range that your code inspects when attempting to match your bold formatting pattern. This is required because changedRange typically indicates a single character. It also serves as a convenient home for any post-editing logic. Type some text into a note and surround some of the text with asterisks. The text will be bold as shown in the screenshot below:.
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The basic principle of applying styles to delimited text is rather straightforward: Use a regex to find and replace the delimited string using applyStylesToRange searchRange: to set the desired style of the text. This method applies the supplied font style to the body font. These expressions specify patterns that match the text you want to apply a style to.
You'll also need to initialize the replacements dictionary. Add the following initializers to the SyntaxHighlightTextStorage class:. You're calling the plain initializer with no arguments in the rest of your project. The init coder: initializer is required to keep the compiler happy. Finally, replace the implementation of applyStylesToRange searchRange: with the following:. This method previously performed one regex search for bold text. Now, it iterates over the dictionary of regex matches and attributes since there are many text styles to look for.
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For each regex, it runs the search and applies the specified style to the matched pattern. Note that the initialization of the NSRegularExpression can fail if the pattern has an error in it. You catch the resulting error from the failed compilation of the pattern and log it so that you can fix the pattern. Here's a slightly more challenging exercise. In other words, if the selected text has multiple spaces between the words, there is no match.
Can you create a regular expression that will embolden that text?
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It's just a simple modification of the one already in the code. To correct the issue with dynamic type, your code should update the fonts used by the attributed string containing the text of the note when the content size change notification occurs. The method above applies the body text style to the entire string, re-creates the highlight patterns based on the new font configuration and then re-applies the highlighting styles.
Finally, open NoteEditorViewController. Hopefully, this Text Kit tutorial has helped you understand the features of the library you'll no doubt find useful in practically every app that you write. You've implemented dynamic type support, learned to respond to changes in text sizes within your app, used exclusion paths, and dynamically applied styles to text. You can download the completed version of the project using the Download Materials button at the top or bottom of this tutorial to view the final project. The book has a chapter on using Dynamic Type in your app.
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Getting a newborn to sleep, or even just break out of a crying fit, is no easy feat. Secure Boot. Next, we create another controller called the ChatViewController , which will be the main power house and where everything will be happening. The controller will extend the JSQMessagesViewController so that we automatically get a nice chat interface to work with out of the box, then we have to work on customizing this chat interface to work for us. If you notice on the viewDidLoad method, we are generating a random username and setting that to be the senderId and senderDisplayName on the controller.
This extends the properties set in the parent controller and is required. Before we continue working on the chat controller, we want to create a last class called the AnonMessage class. This will extend the JSQMessage class and we will be using this to extend the default functionality of the class.
In the class above we have extended the JSQMessage class and we have also added some new properties to track: the id and the status. We also added an initialisation method so we can specify the new properties before instantiating the JSQMessage class properly. We also added an enum that contains all the statuses the message could possibly have.
Returning to the ChatViewController , let's add a few properties to the class that we will need:. First, we will add some logic to the viewDidLoad method:. In the above code, we started customizing the way our chat interface will look, using the parent class that has these properties already set. For instance, we are setting the incomingBubble to blue, and the outgoingBubble to green.
We have also eliminated the avatar display because we do not need it right now. The next thing we are going to do is override some of the methods that come with the parent controller so that we can display messages, customize the feel and more:. The next thing we are going to do is create some new methods on the controller that will help us post a new message.
After that, we create a method to hit the remote endpoint which sends the message. Finally, we create a method to append the new message sent or received to the messages array:. Now every time we send a new message, the didPressSend method will be triggered and all the other ones will fall into place nicely!
For the last piece of the puzzle, we want to create the method that listens for Pusher events and fires a callback when an event trigger is received:. In this method, we have created a Pusher instance, we have set the cluster and the key. It will update the message status to delivered so the sender knows the message has indeed been delivered.
Now we should be done with the application and as it stands, it should work but no messages can be sent just yet as we need a backend application for it to work properly. We are going to use Express so that we can quickly whip something up. Here we define the entire logic of our backend application. We are also using SQLite to store the chat messages; this is useful to help identify messages.