Tag: delegates

• October 10, 2019

  Segue Actions

  

  If you’ve been working with View controllers for a while, you’ve probably dealt with prepareForSegue. In Xcode 11, there’s a new way to handle this that makes a little more sense: Segue actions. Let’s take a look at this feature.   If you download the storyboard, you’ll find I set one up for you. It is…
• January 30, 2019

  Protocols and Time Pickers

  

  While there is the date components picker, sometimes you want a picker the gives a time interval in seconds. In this two-part tutorial, Let me show you how to set up one, and discuss some good uses of protocols beyondself If you download the exercise files, you’ll see I set up a project with two…
• September 23, 2016

  Why do we need Delegates in iOS and WatchOS?

  

  About two years ago someone asked me a very good question: Why do we need delegates for UIViewControllers?  He thought Swift  made things easier, but this delegate stuff seems very complicated. Shouldn’t we be able to send a message or initializer between classes? When I first learned iOS, I’ll admit it took me months to…
• June 27, 2016

  Using Segues and Delegates for Navigation Controllers in Swift 4.0

  

  [Updated 2/13/2018 to Xcode 9 / Swift 4.0] It should be one of the easiest things we do, and yet for many it is the most confusing. Getting data from one view controller to another as you switch views never seems easy. Segues might be slightly difficult, but delegates to get the information back have…
• August 7, 2015

  A Swift Tutorial for Working with Classes Part 3: Abstract classes.

  In the first tutorial in this series we introduced classes. In  the second we did some more advanced manipulations of classes. In both, we discussed the idea of inheritance, which has one final possibility: a class whose only purpose is to define other classes. This is known as  an abstract class. Abstract classes are mere…
• September 9, 2014

  Swift Swift: Using Tab Bar Controllers in Swift

  [Updated to Swift 2.0/iOS9.0 9/20/2015 SJL] While Navigation controllers often have the limelight when it comes to Xcode’s view  controllers, tab bar controllers are better for independent tasks in the same app, or for different ways of working with the same model. In this lesson we’ll take a look at tab bar controllers and after…
• September 4, 2014

  Swift Swift: Using Xibs and Delegates with Modal Views

  

  In the last post, I showed how to create modal views and popovers on an iPad . That lesson was missing two critical things for modal views, which we will cover in this one. We will learn how to add a .xib file to a view controller. Then we will add a delegate to return…
• August 4, 2014

  The Swift Swift Tutorial: Why Do We Need Delegates?

  [Updated to Swift 2.0/iOS9 SJL 9/28/15] A Note to readers: This post is out of date. Since Swift 3.0, iOS 10 and watchOS 3 have so many changes, I made a new post wth proper syntax, and a lot better illustrations. You can find that here on my site   or here on LinkedIn Pulse  …
• July 12, 2014

  The Swift Swift Tutorial: How to Use UITableView in Swift

  [Converted to to Swift 2.0/iOS9 9/28/15 SJL] The workhorse control in iOS is the table view. With both a delegate and data source it is powerful, flexible and can get a bit complicated. In this lesson, we will add a table view controller between the Pizza Demo and the Edit Price scenes in our earlier…
• July 5, 2014

  The Swift Swift Tutorial: Using Delegates and Segues in Swift Part 2 — The Pizza Demo App

  In our last post, we went through a very basic framework for segues and delegates in Swift. This time, we will add the segues and delegates to the pizza demo application so we can change the prices in the dictionary for the pizzas. Swift and Xcode is still in beta, and there are quirks I’ll…