Adventures in Swift and iOS App Development
A few months ago, Apple removed my app Interval RunCalc from the App Store for being too old and not updated. In this series of articles I'll document what I did on rebuilding and improving the app. In the last episode, I got the table to use multiple cells and the app to total those cells …
Continue reading "This Old App: Communicating with Container Views"
A few months ago, Apple removed my app Interval RunCalc from the App Store for being too old and not updated. In this series of articles I'll document what I did on rebuilding and improving the app. In the last installment, I got the custom table view talking with the root view. This time I’m adding multiple cells to …
In iOS you are limited to two labels and an image for one of the standard table view cell styles. You might want more custom cells than this. You are not alone with other developers including, Instagram, Twitter, Feedly and even Apple often using more than the basic table view cell. You can customize table view cells and populate …
Table views on any mobile platform are the workhorse of any application. To be a good developer you need to make table views easily. Tables in iOS use the UITableView class to do so. This is a very powerful class with many features to make the tables you see in applications like Facebook, Instagram and …
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 …
Continue reading "Why do we need Delegates in iOS and WatchOS?"
Have you ever seen some factory method in UIKit and see this strange parameter called completion or completionHandler? Usually you put nil there and leave it alone. These strange things like (Double,Double) -> Bool things are closures. Closures are functions you use as types, often in parameters of other functions. In this lesson we'll explore …
How does the Apple Watch communicate to the user when they are not looking at the watch face? That is done with haptics. Haptics are sounds and taps letting the user know something is happening. In this lesson, I'll explain to you how to use haptics in Watch OS applications by creating a catalog of all the haptics …
Continue reading "Make a WatchOS 3 Haptic Catalog with a Picker"
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 how to make them in Swift programmatically. If you are interested …
Continue reading "How to Make a Tab Bar Controller in Swift 3.0 Code"
Navigation controllers are the workhorse of organizing view controllers. I've covered much of their use in other posts about MVC, segues and delegates. In this chapter, we’ll go through some of the Swift code for the Navigation controller. The View Controller Stack Navigation view controllers are stack based. The newest view controller is the visible …
Continue reading "Programmatic Navigation View Controllers in Swift 3.0"
In my post Why do we need delegates, I explained one major developer use of delegates: moving data from a destination view controller back to the controller that presented it or pushed it onto the stack. This is not the only use of delegates. Apple uses it often in APIs. In this theoretical lesson we'll discuss …
