Adventures in Swift and iOS App Development
In the last tip, I showed you how to use UIPickerControllers to make a time interval input. What I didn't show you is how to output that. In this tip I'll show you how to read and convert data from a picker that has a separate delegate. If you download the exercise file, you'll have …
Continue reading "Time Picker Part 2: Strings to Time Intervals"
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 …
A few months ago, Apple removed my app Interval RunCalc from the App Store for being too old. In this series of articles I'll document what I did on rebuilding and improving the app. In the last installment, I placed my new model into the old app, fixed a lot of errors from taking 2013 …
Continue reading "This Old App: Why I Hate PickerViews, but Learned To Love Them."
The keyboard can be a curse. Trying to validate data via keyboard can be a nightmare for many projects. One solution to this problem is using a UIPickerView to limit the values the user can enter. In this lesson, we'll explore the UIPickerView for numerical input. UIPickerViews are are series of wheel like scrolling objects. …
Swift is a new language. Objective C is not. Sometimes you have some Objective C code and want to make it into Swift code. I had a case of that this week when a reader asked me about continuous picker view wheels. If you are familiar with the date picker it goes from 0 to …
Continue reading "Converting Objective C to Swift : The Circular Picker View Example"
[Updated to Swift 2.0/iOS9.0 9/15/15] I've posted on UIPickerViews before, but in the comments for that post, I got a question that needed an answer so big, it was worth a new post. UIPickerViews are those spinning wheel slot machine type controls. For a variety of reasons I went into in the earlier post they …
[Updated to Swift3.0 10/4/16 SJL] This week, we'll look at UIPickerView. Picker views are the spin-wheel like controls that often remind me of slot machines. Picker views, like table and collection views, are delegate based. You need to adopt a delegate and data source to get them to work properly. Picker views also take a lot …
