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Computed Properties in Swift

Xcode 11.6 Swift 5.2.4

Last updated on August 10, 2020

Continuing the discussion about variables in Swift, let us move on to properties, which are basically Swift constants or variables used in a class, structure, or enumeration.  More specifically, they are stored values for a class, structure, or enumeration, that have getter and setter methods that can be modified.  You can leave them alone, and they will do what they should (return the value or set a new one).  The getters and setters can be overridden, like to override the setter to allow you to check if the input value is valid before storing it.  Getters and setters are also called “accessors” and “mutators” respectively.  Take your pick, but for me, I’m going to just call them getters and setters.

There are a few more aspects to properties, but today, we will be talking about a specific type of property. [Read more…]

Filed Under: Swift Tagged With: properties

Swift Variables and Constants

Xcode 11.6 Swift 5.2.4

Last updated on August 10, 2020

How do you store data in a program?  Well, you store it in variables, but you already knew that didn’t you?  Here is my first post about Swift variables, where we discuss their declaration and definition.  In particular, we will mostly be discussing the concept of Swift variables and constants.

[Read more…]

Filed Under: Swift

MFMailComposeViewController – Send email in your apps

Last updated on August 6, 2014

Have you wanted to send an e-mail from your app and pre-populate the fields like the recipient, subject, or body text?  Apple made it pretty easy with MFMailComposeViewController.  There is a bit of setup, but most of its actual implementation is pretty easy.

[Read more…]

Filed Under: Objective-C

Replace Keyboard with UIDatePicker

Last updated on August 6, 2014

I thought I might write a smaller post today.  This is something I needed to do in one of my apps, and thought I would share a bit of how it is done.  The actual action to take here is pretty easy and short, but I will discuss a few other things I learned while doing it. [Read more…]

Filed Under: Objective-C

Getting started with NSNotificationCenter

Last updated on August 6, 2014

Have you ever wanted to alert other classes of your app of some event from another one?

Sure, you could have your class poll the other one and keep asking if something has changed, but that seems to be wasteful, since in many cases, there usually won’t be.  You could even not bother with polling, and just read it back in all the time, but if there has been no change, that again is wasteful of processing time, power, etc.  To avoid these issues, I have found that  NSNotification Center is a great answer to this problem.  You can just have your class subscribe to the Notification, and then when it alerts your class that there has actually been an event you’ve been waiting for, you THEN can call that class and read in what is necessary, or react appropriately.

[Read more…]

Filed Under: Class Reference, Objective-C

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