![]() Below is the UI that we’re going to build.įirst, drag out two UITextFields and align them so they are of equal width. For the input and output, we’ll use UITextFields. To select from a finite list of options, as in our units, we need to use a UIPickerView. We need an input field for the user to enter data into, an output, and two views to select from a finite list of items. You can uncheck all of the checkboxes below since we won’t be doing anything involving core data or testing.įirst, let’s create our UI. Make sure the language is set to Swift, and the device is iPhone. We’ll call it UnitConverter, and you can change the organization name and identifier to anything you want. Open up Xcode and let’s create a new Single View App. Let’s get started on our Unit Converter app! That acts as our controller. The model is something that we have to build independent of our controller and view. As stated above, it’s so we can make changes to our model and only need to alter our controller. The storyboards act as our views. Each storyboard is bound to a UIViewController subclass. This is why we have UIViewController and storyboards. Specifically, iOS requires us to implement the MVC pattern very tightly. The controller is the most crucial component that allows for communication between the model and the view. However, the view and the model don’t even know the other exists! This is so we can make changes to the model or the view and we only need to update the controller instead of all three components! (The view in most case is the component that is updated the most frequently.) The MVC Pattern is now ubiquitously used in both mobile and desktop development. The view is pretty self-explanatory: it’s the UI that’s presented to the user. The model can be any kind of backend such as a database or web server. It can also be any kind of structure that holds or stores data somewhere, like a local key-value pairing system. The above figure is an illustration of the components of the MVC pattern. For this, we use the Model-View-Controller (MVC) pattern. The MVC Pattern is now ubiquitously used in both mobile and desktop development. Similar to the concept of encapsulation in object-oriented programming languages, we want to make sure our components are separated from each other. Imagine the mess our app would be if we had storyboards, Swift source code, and other components wildly about in our iOS project! To prevent this disaster from occurring, we have design patterns we follow to try to keep our code as segmented as possible. When dealing with a system that has many moving parts it’s helpful to have some form of system design that helps us keep everything distinct. ACCESS NOW Model-View-Controller Pattern (MVC) ![]()
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