Tasky has straightforward functional requirements:. You should consider your use of platform-specific features. Start with a high-level design that can be implemented across the target platforms. Take care to note platform-specfic UI constraints. For example, a TabBarController in iOS can display more than five buttons, whereas the Windows Phone equivalent can display up to four. Draw the screen-flow using the tool of your choice paper works.
Knowing what data needs to be stored will help determine which persistence mechanism to use. See Cross-Platform Data Access for information about the available storage mechanisms and help deciding between them. For this project, we'll be using SQLite.
Consider the API that the user interface will need to consume to meet the requirements. A to-do list requires the following functions:. Once the application design has been agreed upon, consider how it might be implemented as a cross-platform application.
Following the guidance in the Building Cross-Platform Applications document, the application code should be broken down into the following parts:. Tasky Portable uses the Portable Class Library strategy for sharing common code.
See the Sharing Code Options document for a description of code-sharing options. All common code, including the data access layer, database code and contracts, is placed in the library project. The complete PCL project is illustrated below. All of the code in the portable library is compatible with each targeted platform.
When deployed, each native app will reference that library. The class diagram below shows the classes grouped by layer. The rest of the classes are custom code for Tasky. Using namespaces to separate the layers helps to manage references between each layer. The platform-specific projects should only need to include a using statement for the Business Layer.
Portable class libraries need to be usable across multiple platforms, each with varying levels of support for platform and framework features. Because of that, there are limitations on which packages and framework libraries can be used. For example, Xamarin.
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