You can call into Linux APIs to use methods and properties that are not built into the framework by using the Declare command. To create a Declare statement you first need to track down the API you want to use using Linux documentation.
You can call into Cocoa Touch APIs to use methods and properties that are not built into the framework by using the Declare command. To create a Declare statement you first need to track down the API you want to use in Apple’s documentation: Apple Developer Documentation. Most of the time you will reference the Foundation and UIKit libraries, but there are many other libraries as well. Xojo Declares use the Objective-C names so be sure to refer to those in the documentation rather than the Swift naming.
Many years ago, the Window Functionality Suite (WFS) library was created by Aaron Ballman. This library was a collection of Win32 Declares (and a few other things) for accessing Windows-specific functionality that was not directly provided by the Xojo framework.
WFS is still available on GitHub, but it has languished over the years. For example, it has lots of legacy code in it for older versions of Windows that is no longer needed since Xojo only supports Windows 7 and later. WFS is also not really compatible with 64-bit projects since the Declares mostly assume 32-bit or bust.
To that end, I’ve started a new open-source project called WinAPILib that is now available on GitHub.
The other day Geoff was working an iOS project and asked me if there was a way to hide the border on an iOS Text Field. It turns out that this is pretty easy. Here’s how.
In this Xojo tutorial we will see how simple it is to make an iOS App that shortens an entered URL using the public API of Bit.ly. We will use our own subclass inherited from Xojo.Net.HTTPSocket, and the Declare statement in order to use some functions and methods found on the native Cocoa Touch API. In fact, the use of Declare is mandatory because with the new Xojo Framewok we don’t yet have access to the EncodeURLComponent function available with the old framework. This one is a big help in substituting any ilegal character with his hexadecimal value for the final URL’s composition.
I’m sure you’ve all seen the iOS Mail app, which displays the number of unread messages in a small red badge in the top right of the app icon. You can do this too with your Xojo app and the magic of the Declare command.
When doing a lot of manipulation to a TextArea’s contents under Cocoa, performance can suffer due to the underlying NSTextView doing work on layout and glyph selection. This can be sped up by telling the text view that you’re going to begin editing. You can do this by using a few Cocoa Declares.