The web framework got some love in Xojo 2016r2… General Changes First, the Web Framework now has support for Retina/HiDPI in supported browsers. All controls…
Comments closedCategory: Tips
sort code tips and tricks
Anyone who has built an app in Xojo has used the Listbox method AddRow to create new rows. The iOSTable control in Xojo also has an AddRow method. However, unlike building a desktop app, AddRow is not always appropriate for iOS apps.
Comments closedYour iOS apps uses Views to display information to the user and often your app will have multiple views to show different information. These views can be displayed in different ways.
Comments closedThe new local Language Reference viewer in Xojo 2016r1 supports some useful tricks in its filter field.
This new local Language Reference is enabled by default in new installations. You can also manually enable it in Preferences by choosing “Use built-in documentation” in the General tab.
Comments closedYou can set breakpoints in your Xojo code that cause the debugger to appear when the line of code with the breakpoint is reached. This is incredibly handy to help understand and test your code.
Comments closedIntrospection is a very handy and useful part of the Xojo language.
You can use it to examine a lot of the objects that are in memory at runtime. You can access the properties in those objects, call methods on those objects and even create new instances (with some caveats here).
But there are limits to what you can do with it. You can’t use it to create things that do not exist at runtime because they’ve been stripped out when your app was built.
Comments closedWikipedia defines Code Refactoring as:
the process of restructuring existing computer code â changing the factoring â without changing its external behavior. Refactoring improves nonfunctional attributes of the software.
Did you know that Xojo has a bunch of refactoring features that can help make this process more efficient?
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Introspection is a very handy and useful part of the Xojo language.
You can use Introspection to examine many of the objects that are in memory at runtime. You can access the properties in those objects, call methods on those objects and even create new instances- with some caveats of course.
Comments closedSometimes you’re going to need a data structure that is an array of classes and you’re going to want to sort them. The standard array Sort method can only sort simple types (Text, Integer, etc), so what do you do?
The traditional technique has been to use SortWith. You create a separate array of a simple type, populate it and then sort the temporary array using SortWith to sort the class array.
But there is an even slicker way to sort that was added in 2015 Release 3. You can now create your own custom comparison method and use that to sort the class. This custom method returns 0 if the values to compare are equal, a positive if the first value is greater than the second, and a negative value if the first value is less than the second.
Comments closedMost of us build apps without thinking too much about how much memory the app will need. Sure sometimes you end up creating an app that is a real memory buster but that’s unusual. With virtual memory, gone are the days when your app would just run out of memory and crash, or are they?
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