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Category: Tips

Working with XML

XML can sometimes be a bit confusing, so here are some tips to help you work with XML files.

First, you need to make sure your XML is really XML.

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Me vs. Self

When you add a control such as a PushButton to a Window (or a WebButton to a WebPage or an iOSButton to an iOSView), an instance of the control is created for you and added to the layout. Code that is in the event handlers of a control added in this way can refer to both its own properties and methods as well as the properties and methods of the window.

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Tip: SQLite in RAM … to improve speed!

It’s very usual to use encrypted SQLite databases in our Xojo projects where we expect to get the maximum read speed from them. But the truth is that encrypting the data in these databases can introduce a penalty in our queries, both from read and writing/updating data to them. How can we improve this? One technique is the creation of a new in-memory based SQLite database, where we will be able to copy the table (or tables) we are interested in getting the maximum speed possible with. Continue reading to see how to do this.

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#If vs. If and Conditional Compilation

There was a curious question on the forums about what # meant.

And from the way it was asked I could see the asker was thinking “I know what If means but what about that # in front of it?” And that if they knew what the # meant that the entire thing would make more sense.

And that’s a fair thought – except for one problem. The # by itself doesn’t “mean” anything. It isn’t like *, ^, + or – in that sense. It’s not an operator.

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Some Follow-Up Regarding ByRef

A reader asked me to clarify something about my previous post. Their question was:

When MyMethod is written as:

Sub MyMethod( i() as integer )
  i = array(10,20,30)
  system.debuglog CurrentMethodName + " i(0) = " + str(i(0)) + " i(1) = " + str(i(1)) + " i(2) = " + str(i(2))
End Sub

What happens if instead of trying to assign a new array you just alter the values in the array passed in?

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The Two-Finger Tap: Undo Gesture for iOS Apps

The only built-in gesture for undo on iOS at the moment is to shake the device. This is not very intuitive to me and I’ve certainly done it by accident many times. The makers of Procreate chose a two-finger tap and have found that their users adapted to it nicely. This gesture is being adopted by more and more iOS developers. Here’s all the code you need to implement the two-finger tap for undo in your Xojo iOS apps.

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3 Things Developers Need To Release Their App Right

So you’ve created an app that you plan to sell, now you’re done, right? Nope, not even close! Developing your app is just step one. Marketing and promoting your app is the key to its commercial success, starting with announcing it. We talked to one successful Xojo developer who has several apps in the App Store. He told us that he spends 50% of his time on development and 50% of his time on marketing. Marketing. You think it’s just something for the Pros or people with a big offering, but it’s not.

Making sure everyone knows about your new app or latest update is really important. I have been in PR/Marketing for many years and have seen it all! The biggest mistake I see is developers forgetting to put a link back to their website or sitelet when talking about their app. In announcements and on social media it’s so important to make sure people can find you easily! Here are the 3 most essential steps you should take when announcing your app (or release) to the world.

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