10 Awesome Xamarin.Forms Tips & Tricks

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Michael Ridland

Tips and Tricks for using Xamarin.Forms, a presentation done by Michael Ridland (www.michaelridland.com).

Tecnologia

www.xam-consulting.com www.michaelridland.com
10 Awesome Xamarin.Forms

Tips & Tricks

www.xam-consulting.com www.michaelridland.com
Michael Ridland
www.michaelridland.com

www.xam-consulting.com www.michaelridland.com
Xamarin Specialists - We work with Xamarin
all day and night.

www.xam-consulting.com www.michaelridland.com
Developed Apps WITHOUT Xamarin.Forms

www.xam-consulting.com www.michaelridland.com
Developed Apps WITH Xamarin.Forms

www.xam-consulting.com www.michaelridland.com
I hate Xamarin.Forms
because of this, this, this and that

www.xam-consulting.com www.michaelridland.com
OK, Xamarin.Forms is not perfect
but it’s a trade off !

www.xam-consulting.com www.michaelridland.com
The 10 Tips and Tricks
Goal - Get at least 1 tip for everyone in the room!

Goal - Tips for both beginners and gurus

www.xam-consulting.com www.michaelridland.com
Tip #1 - Learn from github seriously
▪Download the apps and run them
▪github.com/conceptdev
▪github.com/xamarin

www.xam-consulting.com www.michaelridland.com
Tip #2 - Use the Source
Xamarin.Forms Source (Can use Assembly browser in XS)
XLabs Source
* The #1 documentation for Custom Renderers & Native Code!

www.xam-consulting.com www.michaelridland.com
Tip #3 - Be Patient
▪ Mobile is hard, expect to encounter issues and
frustrations
▪ Estimate accordingly, if you’re used to estimating
web projects multiple it by 3-5
▪ Xamarin dev is not a walk in the park, but it has
good outcomes, eg Fast Native App

www.xam-consulting.com www.michaelridland.com
Tip #4 - Don’t fight the Framework
▪ ‘I want Cancel here because that’s how I do it in iOS’…
▪ ‘I want swipe cell because that’s how I do it in iOS’…
▪ You can build nice UI’s with Xamarin.Forms but you just
need to be within it’s constraints.
▪ You can change your UI to match what’s ‘In the box’

www.xam-consulting.com www.michaelridland.com
Tip #4 - Don’t fight the Framework
It’s 3-10 times more expensive
but you can still do anything that you can do in Native
Once you break-out (custom renderer)

www.xam-consulting.com www.michaelridland.com
Tip #5 - Grid can be Awesome
▪ Not difficult to use (nearly as easy as
StackLayout)
▪ Works well with XAML (unlike relative)
▪ Faster than StackLayout
▪ Can be used to create overlays/
advanced UIs

www.xam-consulting.com www.michaelridland.com
Tip #6 - ListView Performance Tips
▪ Step 1 - Use CS over XAML
▪ Step 2 - Use Grid/Absolute Layout
▪ Step 3 - Try FastCell Implementation (link?)
▪ Step 4 - Create a Custom Native Cell
▪ Step 5 - Any tips from the crowd?

www.xam-consulting.com www.michaelridland.com
Tip #7 - TaskCompletionSource
▪ Many NativeAPIs are based on events/callbacks
▪ Use TaskCompletionSource to support async
▪ http://www.michaelridland.com/xamarin/
taskcompletionsource-xamarin-beautiful-async/

www.xam-consulting.com www.michaelridland.com
Tip #7 - TaskCompletionSource

www.xam-consulting.com www.michaelridland.com
Tip #8 - Bindable Property Template

www.xam-consulting.com www.michaelridland.com
Tip #9 - Forms->Native->Forms - The Xamarin.Forms Holy Grail
▪Take a Xamarin.Forms Views and Convert into
a Native View to use
▪Great for using with Custom Renderers
▪Great for using with Native Components
▪Demo!

www.xam-consulting.com www.michaelridland.com
Tip #10 - Add Xamarin.Forms to your MvvmCross App
▪ https://github.com/rid00z/
MvvmCrossNavigationDemo
▪ Perfect if you already have a MvvmCross
application and would like a few Xamarin.Form
pages
▪ Demo!

www.xam-consulting.com www.michaelridland.com
Bonus Tip - MessagingCentreitis Anti-Pattern
•MessageCentre is Great!
•Use it and love it
•But don’t overdo it

www.xam-consulting.com www.michaelridland.com
Bonus Tip - App Statics Anti-Pattern
• Using global statics for Navigation in your App
• It’s a recipe for a big ball of mud
• It’s easy to begin with - but in the end all your code becomes tightly
coupled
Bad - Don’t do this!

www.xam-consulting.com www.michaelridland.com
Bonus Tip - App Statics Anti-Pattern
• The solution! - Use a MvvmFramework with a Navigation Service
Good - Do this!

www.xam-consulting.com www.michaelridland.com
Bonus Tip - Run Sync
• Once in a while you might need to run a async function
synchronously. (For a Native API/Component)

www.xam-consulting.com www.michaelridland.com

www.xam-consulting.com www.michaelridland.com
Bonus Tip - Easy dialogs with Acr-Userdialogs
Easily add Alerts/Prompts/Loading Dialogs using Acr
UserDialogs (https://github.com/aritchie/acr-xamarin-
forms)
- It’s in nuget

www.xam-consulting.com www.michaelridland.com
All Code and Links will be put into a Blog post on
www.michaelridland.com
If you want it today please ask me for it!

www.xam-consulting.com www.michaelridland.com
Q & A
Michael Ridland
michael@xam-consulting.com
www.michaelridland.com

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10 Awesome Xamarin.Forms Tips & Tricks

1. www.xam-consulting.com www.michaelridland.com 10 Awesome Xamarin.Forms Tips & Tricks

2. www.xam-consulting.com www.michaelridland.com Michael Ridland www.michaelridland.com

3. www.xam-consulting.com www.michaelridland.com Xamarin Specialists - We work with Xamarin all day and night.

4. www.xam-consulting.com www.michaelridland.com Developed Apps WITHOUT Xamarin.Forms

5. www.xam-consulting.com www.michaelridland.com Developed Apps WITH Xamarin.Forms

6. www.xam-consulting.com www.michaelridland.com I hate Xamarin.Forms because of this, this, this and that

7. www.xam-consulting.com www.michaelridland.com OK, Xamarin.Forms is not perfect but it’s a trade off !

8. www.xam-consulting.com www.michaelridland.com The 10 Tips and Tricks Goal - Get at least 1 tip for everyone in the room! Goal - Tips for both beginners and gurus

9. www.xam-consulting.com www.michaelridland.com Tip #1 - Learn from github seriously ▪Download the apps and run them ▪github.com/conceptdev ▪github.com/xamarin

10. www.xam-consulting.com www.michaelridland.com Tip #2 - Use the Source Xamarin.Forms Source (Can use Assembly browser in XS) XLabs Source * The #1 documentation for Custom Renderers & Native Code!

11. www.xam-consulting.com www.michaelridland.com Tip #3 - Be Patient ▪ Mobile is hard, expect to encounter issues and frustrations ▪ Estimate accordingly, if you’re used to estimating web projects multiple it by 3-5 ▪ Xamarin dev is not a walk in the park, but it has good outcomes, eg Fast Native App

12. www.xam-consulting.com www.michaelridland.com Tip #4 - Don’t fight the Framework ▪ ‘I want Cancel here because that’s how I do it in iOS’… ▪ ‘I want swipe cell because that’s how I do it in iOS’… ▪ You can build nice UI’s with Xamarin.Forms but you just need to be within it’s constraints. ▪ You can change your UI to match what’s ‘In the box’

13. www.xam-consulting.com www.michaelridland.com Tip #4 - Don’t fight the Framework It’s 3-10 times more expensive but you can still do anything that you can do in Native Once you break-out (custom renderer)

14. www.xam-consulting.com www.michaelridland.com Tip #5 - Grid can be Awesome ▪ Not difficult to use (nearly as easy as StackLayout) ▪ Works well with XAML (unlike relative) ▪ Faster than StackLayout ▪ Can be used to create overlays/ advanced UIs

15. www.xam-consulting.com www.michaelridland.com Tip #6 - ListView Performance Tips ▪ Step 1 - Use CS over XAML ▪ Step 2 - Use Grid/Absolute Layout ▪ Step 3 - Try FastCell Implementation (link?) ▪ Step 4 - Create a Custom Native Cell ▪ Step 5 - Any tips from the crowd?

16. www.xam-consulting.com www.michaelridland.com Tip #7 - TaskCompletionSource ▪ Many NativeAPIs are based on events/callbacks ▪ Use TaskCompletionSource to support async ▪ http://www.michaelridland.com/xamarin/ taskcompletionsource-xamarin-beautiful-async/

17. www.xam-consulting.com www.michaelridland.com Tip #7 - TaskCompletionSource

18. www.xam-consulting.com www.michaelridland.com Tip #8 - Bindable Property Template

19. www.xam-consulting.com www.michaelridland.com Tip #9 - Forms->Native->Forms - The Xamarin.Forms Holy Grail ▪Take a Xamarin.Forms Views and Convert into a Native View to use ▪Great for using with Custom Renderers ▪Great for using with Native Components ▪Demo!

20. www.xam-consulting.com www.michaelridland.com Tip #10 - Add Xamarin.Forms to your MvvmCross App ▪ https://github.com/rid00z/ MvvmCrossNavigationDemo ▪ Perfect if you already have a MvvmCross application and would like a few Xamarin.Form pages ▪ Demo!

21. www.xam-consulting.com www.michaelridland.com Bonus Tip - MessagingCentreitis Anti-Pattern •MessageCentre is Great! •Use it and love it •But don’t overdo it

22. www.xam-consulting.com www.michaelridland.com Bonus Tip - App Statics Anti-Pattern • Using global statics for Navigation in your App • It’s a recipe for a big ball of mud • It’s easy to begin with - but in the end all your code becomes tightly coupled Bad - Don’t do this!

23. www.xam-consulting.com www.michaelridland.com Bonus Tip - App Statics Anti-Pattern • The solution! - Use a MvvmFramework with a Navigation Service Good - Do this!

24. www.xam-consulting.com www.michaelridland.com Bonus Tip - Run Sync • Once in a while you might need to run a async function synchronously. (For a Native API/Component)

25. www.xam-consulting.com www.michaelridland.com

26. www.xam-consulting.com www.michaelridland.com Bonus Tip - Easy dialogs with Acr-Userdialogs Easily add Alerts/Prompts/Loading Dialogs using Acr UserDialogs (https://github.com/aritchie/acr-xamarin- forms) - It’s in nuget

27. www.xam-consulting.com www.michaelridland.com All Code and Links will be put into a Blog post on www.michaelridland.com If you want it today please ask me for it!

28. www.xam-consulting.com www.michaelridland.com Q & A Michael Ridland michael@xam-consulting.com www.michaelridland.com

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