mvvmhelpers | behavior library for all XAML based frameworks | Form library

by markjulmar C# Version: Current License: MIT

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kandi X-RAY | mvvmhelpers Summary

mvvmhelpers is a C# library typically used in User Interface, Form, Xamarin applications. mvvmhelpers has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

MvvmHelpers is a cross-platform library for creating applications using the Model-View-ViewModel pattern which was popularized by the XAML frameworks. There are several examples available here where I've been blogging on how to use this library. I'll push some of that information up here as well. You can install MvvmHelpers through NuGet - just search for MVVMHelpers.PCL, it will add the latest version into your project automatically from within Visual Studio if you install the NuGet plug-in.

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Support

mvvmhelpers has a low active ecosystem.

It has 16 star(s) with 7 fork(s). There are 6 watchers for this library.

It had no major release in the last 6 months.

mvvmhelpers has no issues reported. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of mvvmhelpers is current.

Quality

mvvmhelpers has 0 bugs and 0 code smells.

Security

mvvmhelpers has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

mvvmhelpers code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

mvvmhelpers is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

mvvmhelpers releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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mvvmhelpers Key Features

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mvvmhelpers Examples and Code Snippets

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Community Discussions

Trending Discussions on mvvmhelpers

Can't figure out SimpleAudioPlayer.CrossSimpleAudioPlayer, it most likely cannot find the file (System.Reflection.TargetInvocationExceptio)

BInding textColor in Xamarin

Xamarin Entry Binding to MVVM

Xamarin Forms ListView Grouping Contents not Binding

The name 'InitializeComponent' doesn't exist in the current context

Enable button without exposing model properties

Getting 'ITMS-90338: Non-public API usage' and 'ITMS-90809: Deprecated API Usage' upon submitting Xamarin iOS to Apple AppStoreConnect TestFlight

Hide and Show other fields with Bindings and MVVM with Xamarin

XF Binding .. property not found but only with my Android application and not with iOS

Bluetooth Scan throwing ArgumentOutOfRangeException in Xamarin.iOS

QUESTION

Can't figure out SimpleAudioPlayer.CrossSimpleAudioPlayer, it most likely cannot find the file (System.Reflection.TargetInvocationExceptio)

Asked 2021-Dec-31 at 08:01

My attempted implementation

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ANSWER

Answered 2021-Dec-30 at 00:21

I was being a bit of an idiot, but just in case anyone is having problems with this

Put in main folder as embeddedresource:

Source https://stackoverflow.com/questions/70520667

QUESTION

BInding textColor in Xamarin

Asked 2021-Nov-29 at 12:20

In a Xamarin app I’m trying to bind a textcolor with a property in Message model.

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ANSWER

Answered 2021-Nov-26 at 06:18

You could change the item color to gray when you click the item to triger the SelectionChanged event of CollectionView.

Xaml:

Source https://stackoverflow.com/questions/70116671

QUESTION

Xamarin Entry Binding to MVVM

Asked 2021-Aug-25 at 08:35

I am trying to implement everything I can with MVVM rather than code behind, but if I have many objects that I need to access when the entry changes, I don't know how to do it well if at all.

Xaml:

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ANSWER

Answered 2021-Aug-13 at 08:47

Yes, you can create a model and create different properties for different controls. I created a simple demo based on your code(take the PriceDifLabel 's text and text color for example).

You can refer to the following code:

1.create a model MyViewModel.cs and implement interface INotifyPropertyChanged.

And when we change the value of UpdatedCost(bind for Entry UpdatedCost),we can also change the PriceDif accordingly.

MyViewModel.cs

Source https://stackoverflow.com/questions/68767715

QUESTION

Xamarin Forms ListView Grouping Contents not Binding

Asked 2021-Aug-06 at 22:57

I am having issues using ListView Grouping to get the content of my lists to display in labels. The ListView's ItemsSource and GroupDisplayBinding are setting properly, but the label inside the ListView will not display anything (I even tried setting it to a literal string). All of my lists, as well as my "list of lists" are populating correctly. I have poured over the documentation, website articles, and instructional videos but I am still stuck. Can someone point me in the right direction? I am still having a tough time with databinding and MVVM in general. Thanks.

View:

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ANSWER

Answered 2021-Aug-06 at 22:06

You need a as the child node of your :

Source https://stackoverflow.com/questions/68674287

QUESTION

The name 'InitializeComponent' doesn't exist in the current context

Asked 2021-Jun-07 at 12:47

I know that this error has many answers, but they are all some system errors or smth like that. I just created this app and it worked fine. Then I added a view-model to handle my navigation between the register and login page and in login/register.xaml I updated the text to know on what page I'm. But now InitializeComponent is not recognized.

I put only Register page because login is the same but with login name:

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ANSWER

Answered 2021-Jun-06 at 19:54

There is a typo mistake in your Register.xaml, that results in different namespace between the xaml and the cs partial definition of your Register class.

You have

Source https://stackoverflow.com/questions/67862965

QUESTION

Enable button without exposing model properties

Asked 2021-May-12 at 12:13

I am using the MVVM pattern with MVVMHelpers.

I already made the login form, but I was trying to enable the button only if the user has typed his username and password.

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ANSWER

Answered 2021-May-12 at 12:06

You could achieve this in XAML only, by using a multi-binding on the IsEnabled property on the Sign In Button to the user name and the password TextBoxes along with a custom value converter that converts the bound strings to a bool that indicates whether they are empty or not.

However, in this case that is not possible, since you should avoid using Command and IsEnabled at the same time, as it can lead to strange behavior. Commands offer a mechanism to determine, if an action is possible or not and will in turn set the IsEnabled state.

A command can indicate whether an action is possible by implementing the CanExecute method. A button can subscribe to the CanExecuteChanged event and be disabled if CanExecute returns false or be enabled if CanExecute returns true.

As you can see, setting both a Command and IsEnabled will interfere with each other. Although it might work, if you specify IsEnabled before Command in XAML, this is a brittle solution, so choose one, in this case favor Command with its built in mechanism.

The good news is that instead of doing this in XAML, you can achieve the same in your view model and save yourself some code by passing a CanExecute delegate to your LoginCommand as follows.

Source https://stackoverflow.com/questions/67502229

QUESTION

Getting 'ITMS-90338: Non-public API usage' and 'ITMS-90809: Deprecated API Usage' upon submitting Xamarin iOS to Apple AppStoreConnect TestFlight

Asked 2021-Feb-10 at 10:55

We're receiving the following message upon submitting our Xamarin.Forms iOS app to Apple's TestFlight.

the Message:

Dear Developer,

We identified one or more issues with a recent delivery for your app, "[bundle name]" [bundle version] ([bundle version]). Please correct the following issues, then upload again.

ITMS-90338: Non-public API usage - The app references non-public selectors in [project name]: applicationWillTerminate, fontWeight, newSocketQueueForConnectionFromAddress:onSocket:, setOrientation:animated:, socket:didConnectToHost:port:, socket:didReadPartialDataOfLength:tag:, socket:didReceiveTrust:completionHandler:, socket:didWritePartialDataOfLength:tag:, socket:shouldTimeoutReadWithTag:elapsed:bytesDone:, socket:shouldTimeoutWriteWithTag:elapsed:bytesDone:, socketDidCloseReadStream:, socketDidSecure:, terminateWithSuccess. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. For further information, visit the Technical Support Information at http://developer.apple.com/support/technical/

ITMS-90809: Deprecated API Usage - New apps that use UIWebView are no longer accepted. Instead, use WKWebView for improved security and reliability. Learn more (https://developer.apple.com/documentation/uikit/uiwebview).

Best regards,

The App Store Team

I have looked up the messages and made too many attempts to no avail. I'd appreciate it if someone could help having Apple to accept our submission.

Let me share more details about

the Environment:

This is a Xamarin.Forms app that we build using Azure DevOps's build pipelines (specifically, Xamarin.iOS task version 2.*) and release using Azure DevOps's release pipelines. We release that to Microsoft AppCenter and we then download the *.ipa from there. We submit it to Apple's AppStoreConnect TestFlight using Transporter app on the Mac from Apple's AppStore.

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ANSWER

Answered 2021-Feb-10 at 02:23

There are two reasons why Apple reject this submitted version.

ITMS-90338: Non-public API usage - The app references non-public selectors in [project name]: applicationWillTerminate, fontWeight, newSocketQueueForConnectionFromAddress:onSocket:, setOrientation:animated:, socket:didConnectToHost:port:, socket:didReadPartialDataOfLength:tag:, socket:didReceiveTrust:completionHandler:, socket:didWritePartialDataOfLength:tag:, socket:shouldTimeoutReadWithTag:elapsed:bytesDone:, socket:shouldTimeoutWriteWithTag:elapsed:bytesDone:, socketDidCloseReadStream:, socketDidSecure:, terminateWithSuccess.

This means that you need to modify the list names of methods with another name, because these names will conflict with the private method names of Apple's system. You need to find them and replace them with other names.

ITMS-90809: Deprecated API Usage - New apps that use UIWebView are no longer accepted. Instead, use WKWebView for improved security and reliability.

Starting in April 2020, Apple will reject apps that still use the deprecated UIWebView API. While Xamarin.Forms has switched to WKWebView as the default, there is still a reference to the older SDK in the Xamarin.Forms binaries. Current iOS linker behavior does not remove this, and as a result the deprecated UIWebView API will still appear to be referenced from your app when you submit to the App Store.

A preview version of the linker is available to fix this issue. To enable the preview, you will need to supply an additional argument --optimize=experimental-xforms-product-type to the linker.

Detailed steps can refer to UIWebView Deprecation and Xamarin.Forms.

Source https://stackoverflow.com/questions/66119480

QUESTION

Hide and Show other fields with Bindings and MVVM with Xamarin

Asked 2020-Nov-06 at 07:47

I am trying to have something like this in the middle of my page:

The point is to swap in displaying something clicking in the first option and display something else in the second one.

but my code is not working and looks like this, doing nothing:

this is my Xaml:

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ANSWER

Answered 2020-Nov-06 at 07:47

There are two problems with shared code.

First is the GestureRecognizers used for Lable(background color for testing) need to modify as follows:

Source https://stackoverflow.com/questions/64709397

QUESTION

XF Binding .. property not found but only with my Android application and not with iOS

Asked 2020-Oct-01 at 05:17

Here is the error message I am seeing in the Application output:

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ANSWER

Answered 2020-Oct-01 at 05:17

How to avoid the "Warning"

Change the constructor of HomeTabPage to

Source https://stackoverflow.com/questions/64014888

QUESTION

Bluetooth Scan throwing ArgumentOutOfRangeException in Xamarin.iOS

Asked 2020-May-13 at 15:51

I have a BLE scanning app that uses this plugin to continuously scan for nearby devices. When devices are discovered, they are added to an ObservableRangeCollection (from James Montemagno's MvvmHelpers). If the device is already in the list and some of its data (eg, RSSI strength) changes, the collection is updated using ReplaceRange(). If the device has been in the list for too long without updating, it is removed from collection.

This is all working smoothly on Android, but it throws an ArgumentOutOfRange exception on iOS. The exception doesn't always come at the same time, but if I leave the app running for long enough, it will eventually throw. Unfortunately, the stack trace doesn't point to anything in my code, so it's hard to tell whether this is something going on with the BLE Plugin, the ObservableRangeCollection plugin, or even Xamarin.Forms.

Here is the exception message and stack trace:

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ANSWER

Answered 2020-May-13 at 15:51

So it turns out that the BLE scan, which runs continuously, was producing a race condition where an item was being removed at the same time that the list was being updated with removed devices.

Invoking on main thread and adding a lock to the property seems to keep that exception from throwing:

Source https://stackoverflow.com/questions/61758313

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install mvvmhelpers

You can download it from GitHub.

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For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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