xamarin-range-slider
xamarin-range-slider copied to clipboard
halkar
Doesn't work on iOS with forms
slider not visible on iOS and after suggested code is added:
#if NETFX_CORE [assembly: Xamarin.Forms.Platform.WinRT.ExportRenderer(, typeof(Xamarin.RangeSlider.Forms.RangeSliderRenderer))] #else [assembly: Xamarin.Forms.ExportRenderer(typeof(Xamarin.RangeSlider.Forms.RangeSlider), typeof(Xamarin.RangeSlider.Forms.RangeSliderRenderer))] #endif
NullReferenceException thrown
project: Test.zip
Thanks @hktari Apparently, range slider ios package is not compatible with new iOS projects. I will try to fix it asap.
Hello @halkar! Did you find a solution? I'm still digging around source to fix this and use the range slider on my new iOS project :)
I got this exception:
Loaded assembly: /.........../Xamarin.RangeSlider.Common.dll [External] Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
But from source code, Xamarin.RangeSlider.Common.dll doesn't contain anything, just an enum type.
I compiled the source code with samples, and it works....
the latest nuget version, is the same of the actual source code??
I just noticed that on iOS sample, inside the main.cs you put:
public class Application
{
// This is the main entry point of the application.
static void Main(string[] args)
{
// if you want to use a different Application Delegate class from "AppDelegate"
// you can specify it here.
UIApplication.Main(args, null, "AppDelegate");
var t = typeof(RangeSliderRenderer); // <---- This line!!!!
}
}
Ok, I found a strange issue: I have to add Xamarin.RangeSlider nuget package too. I added only Xamarin.Forms.RangeSlider. (but this is enough for Droid and UWP)
Now, I got the same exception, but with more detials:
Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
[0:] Eccezione non gestita: MonoTouch - System.NullReferenceException: Object reference not set to an instance of an object
at Xamarin.RangeSlider.RangeSliderControl.get_LowerHandleImageNormal () [0x00096] in <394d04d792de4791b21e337580082f54>:0
at Xamarin.RangeSlider.RangeSliderControl.get_IntrinsicContentSize () [0x0000a] in <394d04d792de4791b21e337580082f54>:0
at Xamarin.RangeSlider.RangeSliderControl.AddSubviews () [0x00010] in <394d04d792de4791b21e337580082f54>:0
at Xamarin.RangeSlider.RangeSliderControl.ConfigureView () [0x000de] in <394d04d792de4791b21e337580082f54>:0
at Xamarin.RangeSlider.RangeSliderControl..ctor (CoreGraphics.CGRect frame) [0x0001d] in <394d04d792de4791b21e337580082f54>:0
at Xamarin.RangeSlider.Forms.RangeSliderRenderer.OnElementChanged (Xamarin.Forms.Platform.iOS.ElementChangedEventArgs1[TElement] e) [0x0001e] in <521f210d41874847a6d12b7429bff1d6>:0 at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x00118] in 1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in <bc5a3d4303744676b3b36f4254bb697d>:0 at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\agent_work\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:193 at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0002a] in D:\agent_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:77 at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\agent_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:45 at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000cc] in 1[TElement].Xamarin.Forms.Platform.iOS.IVisualElementRenderer.SetElement (Xamarin.Forms.VisualElement element) [0x00000] in <bc5a3d4303744676b3b36f4254bb697d>:0 at Xamarin.Forms.Platform.iOS.Platform.CreateRenderer (Xamarin.Forms.VisualElement element) [0x00014] in D:\agent_work\1\s\Xamarin.Forms.Platform.iOS\Platform.cs:193 at Xamarin.Forms.Platform.iOS.VisualElementPackager.OnChildAdded (Xamarin.Forms.VisualElement view) [0x0002a] in D:\agent_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:77 at Xamarin.Forms.Platform.iOS.VisualElementPackager.Load () [0x0001e] in D:\agent_work\1\s\Xamarin.Forms.Platform.iOS\VisualElementPackager.cs:45 at Xamarin.Forms.Platform.iOS.VisualElementRenderer1[TElement].SetElement (TElement element) [0x000cc] in
So the issue is inside this:
public override CGSize IntrinsicContentSize => new CGSize(NoIntrinsicMetric,
Math.Max(LowerHandleImageNormal.Size.Height, UpperHandleImageNormal.Size.Height) + SpaceAboveThumbs);
it seems that LowerHandleImageNormal is null, and LowenHandleImageNormal is:
private UIImage LowerHandleImageNormal
{
get
{
if (_lowerHandleImageNormal != null)
return _lowerHandleImageNormal;
if (IS_PRE_IOS7())
{
var image = ImageFromBundle(Enabled ? @"slider-default-handle" : @"slider-default-handle-disabled");
_lowerHandleImageNormal = image.ImageWithAlignmentRectInsets(new UIEdgeInsets(0, 2, 0, 2));
}
else
{
var image = ImageFromBundle(Enabled ? @"slider-default7-handle" : @"slider-default7-handle-disabled");
_lowerHandleImageNormal = image.ImageWithAlignmentRectInsets(new UIEdgeInsets(-1, 8, 1, 8));
}
return _lowerHandleImageNormal;
}
}
and I'm on iOS 11, so that if the "else" branch which cause the null reference exception.
I ran the Samples demo and it works, I took the Sample example and inserted it into my project as first page.. and I got the exception.
Ok.. now I just copied all the slider*.png into my Resorce folder of the iOS project, and now it works.
@halkar , may you fix it? (also the missing nuget dependency from Xamarin.RangeSlider)
No, I need time to fix it (and I don't have it). @Magic73 mentioned a workaround which you can use.
PR #138 looks like it would fix this bug, can we merge the change and release a new version @halkar?
Did you resolve the issue that was preventing the Xamarin.Forms version from working in iOS? Based on the comments, it does not appear so.
From following the comments, I am understanding that you were able to implement a workaround successfully, and all 3 platforms work for you, but that workaround did not fix it for everybody. Is that correct?
I can't even reference this properly on iOS my refs have a yellow exclaimation mark and in code R# cannot find the RangeSlider class ... odd.
Resolution
- Clone this repo.
- Copy all the slider*.png files into Resources directory of the IOS project.
- Make sure this line is present in the app delegate.cs
[assembly: Xamarin.Forms.ExportRenderer(typeof(Xamarin.RangeSlider.Forms.RangeSlider), typeof(Xamarin.RangeSlider.Forms.RangeSliderRenderer))]
- Also ensure the following is present
var t1 = typeof(Xamarin.RangeSlider.RangeSliderControl);
var t2 = typeof(RangeSliderRenderer);
- Clean and re-build the solution.
- Good to GO.
Can you create a sample project for the solution and when do you update the repository ?
