When I open TabbedPage from another TabbedPage in Xamarin.Forms for iOS the right part of bottom bar has that strange glitch/blink. Is there any solution to fix it?
There might be a need to reconsider UX in the app you are working on. Nested tabs are not intuitive and very confusing, beside the technical issues you can run into, here is a summary of notes from the official Xamarin.Forms docs:
It's recommended that a TabbedPage should be populated with
NavigationPage and ContentPageinstances only. This will help to ensure
a consistent user experience across all platforms.
The TabbedPage does not support UI virtualization. Therefore,
performance may be affected if the TabbedPage contains too many child
elements.
While it's acceptable to place a NavigationPage into a TabbedPage,
it's not recommended to place a TabbedPage into a NavigationPage. This
is because, on iOS, a UITabBarController always acts as a wrapper for
the UINavigationController. For more information, see Combined View
Controller Interfaces in the iOS Developer Library.
Related
I'm using Shell in my Xamarin Forms app together with a bottom tabbar and no flyout menu.
Is it somehow possible to have a static view/control between the content page and the bottom tabbar?
(As an example, look at Spotifys mini-player that's constantly shown above the bottom tabbar)
I have tried to use a ControlTemplate in the ContentPage, but it works so-so.
When navigating between pages, the entire view is "slided away", thus it's noticeable that the control is not static and instead instantiated per each page.
Deactivating animations partially solves it but makes the application feel very static and is thus not an acceptable solution.
Anyone got an idea of how this can be solved?
It's quite easy to solve it with Xamarin.Android and Xamarin.Ios, but this needs to be done in Xamarin Forms.
Thanks in advance.
I am implementing Prism in a new Xamarin Forms App. I have been using Rg.Plugins.Popup in the app before converting to Prism.
What are the limitation on the Prism Dialogs vs Prism.Plugin.Popups?
What are some examples when you would use one over the other?
Thank you!
Rg.Plugins.Popup is a popular plugin for Xamarin.Forms which accesses the native functionality to provide a "Modal Popup" which traditionally has not been achievable with Xamarin.Forms.
Dialogs in Prism 7.2
If you're using Prism 7.2 you'll find that the DialogService locates the currently displayed page and then "reparent's the content". Or in other words it takes the content of the active Content Page and places it as the root child of an AbsoluteLayout, placing a mask layer and finally your dialog on top. As a result of this approach you'll notice that any navigation bars for instance on the NavigationPage or TabbedPage, or a MasterDetailPage's menu will remain accessible to the user.
While in some regard both the PopupPage and Dialog may look very similar as you can probably tell there is some significant divergence there.
Dialogs in Prism 8
If you're using Prism 8.0 you'll see that we have updated to the latest Xamarin.Forms and as a result we are able to take advantage of a new feature in Xamarin.Forms which allows you to present a Modal Page with a Transparent background. This in effect allows you to replicate the effect of a PopupPage with either some benefits or drawbacks depending on how you look at it.
With Rg.Plugins.Popups you have the ability to push a PopupPage on top of whatever page is currently displayed from anywhere in the app
With Xamarin.Forms page's that have been pushed Modally they are part of your active Navigation Stack
Using the a traditional page with a transparent background and Modal Navigation you in effect have replicated the appearance of what you get with a PopupPage
Limitations
Prism.Plugin.Popups has the benefit of being integrated into the Navigation Service. As such you can inject the Navigation Service into the ViewModel of a PopupPage, and the PopupPage will be dismissed when you navigate away from it to another non PopupPage.
Dialogs are not part of the Navigation Stack tracked by Prism's Navigation Service. Navigation in Xamarin.Forms is dependent on navigating FROM a specific page. Since Prism's NavigationService doesn't know about the Dialog you will need to dismiss the dialog before navigating.
Other Key Differences
Besides what I've mentioned so far the only real difference is that Rg.Plugins.Popup gives you some added animations which honestly I've seen very few people using.
I checked almost every demo application from the website, but nobody use tabview, only Gridlayout or docklayout for "tabbing" purposes. What is the benefit of the Gridlayout instead of tabview? Apart from the customize the background.
My point is to have a native tab look and feel on every page.
If I have page 1, page 2, page 3, all the page components should have the same tabview/GridLayout part, or I can move out the tabview section to an individual global component?
Apologize for the basic question.
Thanks!
If you are looking for pure native look and feel, you would go with a TabView. Another advantage with TabView is lazy loading, it loads the page only when required.
You may go with GridLayout when you want to keep the TabView look similar on both iOS and Android. iOS by default uses Tabs at bottom and Androids places them at top. iOS would give you a More tab when the number of tab exceeds the available space, on Android it will be scrollable. These are by native, so if you want a customised common look and feel, then you could use GridLayout. Or still you could use the TabView and replace the TabBar with your own custom view, which is a bit complicated.
If you want the tabs on every page, then you should probably have a Frame inside each tab and load your pages there. So the TabBar remains same on every page. The same could be achieved with GridLayout, it's all about choices. I personally like sticking with the native look and feel of platform.
Architecture question: Are there components or a convention to follow to implement a cross platform navigation drawer / side menu? I've found platform specific implementations that aren't similar enough to be implemented consistently in a cross platform way. The MvvmCross iOSSupport library's Xamarin.Sidebar seems to be specific to iOS, as is the stock DrawerLayout on Android, but their implementations seem too different. Does a one size fits all solution exist, or will I have to roll my own?
If you are talking about Xamarin.Forms, this is exactly how MasterDetailPage works. If you ask for Xamarin.Android and Xamarin.iOS the question isn't logically consistent - even if you could display an empty panel by some unified package there is no way that you could add controls to it as it has to be done completely separately (as there are no common controls) and the common package for this cannot be made.
What you are describing is the MasterDetail
The Xamarin.Forms MasterDetailPage is a page that manages two related
pages of information – a master page that presents items, and a detail
page that presents details about items on the master page.
In Xamarin.Forms I have created a custom Navigation bar using a StackLayout and Labels for one of my pages. The other pages however are using the default navigation bar. I've tried to make the titles of the custom and default navigation bars look exactly the same but can't quite get it to match.
Is there a way to find out the font size and family of the default navigation bar in Xamarin.Forms?
Yes, there is! Xamarin.Forms is fully open-source, so you can inspect anything the code is doing on GitHub. The magic most likely happens inside the NavigationPage renderers, so check out Xamarin.Forms.Platform.[Target Platform]/Renderers/NavigationPageRenderer.cs.
But in your case this might be overkill, and you might be able to get the information you are interested in using the Xamarin Inspector while your app is running in debug mode.