When app bar is present, the height of the app bar affects the content on the rest of the page.
For example, if the app bar has a Height of about 25px when ClosedDisplayMode="Minimal", the rest of the content on the page (rootGrid) would have its actual height of Screen Height - 25px. So the app bar is not overlay on page content.
This is visible especially when the content is VerticalAlignment="Center" or Bottom.
Is there any way to avoid this? Something like a ZIndex on the AppBar so that it is displayed over the page content and not trimming it on the bottom side of the screen.
It is possible to tell the renderer that the whole "window" should be used when rendering and not just the visible part. By calling Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().SetDesiredBoundsMode(ApplicationViewBoundsMode.UseCoreWindow) the renderer will include the areas beneath the chrome of the window (ie the system tray on top of the screen and the app bar at the bottom). The chrome will always be on top of whatever is rendered from xaml.
ApplicationView is documented here.
If you don't want the system tray on the top of the screen to overlap the content, you'll have to compensate with a margin on the root container of your visible xaml.
Related
My goal is to view the content of the bottom page from the top of the other content page. In order to accomplish this, I used PushModalAsync to navigate and set the BackgroundColor property of the navigation page to Transparent. I can view the content on the bottom page on Android. However on the iOS platform, a black color is always displayed and I am unable to read the content of the bottom page. Why is the background color always black even when it is set to be transparent in PushModalAsync?
Note: The iOS platform displays a white screen when I change the navigation to PushAsync.
Expected Behavior:
Background color should not be black and it should be transparent when navigating using PushModalAsync
Actual Behavior:
Background color is always black even when the content page background color is set as transparent when navigating using PushModalAsync
Android Screenshot
iOS Screenshot
The issue reproducing sample is provided below:
DemoSample
If you want to do EXACTLY like that, it is not possible (it will require so much work that you can't expect someone to provide you the solution here).
On iOS that control (ViewController) is drawn that way in that presentation mode. So as long as you use that control and that mode it will work that way irrelevant if you use Xamarin or something else. As ViewControllers are most basic controls it is not realistic to replace them with something else. But you can replace presentation mode. In Xamarin.Forms you can do that this way:
<ContentPage ...
xmlns:ios="clr-namespace:Xamarin.Forms.PlatformConfiguration.iOSSpecific;assembly=Xamarin.Forms.Core"
ios:Page.ModalPresentationStyle="FormSheet">
...
</ContentPage>
This will result in somewhat different visual presentation but that is the only way to have one ViewController drawn over another without going into some deep customization that would require tons of code, especially on Xamarin.Forms.
You can also try some other values, but the default value will not work.
In iOS, the hierarchy is managed by the view controller. Each page has a separate view controller. A page consists of a window, a root view, and a subview. You cannot see the layout of the previous page by setting the background color to be transparent.
For more details, you can refer to the following documents:
User interface | Microsoft
The View Controller Hierarchy | Apple
I am using native base tabs to display scrollable tab bars in react-native
I had 4 tabs and the content in each render item tab changes, so the length of the tab bar content changes. how can I adjust the height of the scroll view based on content in tabview. it should not scroll when content is less. it leaves blank space below when content is less.
when content in tab bar render item is more than the screen height it scrolls.
when content in tab bar render item is less than the screen height it should not scroll.
even if the content in the 2nd tab is less it scrolls based on height of 1st tab content height.
It should not scroll if the content on in tab render item is less.It should scroll based on the content in tab view
it's the sole reason why i left native-base because of the issue. It's and open issue with native base and they havent resolved it yet. The problem is that i had 3 tabs and three scrollViews had different height. so it takes the longest height and when we go to any other tab , it leaves blank space.
this is the link to the open issue in github native base tabs . Do check it out if you can find any resolution for it. I couldnt find it so ive switched to
react native tab view . .This is a better library for tabs and coz of the issue in native abse. i switched to it.
Hope it helps. Feel free for doubts
I'm confused as to why the navbar does not collapse at its default breaking point of 768px.
In bootstrap's own example the navbar does not collapse at 768px.
I'm having a problem with this on my own website, and went and tested on bootstraps examples.
I tested bootstraps example page here in this screen emulator. I also tested on a real ipad. Both do not collapse at 768px.
IPad - Screenfly
Bootstrap navbar collapse at viewport width 767px, this means your window width is 781px. If your viewport width reaches 768px or any higher value, your navbar will be displayed normally like you see it on any desktop.
Width viewport 767px
Width viewport 768px or higher
You probably was confused by the window width, anyways, if you want to display the viewport and window size like i did in those screenshots, you need web developer addon for firefox, you can also see it in the screenshot, all you need to do is to press on that Resize button and pick Display Window Size but it also has other cool options like View Responsive Layouts or Resize Window.
Hope this helps.
I implemented tab bar with custom icon sizes to match the design:
The first and the last icon sizes are reduced to fit below the circle line by setting the bar item sizes as follows:
The strange behaviour that happens only on iOS7+ is that when the user taps already active resized tab bar icon for the second time - it gets reduced in size:
And if I tap on it again - it's size is so small that it appears invisible:
This doesn't happen on iOS5 or iOS6.
Is there something that I'm doing wrong here or any right method for reducing tab bar icon size?
Hi may be this is will useful for you.Give the dimension of your tab bar items 30x30 pixels and #2x is 60x60.This is working fine for me. Image inset give the all (0,0,0,0).
Is it possible to change the width of a scroll bar on a form. This app is for a touch screen and it is a bit too narrow.
This is a Windows Forms application? I was able to make a very fat and thick scrollbar by adjusting the "Width" property of my scroll bar control.
Is your scroll bar something you have programmatic access to (i.e. it is a control you added to the form)?
The width of the scrollbars is controlled by Windows. You can adjust the scrollbar width in Display Properties and it will affect all windows on the terminal.