I have a Xamarin Forms application, which has 2 buttons on the toolbar. Currently I'm using FreshMVVM (and it's navigation). I want to load pages without putting them into the navigation. I do not want to have the 'back' button on the toolbar, also I do not want the user return the last page.
Here's how I push a page currently:
CoreMethods.PushPageModel<FirstChoicePageModel>();
I tried to push as a modal, but that way the toolbar buttons does not work until I press back. Should I make new navigation containers and switch to them if I push the buttons?
It's been a little while since I've used FreshMVVM, but if I recall correctly, you have 2 options:
If you want to completly reset the nav stack, you can do CoreMethods.PushPageModelWithNewNavigation<FirstChoicePageModel>();
If you want to keep the nav stack, you can set NavigationPage.SetHasBackButton(this, false); in the code behind of the view.
For both of these options, it may necessary to intercept the back button on Android. In the code behind there is an overrideable method:
protected override bool OnBackButtonPressed()
{
return true; // prevent Xamarin.Forms from processing back button
}
If you want to show a page, but you doesn't want to navigate (change the current page), you can always use Popups.
See this link https://github.com/rotorgames/Rg.Plugins.Popup
Related
I want to use template 10 to develop my app, but I dont know how can I hide the back button once I pass from one page to another, like for example passing from a login page to my main page.
With template 10 it always show the back button, I know how to prevent from going back, but still I can see the damn back button on the shell, I dont wish to see it.
How could I hide it?
ClearHistory is located on the HamburgerButtonInfo as a DP and if that isn't enough you can thru the NavigationService call ClearHistory as well which looks like public void ClearHistory() => FrameFacade.BackStack.Clear(); in the source so you know what it actually calls...
I am working on Xamarin forms shared project with a master detail page. When I run the app the master detail page is the first item that loads yet it shows the back button which once clicked opens the navigation (master) drawer. This makes no navigation sense whatsoever! I have tried to hide the back button but have not been able to do this. Has anyone come across this and succeeded in doing this? I would prefer a programmatical solution rather than a xaml one.
I have tried adding the below code:
NavigationPage.SetHasBackButton(this, false);
But this doesn't work. I want to keep the toolbar as I will be adding my own menu items here but want the back button gone.
Try this:
NavigationPage.SetBackButtonTitle(this, string.Empty);
NavigationPage.SetHasBackButton(this, false);
I asked a question recently about how to disable the back button is Android, after a while I got it working with these lines of code
public override void OnBackPressed ()
{
// base.OnBackPressed (); /* Comment this base call to avoid calling Finish() */
// Do nothing
}
And just recently someone commented this
Disabling the back button is counter-intuitive and breaks the device
usage contract imposed by Android. So i suggest you rethink.
-Question-
What would be a possible change to this? I dont want to be able to press the back button when playing my quiz game because that would make be able to cheat. New to android Development
Instead of simply making the back button do nothing, you could have it create a popup asking something along the lines of "Are you sure you want to leave the quiz? (This will count as a loss)". And have it take the user back to the main page of your app if he confirms (instead of back to the previous page).
Why not imitate what many websites do and make it so going 'back' to a page works but doesn't display any information?
It depends on your code, but perhaps you can make your buttons and text (or whatever it is you don't want them interacting with) change to be unseen whenever they move on to a new page. Or just throw up a message that says 'You can't do that' to cover the page that they'll only ever see if they go back to view it again.
I want to display an intro view (tutorial) on my monotouch app that when the user clicks on a button will take them to the main storyboard, which contains a UITabController.
I'm new to monotouch and can't work out how to do this. I'm adding an extra view that's been created to the tab bar controller in the AppDelegate.FinishedLaunching, but this always adds the button to the tab bar.
When the user has clicked the button once I don't want to show the intro page ever again, it's a one time deal (I'll save some value to disk to work this out), so I don't want to just add it to the tab controller.
Incidentally if anyone can show me where monotouch decides that it's going to start with the storyboard please let me know. The only thing I've found is the little start arrow that you drag around in XCode, but what if I have two storyboards and I want to load one based on the user being logged in or something.
You need to create simple entry ViewController with the button (Controller1). The next controller in storyboard will be the tabcontroller (TabController).
Thus you will always has the first entry screen in your application.
If you don't want to show it later than make transition from Controller1 to TabController before it is loaded. For example, override the ViewWillAppear method.
The second approach. Use this code to launch whatever you want view above all your controllers at any time:
UIViewController root= UIApplication.SharedApplication.KeyWindow.RootViewController
UIView myCustomView=new MyCustomView();
root.Add(myCustomView);
//call myCustomView.RemoveFromSuperview() and it will be dismissed
I am currently working on an app for WP7 for my university, and need a temporary solution to a problem. Now this solution is, that I will be loading a webpage using the web browser control for WP7. For example: http://m.iastate.edu/laundry/
Now as you see on the webpage, there are certain elements I want to hide, for example the back button. For now, what I have done to handle the back button is something like this:
private void webBrowser1_Navigating(object sender, NavigatingEventArgs e)
{
// Handle loading animations
// Handle what happens when the "back" button is pressed
Uri home = new Uri("http://m.iastate.edu/");
// The the current loading address is home
// Cancel the navigation, and go back to the
// apps home page.
if (e.Uri.Equals(home))
{
e.Cancel = true;
NavigationService.Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
}
}
Now that works beautifully, except for the part that there is a back button on the hardware.
So my second option is to completely hide the back button ONLY on that page, and not its children. So not on http://m.iastate.edu/laundry/l/0
I am still debating on just parsing the data and displaying it in my own style, but I'm not sure if that's completely needed seeing how the data needs constant internet service and is already in a well-put format. Plus, I feel like that would be a waste of resources? Throw in your opinions on that too :)
Thanks!
You should inject a script in the page with InvokeScript.
Here is the kind of Javascript code you need to remove the back button:
// get the first child element of the header
var backButton = document.getElementsByTagName("header")[0].firstChild;
// check if it looks like a back button
if(backButton && backButton.innerText == "Back") {
// it looks like a back button, remove it
document.getElementsByTagName("header")[0].removeChild[backButton];
}
Call this script with InvokeScript:
webBrowser1.InvokeScript("eval", "(function() { "+ script +"}()");
Warning: IsScriptEnabled must be set to true on the web control
If the removal of the back button depends of the page, just test the navigating URI in C# and inject the script if neeeded.