This question is specific to the NavigationController in the Material iOS framework by CosmicMind. https://github.com/CosmicMind/Material
It looks like the backButtonImage is a public property
public var backButtonImage: UIImage? {
didSet {
if nil == backButtonImage {
backButtonImage = MaterialIcon.arrowBack
}
}
}
I can't seem to set it properly.
(navigationBar as! NavigationBar).backButtonImage = UIImage.fontAwesomeIconWithName(.ChevronLeft, textColor: colorKit.headerTitleText, size: CGSizeMake(30,30))
The framework doesn't include the Material icons, so the back button appears as an empty button by default, which might be confusing to people.
In Material 1.37.0, you can do this:
(navigationBar as? NavigationBar)?.backButtonImage = UIImage(named: "ic_icon_name")
Related
I have a lookup view on my xamarin.iOS app where the user puts their subdomain in and I want the textbox to be to the left of the label that has the parent domain, the image below shows what I basically want to achieve:
I was easily able to achieve this on android using drawables but my iOS skills are not as sharp so I'm lost on how I do this on iOS.
in iOS ,you can implment it in code.
in xxxViewController
public override void ViewDidLoad()
{
base.ViewDidLoad();
UIView backgroundView = new UIView(new CGRect(10,50,View.Bounds.Width-20,30));
UILabel domainLab = new UILabel()
{
Text = " https://www.example.com ",
Font = UIFont.SystemFontOfSize(12),
TextColor = UIColor.Gray ,
BackgroundColor=UIColor.LightGray,
Frame=new CGRect(0,0,150,30)
};
UITextField textField = new UITextField()
{
Frame=new CGRect(150,0,View.Bounds.Width-170,30),
};
textField.Layer.MasksToBounds = true;
textField.Layer.BorderColor = UIColor.LightGray.CGColor;
textField.Layer.BorderWidth = (System.nfloat)0.5;
backgroundView.AddSubview(domainLab);
backgroundView.AddSubview(textField);
View.AddSubview(backgroundView);
// Perform any additional setup after loading the view, typically from a nib.
}
Need to have transparent navigation bar
https://developer.xamarin.com/recipes/ios/content_controls/navigation_controller/change_the_nav_bar_transparency/
tried with this but not working.
Any Suggestion ?
Although, your question is not fully descriptive and not sure what exactly you want to achieve by saying "Not Working" from the given link.
Write following code in respective override methods of the ViewController in which you want to achieve the Transperent NavigationBar for that specific ViewController only.
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
if (NavigationController != null)
{
NavigationController.NavigationBar.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
NavigationController.NavigationBar.ShadowImage = new UIImage();
NavigationController.NavigationBar.Translucent = true;
NavigationController.View.BackgroundColor = UIColor.Clear;
NavigationController.NavigationBar.BackgroundColor = UIColor.Clear;
}
}
public override void ViewWillDisappear(bool animated)
{
base.ViewWillDisappear(animated);
if (NavigationController != null)
{
NavigationController.NavigationBar.SetBackgroundImage(null, UIBarMetrics.Default);
NavigationController.NavigationBar.ShadowImage = null;
NavigationController.NavigationBar.BarTintColor = UIColor.Red; //Provide your specific color here
}
}
If you want to set this Globally, Try it in AppDelegate's FinishedLaunching method :
UINavigationBar.Appearance.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
UINavigationBar.Appearance.ShadowImage = new UIImage();
UINavigationBar.Appearance.BackgroundColor = UIColor.Clear;
UINavigationBar.Appearance.Translucent = true;
Hope this helps!.
A single navigation bar is used for a particular navigation controller in iOS. So if you want to make it transparent for a single VC then you have to make it transparent when you navigate to that VC. And then change it back when you coming back from that VC in viewWillDisappear (or viewDidDisappear) methods.
Is there a way in Xamarin.Forms to handle view containment? Let's say I want to build a vertical TabBar with a container. Normally in iOS I'd utilize a Container View and in Android I'd use Fragments. How would I do this in Xamarin.Forms?
Xamarin.Forms has a TabbedPage Setting the title of the sub pages populates the tabs with their text.
public class MyTabbedPage: TabbedPage
{
public MyTabbedPage()
{
var firstPage = new MyFirstPage
{
Title = "My First Page"
};
var secondPage = new MySecondPage
{
Title = "My Second Page"
};
Title = "Title of my Tabbed Page";
Children.Add(firstPage);
Children.Add(secondPage);
}
}
I have an app with a medium-sized storyboard, which is complicated enough for me not to want to mess around with it too much.
I want to copy this storyboard and change the color scheme and let the user select which color scheme to use.
My question is: can I programmatically select which storyboard will be used by default on startup? If yes - how do I do that?
I looked at a somewhat related question: Storyboards Orientation Support in Xcode 4.5 and iOS 6.x ?
Based on that code I made an extension method:
static bool IsStoryboardLoading {get;set;}
public static T ConsiderSwitchingStoryboard<T> (this UIViewController from) where T: UIViewController
{
if (!IsStoryboardLoading && LocalStorage.Instance.IsWhiteScheme && false) {
try {
IsStoryboardLoading = true;
UIStoryboard storyboard = UIStoryboard.FromName ("MainStoryboard_WHITE", NSBundle.MainBundle);
T whiteView = storyboard.InstantiateViewController (typeof(T).Name) as T;
from.PresentViewController (whiteView, false, null);
return whiteView;
} finally {
IsStoryboardLoading = false;
}
}
return null;
}
}
and then I use it in ViewDidAppear override:
public override void ViewDidAppear (bool animated)
{
this.ConsiderSwitchingStoryboard<MyViewController> ();
}
This code works in some cases but in others it causes an error when performing a push segue:
NSGenericException Reason: Could not find a navigation controller for segue 'segSearchResults'. Push segues can only be used when the source controller is managed by an instance of UINavigationController.
at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging:void_objc_msgSendSuper_IntPtr_IntPtr (intptr,intptr,intptr,intptr)
It might be simpler to just use 1 Storyboard and have 2 sets of controllers in the same storyboard. Just use different storyboard ids for the controllers. You can use the same class on those if needed.
For example:
var whiteController = Storyboard.InstantiateViewController("MyWhiteController") as MyController;
var blueController = Storyboard.InstantiateViewController("MyBlueController") as MyController;
Both could create an instance of MyController, but pull out different layouts from the same storyboard file.
Another option is to use UIAppearance to dynamically set a "style" on all controls of a certain type in your app.
For example, to set the default UIBarButtonItem image throughout your app:
UIBarButtonItem.Appearance.SetBackgroundImage(UIImage.FromFile("yourpng.png"), UIControlState.Normal, UIBarMetrics.Detault);
(You might check my parameters there)
I've created a new class that inherits from TTDefaultStyleSheet.
public class BlackStyleSheet : TTDefaultStyleSheet
{
public BlackStyleSheet() : base()
{
Console.WriteLine("BlackStyleSheet created.");
}
public override UIColor TabBarTintColor
{
get
{
Console.WriteLine("BlackStyleSheet.TabBarTintColor returned.");
return UIColor.Black;
}
}
[Export ("tabTintColor")]
public override UIColor TabTintColor
{
get
{
Console.WriteLine("BlackStyleSheet.TabTintColor returned.");
return UIColor.Black;
}
}
}
And I set this custom style sheet as the default in my FinishedLaunching method.
public override void FinishedLaunching (UIApplication application)
{
Three20.TTStyleSheet.GlobalStyleSheet = new BlackStyleSheet();
Three20.TTDefaultStyleSheet.GlobalStyleSheet = new BlackStyleSheet();
Console.WriteLine("Three20 style sheet set.");
}
Then, I create the actual TTTabStrip and TTTabItem elements within my own custom UIViewController's ViewDidLoad() method. The TTTabItem objects are declared at the class level instead of the method level.
tab1 = new TTTabItem("1");
tab2 = new TTTabItem("2");
tab3 = new TTTabItem("3");
TabStrip = new TTTabStrip();
TabStrip.Frame = new RectangleF(0,0,View.Frame.Width, 44);
TabStrip.TabItems = NSArray.FromNSObjects(tab1,tab2,tab3);
TabStrip.SelectedTabIndex = 0;
View.AddSubview(TabStrip);
When the TTDefaultStyleSheet.GlobalStyleSheet property is set to the new custom stylesheet, the app crashes. When this property setting is removed, the app runs perfectly, but the tab strip remains grey.
In all forums I've read (none seem to be MonoTouch-specific), they all indicate that creating your own stylesheet, then setting it to the global stylesheet is the way to go. But this doesn't seem to work for me with MonoTouch.
Does anyone have any ideas?
Thank you,
John K.
I tried your example in XCode with Objective-C and I can confirm that this this approach does work. I also tried for myself with MonoTouch and saw the same results you report.
I have found several problems in the Three20 binding code in the past that seem to cause aborts like this. You can try and fix up the existing binding code or create only the bindings you need from Three20 manually.
http://docs.xamarin.com/ios/advanced_topics/binding_objective-c_types