iOS Question Change NavigationBar Appearence

Emme Developer

Well-Known Member
Licensed User
Hi everybody!
I've a Toolbar with some pages. Each TabBarItem in Pages is a NavigationController. I set TintColor in each NavController using this code
B4X:
Dim no As NativeObject = n
    no.GetField("navigationBar").RunMethod("setBarTintColor:", Array(no.ColorToUIColor(0xfff7f7f7)))
    no.GetField("navigationBar").SetField("translucent", False)
    no.GetField("navigationBar").RunMethod("setBarStyle:", Array(0))

and it works. This is the preview

upload_2017-7-26_12-5-33.png

Now, when click on Bar Button i need to show a page that is not stored in main ToolbarPages. So i do this, and it works:

B4X:
Sub BarButton_Click
    Dim info As Informazioni
    Utils.HoldReference = info
    info.Initialize(Me)
    Dim nav As NavigationController = Main.tbc.Pages.Get(Main.tbc.SelectedIndex)
    nav.ShowPage2(info.GetPage,True)
End Sub

My issue now is this
Cattura2.PNG

I'm not able to change Color of Back Button. If is possible, i want also to ellips back button name, to mantain Title in center.
When i try to RunMethod SetBarTintColor i get

B4X:
Application_Start
Device locale: en
Found 49 strings.
loc en
Found 49 strings.
loc EN
Application_Active
Error occurred on line: 19 (Informazioni)
[<B4IViewController 0x7bf92d40> valueForUndefinedKey:]: this class is not key value coding-compliant for the key navigationbar.
Stack Trace: (
  CoreFoundation       __exceptionPreprocess + 189
  libobjc.A.dylib      objc_exception_throw + 49
  CoreFoundation       -[NSException raise] + 17
  Foundation           -[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 232
  Foundation           _NSGetUsingKeyValueGetter + 146
  Foundation           -[NSObject(NSKeyValueCoding) valueForKey:] + 276
  B4i Example          -[B4INativeObject GetField:] + 163
  CoreFoundation       __invoking___ + 29
  CoreFoundation       -[NSInvocation invoke] + 321
  B4i Example          +[B4I runDynamicMethod:method:throwErrorIfMissing:args:] + 1842
B4i Example          -[B4IShell runMethod:] + 525
B4i Example          -[B4IShell raiseEventImpl:method:args::] + 1881
B4i Example          -[B4IShellBI raiseEvent:event:params:] + 1915
B4i Example          __33-[B4I raiseUIEvent:event:params:]_block_invoke + 67
libdispatch.dylib    _dispatch_call_block_and_release + 15
libdispatch.dylib    _dispatch_client_callout + 14
libdispatch.dylib    _dispatch_main_queue_callback_4CF + 1053
CoreFoundation       __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 14
CoreFoundation       __CFRunLoopRun + 2445
CoreFoundation       CFRunLoopRunSpecific + 372
CoreFoundation       CFRunLoopRunInMode + 123
GraphicsServices     GSEventRunModal + 71
GraphicsServices     GSEventRun + 80
UIKit                UIApplicationMain + 148
B4i Example          main + 140
libdyld.dylib        start + 1
)

Anyone can help me? Thanks!
 

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Emme Developer

Well-Known Member
Licensed User
Hi,

Can you please post the code, which causes the error?

Jan
I tried these, but same things

B4X:
    Dim objnavbar As NativeObject = mpa
    objnavbar.getfield("navigationbar").runmethod("setbartintcolor:", Array(objnavbar.colortouicolor(0xfff7f7f7)))
    objnavbar.getfield("navigationbar").setfield("translucent", False)

'Mpa is the page

B4X:
Dim OBJNavBar As NativeObject =  Main.tbc.Pages.Get(Main.tbc.SelectedIndex)
    OBJNavBar.GetField("navigationBar").RunMethod("setBarTintColor:", Array(OBJNavBar.ColorToUIColor(0xfff7f7f7)))
    OBJNavBar.GetField("navigationBar").SetField("translucent", False)

'In this i don't get error, but doesn't change nothing

B4X:
NavControl = Main.NavControl
    Dim OBJNavBar As NativeObject = NavControl
    OBJNavBar.GetField("toolbar").RunMethod("setBarTintColor:", Array(OBJNavBar.ColorToUIColor(0xfff7f7f7)))
    OBJNavBar.GetField("navigationBar").RunMethod("setBarTintColor:", Array(OBJNavBar.ColorToUIColor(0xfff7f7f7)))
    OBJNavBar.GetField("navigationBar").SetField("translucent", False)
    NavControl.NavigationBarVisible = True
 
Upvote 0

Emme Developer

Well-Known Member
Licensed User
I finally achieve how to change color of Back Button:

B4X:
Dim OBJNavBar As NativeObject =  Main.tbc.Pages.Get(Main.tbc.SelectedIndex)
    OBJNavBar.GetField("navigationBar").RunMethod("setTintColor:", Array(OBJNavBar.ColorToUIColor(0xffec7b53)))

Now, my issue is to ellipse text of back button
 
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