How to Hide a View Programmatically

How to hide a View programmatically?

You can call view.setVisibility(View.GONE) if you want to remove it from the layout.

Or view.setVisibility(View.INVISIBLE) if you just want to hide it.

From Android Docs:

INVISIBLE

This view is invisible, but it still takes up space for layout purposes. Use with setVisibility(int) and android:visibility.

GONE

This view is invisible, and it doesn't take any space for layout purposes. Use with setVisibility(int) and android:visibility.

I want to hide element/Views programmatically in android

Rather passing view id you should pass view in display method that is more convenient.

First Views Ids are generated automatically so if things you are storing this ids some Where and later used to get views it not right thing because Ids are generated and it different device to device and might change any time when application closed and start again.

You can do it by getIdentifier()

try {
     String buttonID = elementId;//String name of id
     int resID = getResources().getIdentifier(buttonID, "id", getPackageName());
     View view = findViewById(resID);
     if (isVisible) {
        view.setVisibility(View.VISIBLE);
     } else {
        view.setVisibility(View.GONE);
    } catch (Exception e) {
        e.printStackTrace();
    }

as above we are passing view id with combination of i and j values and then using getIdentifier() method to make Views objects .

I thing above code is solution towards your problem.

Showing and hiding a view controller programmatically

Good evening.

Based on your question i assume you're networkconnection check works as it should. I would display the banner in the following way:

1. create the banner using a new .swift file containing the following code:

   class BannerViewLauncher: NSObject  {
   
       var viewController: UIViewController?
   
       lazy var bannerView : UIView = {
           let view = UIView(frame: .zero)
           view.backgroundColor = .lightGray
           return view
       }()
   
       //create more UIelements if you want to design the banner further. don't forget to add them as subviews to the bannerView and give them constraints.
   
       func showNoNetworkBanner() {
   
           if let window = UIApplication.shared.keyWindow {
   
               window.addSubview(bannerView)
   
               //define your desired size here (y position is out of view so it is off view by default, the y position will be changed when you call the showNoNetworkBanner() method.
               bannerView.frame = CGRect(x: 0, y: -100, width: window.frame.width, height: 100)
               //change withDuration if you want it to display slower or faster, just change all of them to the same for it so look good
               UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseInOut, animations: {
   
                   self.bannerView.frame = CGRect(x: 0, y: -100, width: window.frame.width, height: 100)
   
               }, completion: nil)
   
           }
       }
   
       func hideNoNetworkBanner() {
           if let window = UIApplication.shared.keyWindow {
           UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseIn, animations: {
   
                   self.bannerView.frame = CGRect(x: 0, y: -100, width: window.frame.width, height: 100)
   
           }, completion: nil)
           }
       }
   
   }
   

2. In the ViewController you would like to display this (one or more) subclass the BannerViewLauncher and call the method as described when your NoNetwork observer methods trigger.

   lazy var bannerViewLauncher : BannerViewLauncher = {
       let launcher = BannerViewLauncher()
       launcher.viewController = self
       return launcher
   }()
   
   //call the following when you want the banner to display
   bannerViewLauncher.showNoNetworkBanner()
   
   //call this when you want to hide the banner
   bannerViewLauncher.hideNoNetworkBanner()
   

Hope this answers your question.

Dynamically hiding view in SwiftUI

Rather than dynamically setting a variable and using it in my view, I found that I was able to hide or show the date picker this way:

struct ContentView : View {
    @State var showDatePicker = true
    @State var datePickerDate: Date = Date()

    var body: some View {
        VStack {
            if self.showDatePicker {
                DatePicker($datePickerDate)
            } else {
                DatePicker($datePickerDate).hidden()
            }
        }
    }
}

Or, optionally, not including the date picker instead of hiding it:

struct ContentView : View {
    @State var showDatePicker = true
    @State var datePickerDate: Date = Date()

    var body: some View {
        VStack {
            if self.showDatePicker {
                DatePicker($datePickerDate)
            }
        }
    }
}

Android: hide an element

Two ways:

XML

in your XML file. If you want to have initial visibility

android:visibility="gone" <-- hides

or

android:visibility="visible" <-- makes it visible

Java

in java file. For when you need to change it programmatically

textView.setVisibility(View.GONE);//makes it disappear

or

textView.setVisibility(View.VISIBLE);//makes it visible again

---

Different visibilities:

• Visible

Says itself: Sets the view to be visible

• Invisible

Hides the view, but it still occupies space.

• Gone

Hides the view, and makes it occupy no space.

The proper way of hiding and showing Android Views?

To show/hide a View programmatically you can use setVisibility(int visibility).

The visibility parameter can be:

• View.VISIBLE - shows the View.
• View.GONE - hides the View and recalculates the layout.
• View.INVISIBLE - hides the View, but still leaves/occupies its space in the layout.

How to show/hide grouped views in Android?

Part one and two should be in their own layout. After, play with the visilibity property of each layout. Specifically to hide any view without it continues to occupy its space, use the value gone for the visibility property.

Ok, here I go. Below you have a complete example of how to hide/show grouped views.

main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/viewsContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="5dp" >

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="TextBox One" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:text="TextBox Two" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="5dp"
            android:text="TextBox Three" />
    </LinearLayout>

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="Hide" />

</RelativeLayout>

Activity

public class MyActivity extends Activity implements OnClickListener {

    private boolean viewGroupIsVisible = true;  

    private View mViewGroup;
    private Button mButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mViewGroup = findViewById(R.id.viewsContainer);

        mButton = findViewById(R.id.button);
        mButton.setOnClickListener(this);
    }

    @Override
    public void onClick(View button) {

    if (viewGroupIsVisible) {
        mViewGroup.setVisibility(View.GONE);
        mButton.setText("Show");
    } else {
        mViewGroup.setVisibility(View.VISIBLE);
        mButton.setText("Hide");
    }

    viewGroupIsVisible = !viewGroupIsVisible;
}

I hope this helps ;)

How do I show and/or hide a subview using swift

You should create IBOutlets for each of the three subviews. Then you can show/hide each of them directly from those references. If you hide a view, it will automatically hide its subviews.

Once you have an outlet for the view, you can do this:

viewYouWantToHide.isHidden = true

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