Adding UIView on top of react native navigation - react-native-navigation

I am using react-native-navigation and trying to add a native view on the top of everything. I initialized the Swift class in AppDelegate and call swift func:
func showUp() {
let window = UIApplication.shared.keyWindow!
let rect = UIView(frame: CGRect(x: 50, y: 50, width: 100, height: 50))
rect.backgroundColor = UIColor.white
window.addSubview(rect) }
The View seemed to be appeared while loading app and then disappears after app is
Thanks in advance)


SwiftUI Add top line to TabBar

How can I add a line/divider on the top of my TabBar for adding some kind of a splitter between my view and TabBar?
I forgot that I have added this code for making the TabBar completely white.
But my shadow color was white, so I just changed it to Gray
extension UITabBarController {
override open func viewDidAppear(_ animated: Bool) {
let appearance = UITabBarAppearance()
appearance.backgroundColor = .white
appearance.shadowImage = UIImage()
appearance.shadowColor = .gray
appearance.stackedLayoutAppearance.normal.iconColor = .black
appearance.stackedLayoutAppearance.normal.titleTextAttributes = [NSAttributedString.Key.foregroundColor:]
self.tabBar.standardAppearance = appearance
You can change color of TabBar line
UITabBar.appearance().separatorColor = .red
UITabBar.appearance().separatorInset = UIEdgeInsets(top: 0, left: -10, bottom: 0, right: 0)

xCode 9: UITextView not initialized

Once I switched to xCode 9, my initialization of a UITextView stopped working:
#IBOutlet weak var txtPirepText: UITextView!
override func viewDidLoad()
if UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiom.pad
self.txtPirepText = UITextView(frame: CGRect(x: 60, y: 380, width: 900, height: 280))
print("IS THIS VALUE NIL? ",self.txtPirepText)
self.txtPirepText.text = ""
self.txtPirepText.font = UIFont(name: "Arial-BoldMT", size: 17)
self.txtPirepText.textColor =
The print shows that the value is nil and the application crashes on trying to set a text.
Does such initialization not work any more? Thank you!

Issue with drawing polylines on iOS11 beta 4?

I'm having trouble drawing polylines, and I think I've deduced it to being an issue with iOS 11 beta 4. It was working yesterday with the same code, and now I've updated to beta 4 and it doesn't draw polylines.
Just confirmed this by trying it in Xcode 8 on iOS 10.3 simulator, and in Xcode 9b4 on the iOS 11b4 simulator.
import MapKit
class ViewController: UIViewController, MKMapViewDelegate {
let mapView = MKMapView()
override func viewDidLoad() {
mapView.frame = CGRect(x: 10, y: 10, width: 300, height: 300)
mapView.delegate = self
mapView.region = MKCoordinateRegionMake(CLLocationCoordinate2D(latitude: 51.482736, longitude: -0.015253), MKCoordinateSpanMake(0.005, 0.005))
mapView.delegate = self
let coordinate1 = CLLocationCoordinate2D(latitude: 51.482736, longitude: -0.015253)
let coordinate2 = CLLocationCoordinate2D(latitude: 51.482736, longitude: -0.016253)
let polyline = MKPolyline(coordinates: [coordinate1, coordinate2], count: 2)
mapView.add(polyline, level: .aboveLabels)
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
let renderer = MKPolylineRenderer(overlay: overlay)
renderer.strokeColor =
renderer.lineWidth = 4.0
return renderer
iOS 10:
iOS 11:
Annotations are added to the map without issue.
Fixed in beta 5. We just had to wait.

PaintCode 2 vs 3 incompatible due to resizableImageWithCapInsets

I recently switched from using PaintCode 2 to PaintCode 3, I am using it together with xCode/Swift.
I noticed however, that all my image generating functions not behave differently. They seam to standard addopt cap insets.
As an example below you can find one canvas "ViewMissingImage", and how its configured in PaintCode (2 or 3 its identical).
Code generated via PaintCode 2
public class func imageOfViewMissingImage(frame frame: CGRect = CGRect(x: 6, y: 5, width: 109, height: 109)) -> UIImage {
UIGraphicsBeginImageContextWithOptions(frame.size, false, 0)
PaintCode.drawViewMissingImage(frame: CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height))
let imageOfViewMissingImage = UIGraphicsGetImageFromCurrentImageContext()
return imageOfViewMissingImage
Code generated via PaintCode 3
public dynamic class func imageOfViewMissingImage(imageSize imageSize: CGSize = CGSize(width: 109, height: 109)) -> UIImage {
UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
PaintCode.drawViewMissingImage(frame: CGRect(x: 0, y: 0, width: imageSize.width, height: imageSize.height))
let imageOfViewMissingImage = UIGraphicsGetImageFromCurrentImageContext()!.resizableImageWithCapInsets(UIEdgeInsetsZero, resizingMode: .Tile)
return imageOfViewMissingImage
I think that the PaintCode 2 never used the capp insets, maybe it was a bug?
I do not want these cap insets, how can I get rid of them?
The solution is straightforward:
Put the Cap Inset on "Stretch" instead of tile in PaintCode UI!

iphone:How to use index number on map pin in MKAnnotation View?

Hello friends,
I am developing a functionality to display index number on map pin and set image on mapview of iPhone so please tell me any link or any idea to develop this functionality.
Thanks in advance.
What is an index number in the context? Is it just a digit that your code is displaying? If so your question is how to display text on a map. Use a map overlay. Same for images. Search for MKMapOverlay and go from there.
I have use this method for index number in annotation view.
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
guard !(annotation is MKUserLocation) else {
return nil
// Better to make this class property
let annotationIdentifier = "AnnotationIdentifier"
var annotationView = MKAnnotationView()
annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
annotationView.frame = CGRect(x: annotationView.frame.origin.x, y: annotationView.frame.origin.y, width: 80, height: 200)
annotationView.annotation = annotation
annotationView.tag = index
index += 1
let imageViewPin = UIImageView(frame: CGRect(x: 0, y: 0, width: 30, height: 40)) = CGPoint(x:, y: - 11)
imageViewPin.image = UIImage(named: "green_pin")
return annotationView
func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {