Swift, can't open second app using 'deep link' - ios

Question

It seems I can't open the second app using my method. Nothing happened. Is there any silly mistakes here?
My second app .plist file
My first app code
#IBAction func btnCRM(sender: AnyObject) {
var customURL: NSString = "CRM://"
if (UIApplication.sharedApplication().canOpenURL(NSURL(fileURLWithPath: customURL as String)!)){
UIApplication.sharedApplication().openURL(NSURL(fileURLWithPath: customURL as String)!)
}
}

Answer 1

In addition to the URL Schemes under Item 0, you need to add URL identifier which is CFBundleURLName, as outlined here.

Answer 2

try this code:
let url = NSURL(string: "CRM://")
if (UIApplication.sharedApplication().canOpenURL(url!)) {
UIApplication.sharedApplication().openURL(url!)
}

Answer 3

'openURL' was deprecated in iOS 10.0
Updated version:
guard let url = URL(string: "CRM://"), UIApplication.shared.canOpenURL(url) else {
return
}
UIApplication.shared.open(url, options: [:], completionHandler: nil)

Answer 4

Swift 5.7 2023
The code below opens the main application
private func openMainApp() {
self.extensionContext?.completeRequest(returningItems: nil, completionHandler: { _ in
guard let url = URL(string: self.appURL) else {
return
}
_ = self.openURL(url)
})
}
// Courtesy: https://stackoverflow.com/a/44499222/13363449 👇🏾
// Function must be named exactly like this so a selector can be found by the compiler!
// Anyway - it's another selector in another instance that would be "performed" instead.
#objc private func openURL(_ url: URL) -> Bool {
var responder: UIResponder? = self
while responder != nil {
if let application = responder as? UIApplication {
return application.perform(#selector(openURL(_:)), with: url) != nil
}
responder = responder?.next
}
return false
}