Bonjour discovery with NetServiceBrowser not working in iOS

i am using NetServiceBrowser for descovering bonjour services but my app is calling only netBrowserServiceWillSearch delegate method and keep on searching the Bonjour service without ever finding or stoping.

class BonjourDiscovery :  NetServiceBrowserDelegate, NetServiceDelegate
{

let serviceBrowser = NetServiceBrowser()
    
    @objc func ListOfPrinter(){
        
        serviceBrowser.delegate = self
        serviceBrowser.searchForServices(ofType: "_printer._tcp", inDomain: "")
    }
    
    func netServiceBrowser(_ browser: NetServiceBrowser, didFind service: NetService, moreComing: Bool) {
        
        print("---------didFind: \(service.name)")
    }
    
    func netServiceBrowserDidStopSearch(_ browser: NetServiceBrowser) {
        print(#function)
    }
    
    func netServiceBrowser(_ browser: NetServiceBrowser, didNotSearch errorDict: [String : NSNumber]) {
        print(#function)
    }

    func netServiceBrowser(_ browser: NetServiceBrowser, didRemove service: NetService, moreComing: Bool) {
        print(#function)
    }
    
    func netServiceBrowserWillSearch(_ browser: NetServiceBrowser) {
        print(#function)
    }
}

info.plist -:

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>NSLocalNetworkUsageDescription</key>
	<string>Looking for local tcp Bonjour service</string>
	<key>NSBonjourServices</key>
	<array>
		<string>_printer._tcp</string>
	</array>
</dict>
</plist>

i have tried diffrent things whatever i found on apple forum or stackOverFlow like adding local in inDomain ,replacing _printer._tcp with _printer._tcp. ,but nothing works so far