Swift: Remote control buttons for audio Session on lock screen

Make a file to subclass the UIApplication

make the class to respond to events

import UIKit

import Foundation

@objc(MyTest2) class MyTest2: UIApplication

{

    

    

   override func canBecomeFirstResponder() ->Bool{

        return true

    }

   override func remoteControlReceivedWithEvent(event: UIEvent) {

    }

    

}

and use the class in main.m

#import <UIKit/UIKit.h>

#import "AppDelegate.h"

#import "test3-swift.h"

int main(int argc, char * argv[]) {

    @autoreleasepool {

        return UIApplicationMain(argc, argv, NSStringFromClass([MyTest2 class]), NSStringFromClass([AppDelegate class]));

    }

}

and now activate the audioSession and use MPNowPlayingInfoCenter class. Make sure audioSession is not mixing with other.

I have used it in a view controller file

- (void)viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    

    /*

     *  Without some sort of

     *  audio player, the remote

     *  remains unavailable to this

     *  app, and the previous app will

     *  maintain control over it.

     */

    if ([[UIApplication sharedApplication] respondsToSelector:@selector(beginReceivingRemoteControlEvents)]){

        [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];

        [self becomeFirstResponder];

    }

    

    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

    

    if(![[AVAudioSession sharedInstance] setActive:YES error:nil])

    {

        NSLog(@"Failed to set up a session.");

    }

    _player = [[AVPlayer alloc] initWithURL:[NSURL URLWithString:@"http://stream.jewishmusicstream.com:8000"]];

    

    /*  Kicking off playback takes over

     *  the software based remote control

     *  interface in the lock screen and

     *  in Control Center.

     */

    

    [_player play];

    

    

    Class playingInfoCenter = NSClassFromString(@"MPNowPlayingInfoCenter");

    

    if (playingInfoCenter) {

        

        

        NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];

        

        

        MPMediaItemArtwork *albumArt = [[MPMediaItemArtwork alloc] initWithImage: [UIImage imageNamed:@"abc.jpg"]];

        

        [songInfo setObject:@"Audio Title" forKey:MPMediaItemPropertyTitle];

        [songInfo setObject:@"Audio Author" forKey:MPMediaItemPropertyArtist];

        [songInfo setObject:@"Audio Album" forKey:MPMediaItemPropertyAlbumTitle];

        [songInfo setObject:albumArt forKey:MPMediaItemPropertyArtwork];

        [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo];

        

        

    }

    

    

}

swift: Using UIApplication Subclass in main.m

Make the swift class like this

import UIKit

import Foundation

@objc(MyTest2) class MyTest2: UIApplication

{

    

    

  

    

}

and modify the main.m

#import <UIKit/UIKit.h>

#import "AppDelegate.h"

#import "test3-swift.h"  //test3 is the project name, not a real file in project

int main(int argc, char * argv[]) {

    @autoreleasepool {

        return UIApplicationMain(argc, argv, NSStringFromClass([MyTest2 class]), NSStringFromClass([AppDelegate class]));

    }

}

Objective-c Getting device width programmatically

CGFloat width = [UIScreen mainScreen].bounds.size.width;

Swift: conditional unwrapping, checking error is nil or not

var error: NSError?

// now use error in functions like

audioSession.overrideOutputAudioPort(AVAudioSessionPortOverride.None, error: &error)

//and now conditional unwrapped

 if let routeChangeError = error {

            NSLog("error %@",routeChangeError)

  }

Swift: changing AVAudioSession route (voice from speaker to headphone and vice versa)

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "handleAVAudioSessionRouteChange:", name: AVAudioSessionRouteChangeNotification, object: nil)

@objc private func handleAVAudioSessionRouteChange(notification : NSNotification) {

        

        println("change route \(notification.userInfo)")

        let audioSession = AVAudioSession.sharedInstance()

        var error : NSError?

        let audioRouteChangeReason = notification.userInfo![AVAudioSessionRouteChangeReasonKey] as UInt

        

        switch audioRouteChangeReason {

        case AVAudioSessionRouteChangeReason.NewDeviceAvailable.rawValue:

            println("headphone plugged in")

        audioSession.overrideOutputAudioPort(AVAudioSessionPortOverride.None, error: &error)

        case AVAudioSessionRouteChangeReason.OldDeviceUnavailable.rawValue:

            println("headphone pulled out")

            audioSession.overrideOutputAudioPort(AVAudioSessionPortOverride.Speaker, error: &error)

        default:

            break

        }

    }

Swift NSUserDefault

setting  

NSUserDefaults.standardUserDefaults().setObject(myvalue, forKey: "mykey")

        NSUserDefaults.standardUserDefaults().synchronize()

reading

Swift

1 2 3 4 5

let defaults = NSUserDefaults.standardUserDefaults() if let name = defaults.stringForKey("myKey") {     println(name) }

stringForKey

IntegerForKey

ObjectForKey 

use based on requirements 

swift - Function with parameter and return value

• func sayHello(personName: String) -> String {
• let greeting = "Hello, " + personName + "!"
• return greeting
• }