Play background music on iOS

MainViewController.m

#import "MainViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface MainViewController ()

@property (strong, nonatomic) AVAudioPlayer *player;

@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"bgm" ofType:@"mp3"]] error:nil];    
    self.player.numberOfLoops = -1;
    [self.player prepareToPlay];
    [self.player play];
}