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1. Background playback is done by adding Info.plist to UIBackgroundModes in audio for reference https://developer.apple.com/library/i...

2. "Even after double-clicking the home button, the music control bar on the left turns into the icon of Douban Radio." This is to register an object in your own program as a responder to the corresponding remote control message. When the user clicks prev, next, play/pause in the control bar, the program will receive the corresponding message. When receiving the message, you must control the playback accordingly.
Register the responder in the view controller:

- (void) viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
}

- (void) viewWillDisappear:(BOOL)animated {
    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
    [self resignFirstResponder]; 
    [super viewWillDisappear:animated];
}

- (BOOL) canBecomeFirstResponder {
    return YES;
}

At the same time, the view controller needs to implement:

- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent;

3. Making the control bar display a title is another matter. You need to call the media center interface in the program to set the title and cover. Referencehttp://stackoverflow.com/questions/10...

4. Getting the album cover and title from ID3 is the fourth thing. .