在我的应用程序中，我使用iPod播放器播放背景音乐（音乐应用程序）和AvAudioPlayer播放来自URL的歌曲 . 我想在这些播放器之间切换时为歌曲添加淡化效果 . 我尝试通过减少一个玩家的音量并增加另一个玩家的方式，但它没有给我褪色效果 . 谁能帮助我如何实现这一目标？提前致谢
这是我的代码
- (IBAction)play:(id)sender
{
timerCount = 0;
playAndPauseTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(playTimer) userInfo:nil repeats:YES];
}
-(void)playTimer
{
MPMusicPlayerController *musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
if(timerCount < 10) {
timerCount++;
float volume = musicPlayer.volume;
if(volume>0) {
volume = musicPlayer.volume-0.02f;
[musicPlayer setVolume:volume];
}
} else {
[playAndPauseTimer invalidate];
[musicPlayer setVolume:initialVolume];
[audioplayer play];
pauseButton.hidden = NO;
startButton.hidden = YES;
}
}
- (IBAction)pause:(id)sender
{
//[self pauseTimer];
timerCount=0;
playAndPauseTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(pauseTimer) userInfo:nil repeats:YES];
}
-(void)pauseTimer
{
MPMusicPlayerController *musicPlayer = [MPMusicPlayerController iPodMusicPlayer];
if(timerCount < 10) {
timerCount++;
float volume = musicPlayer.volume;
if(volume > 0){
volume = musicPlayer.volume-0.02f;
[musicPlayer setVolume:volume];
}
} else {
[playAndPauseTimer invalidate];
[audioplayer pause];
[musicPlayer setVolume:initialVolume];
pauseButton.hidden = YES;
startButton.hidden = NO;
}
}