IOS学习：AVAudioPlayer播放音乐文件及读取ipod库中的音乐文件(3)

来源：未知责任编辑：责任编辑发表时间:2015-03-01 01:30　点击:次

    timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updateSlider) userInfo:nil repeats:YES];

    // 从ipod库中读出音乐文件
//    MPMediaQuery *everything = [[MPMediaQuery alloc] init];
//    // 读取条件
//    MPMediaPropertyPredicate *albumNamePredicate =
//    [MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypeMusic ] forProperty: MPMediaItemPropertyMediaType];
//    [everything addFilterPredicate:albumNamePredicate];
//
//    NSLog(@"Logging items from a generic query...");
//    NSArray *itemsFromGenericQuery = [everything items];
//    for (MPMediaItem *song in itemsFromGenericQuery) {
//        NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];
//        NSLog (@"%@", songTitle);
//    }
//
//    [everything release];
}

// 更新播放进度
- (void)updateSlider {
    slider.value = player.currentTime;
}

// 进度滑块变化时，跳转到进度播放
- (void)sliderValueChange:(UISlider *)mSlider {
    player.currentTime = mSlider.value;
    NSLog(@"value: %.0f", mSlider.value);
}

// 停止
- (void)stop {
    player.currentTime = 0;
    [player stop];
}

// 暂停
- (void)pause {
    [player pause];
    NSLog(@"pause");
}

// 开始播放
- (void)playMusic {
    NSLog(@"start play");
    [player play];
}

#pragma mark - AVAudioPlayerDelegate
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
    // 播放完成时调用   只有当播放结束时才会调用，循环播放时不会调
    [timer invalidate];
    NSLog(@"audioPlayerDidFinishPlaying");
}

/* if an error occurs while decoding it will be reported to the delegate. */
- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error {