AVAudioPlayer播放音乐文件及读取ipod库中的音乐文件

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

首先要导入AVFoundation框架及

下面是代码，代码中都有注释：

[cpp] view plaincopy

1. //

2. // RootViewController.h

3. // SoundDemo

4. //

5. // Created by on 13-6-21.

6. // Copyright (c) 2013年 DoubleMan. All rights reserved.

7. //

8. #import

9. #import

10. #import

11. @interface RootViewController : UIViewController

12. {

13. AVAudioPlayer *player;

14. }

15. @property (nonatomic, retain) AVAudioPlayer *player;

16. @property (nonatomic, retain) UISlider *slider;

17. @property (nonatomic, retain) NSTimer *timer;

18. @end

[cpp] view plaincopy

1. //

2. // RootViewController.m

3. // SoundDemo

4. //

5. // Created by on 13-6-21.

6. // Copyright (c) 2013年 DoubleMan. All rights reserved.

7. //

8. #import "RootViewController.h"

9. @interface RootViewController ()

10. @end

11. @implementation RootViewController

12. @synthesize player;

13. @synthesize slider;

14. @synthesize timer;

15. - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

16. {

17. self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

18. if (self) {

19. // Custom initialization

20. }

21. return self;

22. }

23. - (void)viewDidLoad

24. {

25. [super viewDidLoad];

26. UIButton *musicPlay = [UIButton buttonWithType:UIButtonTypeRoundedRect];

27. musicPlay.frame = CGRectMake(10, 10, 90, 35);

28. [musicPlay setTitle:@"Play" forState:UIControlStateNormal];

29. [musicPlay addTarget:self action:@selector(playMusic) forControlEvents:UIControlEventTouchUpInside];

30. [self.view addSubview:musicPlay];

31. UIButton *pause = [UIButton buttonWithType:UIButtonTypeRoundedRect];

32. pause.frame = CGRectMake(115, 10, 90, 35);

33. [pause setTitle:@"Pause" forState:UIControlStateNormal];

34. [pause addTarget:self action:@selector(pause) forControlEvents:UIControlEventTouchUpInside];

35. [self.view addSubview:pause];

36. UIButton *stop = [UIButton buttonWithType:UIButtonTypeRoundedRect];

37. stop.frame = CGRectMake(220, 10, 90, 35);

38. [stop setTitle:@"stop" forState:UIControlStateNormal];

39. [stop addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside];

40. [self.view addSubview:stop];

41. slider = [[UISlider alloc] initWithFrame:CGRectMake(10, 65, 300, 20)];

42. [slider addTarget:self action:@selector(sliderValueChange:) forControlEvents:UIControlEventValueChanged];

43. [self.view addSubview:slider];

44. //

45. NSString *path = [[NSBundle mainBundle] pathForResource:@"找一个相爱的理由-晨熙-艾歌" ofType:@"wav"];

46. NSURL *url = [NSURL fileURLWithPath:path];

47. player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];

48. // 设置循环次数，-1为一直循环

49. player.numberOfLoops = -1;

50. // 准备播放

51. [player prepareToPlay];

52. // 设置播放音量

53. player.volume = 50;

54. // 当前播放位置，即从currentTime处开始播放，相关于android里面的seekTo方法

55. player.currentTime = 15;

56. // 设置代理

57. player.delegate = self;

58. int dur = player.duration;

59. slider.maximumValue = dur;

60. // 一秒一次更新播放进度

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

62. // 从ipod库中读出音乐文件

63. // MPMediaQuery *everything = [[MPMediaQuery alloc] init];

64. // // 读取条件

65. // MPMediaPropertyPredicate *albumNamePredicate =

66. // [MPMediaPropertyPredicate predicateWithValue:[NSNumber numberWithInt:MPMediaTypeMusic ] forProperty: MPMediaItemPropertyMediaType];

67. // [everything addFilterPredicate:albumNamePredicate];

68. //

69. // NSLog(@"Logging items from a generic query...");

70. // NSArray *itemsFromGenericQuery = [everything items];

71. // for (MPMediaItem *song in itemsFromGenericQuery) {

72. // NSString *songTitle = [song valueForProperty: MPMediaItemPropertyTitle];

73. // NSLog (@"%@", songTitle);

74. // }

75. //

76. // [everything release];

77. }

78. // 更新播放进度

79. - (void)updateSlider {

80. slider.value = player.currentTime;

81. }

82. // 进度滑块变化时，跳转到进度播放

83. - (void)sliderValueChange:(UISlider *)mSlider {

84. player.currentTime = mSlider.value;

85. NSLog(@"value: %.0f", mSlider.value);

86. }

87. // 停止

88. - (void)stop {

89. player.currentTime = 0;

90. [player stop];

91. }

92. // 暂停

93. - (void)pause {

94. [player pause];

95. NSLog(@"pause");

96. }

97. // 开始播放

98. - (void)playMusic {

99. NSLog(@"start play");

100. [player play];

101. }

102. #pragma mark - AVAudioPlayerDelegate

103. - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {

104. // 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

105. [timer invalidate];

106. NSLog(@"audioPlayerDidFinishPlaying");

107. }

108. /* if an error occurs while decoding it will be reported to the delegate. */

109. - (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error {

110. // 解码出错时调用

111. }

112. - (void)didReceiveMemoryWarning

113. {

114. [super didReceiveMemoryWarning];

115. // Dispose of any resources that can be recreated.

116. }

117. - (void)dealloc

118. {

119. [player stop];

120. [player release];

121. [slider release];

122. [timer release];

123. [super dealloc];

124. }

125. @end

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