要给工程中添加音频,首先要导入音频的框架 AVFoundation.framework
然后新建一个类继承于UIViewController, 我这里就叫FirstVC.
首先在 AppDelegate.m中初始化根视图
#import "AppDelegate.h" #import "FirstVC.h" @implementation AppDelegate- (void)dealloc { [_window release]; [super dealloc]; }
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease]; // Override point for customization after application launch. FirstVC *firstVC = [[FirstVC alloc] init]; self.window.rootViewController = firstVC; [firstVC release]; self.window.backgroundColor = [UIColor whiteColor]; [self.window makeKeyAndVisible]; return YES; }
#import <UIKit/UIKit.h>
//要想使用封装好的音频类,导入框,导入类头文件,缺一不可; #import <AVFoundation/AVFoundation.h>
@interface FirstVC : UIViewController<AVAudioPlayerDelegate> { AVAudioPlayer *avAudioPlayer; //播放器player UIProgressView *progressV; //播放进度 UISlider *volumeSlider; //声音控制 NSTimer *timer; //监控音频播放进度 }
@end
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. //初始化三个button UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button setFrame:CGRectMake(100, 100, 60, 40)]; [button setTitle:@"Play" forState:UIControlStateNormal]; [button addTarget:self action:@selector(play) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button]; UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button1 setFrame:CGRectMake(100, 150, 60, 40)]; [button1 setTitle:@"pause" forState:UIControlStateNormal]; [button1 addTarget:self action:@selector(pause) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button1]; UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect]; [button2 setFrame:CGRectMake(100, 200, 60, 40)]; [button2 setTitle:@"stop" forState:UIControlStateNormal]; [button2 addTarget:self action:@selector(stop) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button2]; //从budle路径下读取音频文件 轻音乐 - 萨克斯回家 这个文件名是你的歌曲名字,mp3是你的音频格式 NSString *string = [[NSBundle mainBundle] pathForResource:@"轻音乐 - 萨克斯回家" ofType:@"mp3"]; //把音频文件转换成url格式 NSURL *url = [NSURL fileURLWithPath:string]; //初始化音频类 并且添加播放文件 avAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil]; //设置代理 avAudioPlayer.delegate = self; //设置初始音量大小 // avAudioPlayer.volume = 1; //设置音乐播放次数 -1为一直循环 avAudioPlayer.numberOfLoops = -1; //预播放 [avAudioPlayer prepareToPlay]; //初始化一个播放进度条 progressV = [[UIProgressView alloc] initWithFrame:CGRectMake(20, 50, 200, 20)]; [self.view addSubview:progressV]; [progressV release]; //用NSTimer来监控音频播放进度 timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(playProgress) userInfo:nil repeats:YES]; //初始化音量控制 volumeSlider = [[UISlider alloc] initWithFrame:CGRectMake(20, 70, 200, 20)]; [volumeSlider addTarget:self action:@selector(volumeChange) forControlEvents:UIControlEventValueChanged]; //设置最小音量 volumeSlider.minimumValue = 0.0f; //设置最大音量 volumeSlider.maximumValue = 10.0f; //初始化音量为多少 volumeSlider.value = 5.0f; [self.view addSubview:volumeSlider]; [volumeSlider release];//声音开关控件(静音) UISwitch *swith = [[UISwitch alloc] initWithFrame:CGRectMake(100, 20, 60, 40)]; [swith addTarget:self action:@selector(onOrOff:) forControlEvents:UIControlEventValueChanged]; //默认状态为打开 swith.on = YES; [self.view addSubview:swith]; [swith release]; }
//播放 - (void)play { [avAudioPlayer play]; } //暂停 - (void)pause { [avAudioPlayer pause]; } //停止 - (void)stop { avAudioPlayer.currentTime = 0; //当前播放时间设置为0 [avAudioPlayer stop]; } //播放进度条 - (void)playProgress { //通过音频播放时长的百分比,给progressview进行赋值; progressV.progress = avAudioPlayer.currentTime/avAudioPlayer.duration; } //声音开关(是否静音) - (void)onOrOff:(UISwitch *)sender { avAudioPlayer.volume = sender.on; }//播放音量控制 - (void)volumeChange { avAudioPlayer.volume = volumeSlider.value; }
//播放完成时调用的方法 (代理里的方法),需要设置代理才可以调用 - (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag { [timer invalidate]; //NSTimer暂停 invalidate 使...无效; }
- (void)dealloc { [avAudioPlayer release]; [progressV release]; [volumeSlider release]; [timer release]; [super dealloc]; }
最后运行起来的就是这个样子
如果想要播放网络音乐,那么遗憾的是iOS中的AVAudioPlayer不支持边下边播,所以只能下载到本地再播放。
方法:
NSString *urlStr = @"http://…………xxx.mp3"; NSURL *url = [[NSURL alloc]initWithString:urlStr]; NSData * audioData = [NSData dataWithContentsOfURL:url]; //将数据保存到本地指定位置 NSString *docDirPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString *filePath = [NSString stringWithFormat:@"%@/%@.mp3", docDirPath , @"temp"]; [audioData writeToFile:filePath atomically:YES]; //播放本地音乐 NSURL *fileURL = [NSURL fileURLWithPath:filePath]; player = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:nil]; [player play];
总结:
下面说一下我遇到的各种问题:
1、由于添加了All Exception断点,导致每次都在初始化的时候自动断到,因为不是OC异常,又无异常信息显示。这时应该编辑断点,将其类型由All改为OC。这个异常并不会导致程序的崩溃,所以可以不作处理。
2、网上有的说不能播放,解决方案是应该在 AppDelegate.m文件中的
application didFinishLaunchingWithOptions 添加这样一句代码:
[[AVAudioSession sharedInstance]setCategory:AVAudioSessionCategoryPlaybackerror:nil];
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