界面丑的掉渣，这是为了测试写的一个demo，主要解决了播放视频之后再播放音频不成功的问题

预览界面足够丑

播放界面更丑

因为录制完要跳转到视频播放页面，但是本页的viewController为空，跳不过去，所以要在AppDelegate.m里面稍作处理

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];    // Override point for customization after application launch.    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];//这里自己定义新的UINavigationController    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:self.viewController];    [self.window addSubview:nav.view];//    self.window.rootViewController = self.viewController;//这是原来的    [self.window makeKeyAndVisible];    return YES;}

 

然后倒入这些库MediaPlayer.framework，CoreMedia.framework，MobileCoreServices.framework，AudioToolbox.framework，AVFoundation.framework，CoreAudio.framework

ViewController.m

////  ViewController.m//  testRecord////  Created by changjian on 13-6-1.//  Copyright (c) 2013年 changjian. All rights reserved.//#import "ViewController.h"#import 
     
      #import 
      
       #import "PreviousViewController.h"@interface ViewController ()
       
        {    AVAudioRecorder *_audioRecorder;    AVAudioPlayer *_audioPlayer;    NSString *_mediaPath;}@property (retain, nonatomic) IBOutlet UIButton *recordVoice;@property (retain, nonatomic) IBOutlet UIButton *recordVideo;@property (retain, nonatomic) IBOutlet UIButton *playVoiceButton;@property (retain, nonatomic)NSString *voicePath;@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];}- (IBAction)tapRecordVoice:(id)sender {    UIButton *voiceButton = (UIButton *)sender;    voiceButton.selected = !voiceButton.isSelected;    if (voiceButton.isSelected) {        [_audioRecorder release];        _audioRecorder = nil; //下面两句是避免播视频之后不能正常播音频的，全文中一共有三处        AVAudioSession *session = [AVAudioSession sharedInstance];        [session setCategory:AVAudioSessionCategoryRecord error:nil];        /*******路径*******/        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];        [dateFormatter setDateFormat:@"yyyymmddhhmmss"];        NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];        NSString *fileName = [dateString stringByAppendingString:@".caf"];        NSString *filePath = ITTPathForCacheResource([NSString stringWithFormat:@"%@",fileName]);//        NSLog(@"lujing===%@",filePath);        self.voicePath = filePath;        /*****参数******/        NSMutableDictionary *recordSettings=[[NSMutableDictionary alloc]init];        NSNumber *formatObject;        formatObject = [NSNumber numberWithInt: kAudioFormatMPEG4AAC];        [recordSettings setObject:formatObject forKey: AVFormatIDKey];        [recordSettings setObject:[NSNumber numberWithFloat:44100.0] forKey: AVSampleRateKey];        [recordSettings setObject:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];        [recordSettings setObject:[NSNumber numberWithInt:12800] forKey:AVEncoderBitRateKey];        [recordSettings setObject:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];        [recordSettings setObject:[NSNumber numberWithInt: AVAudioQualityHigh] forKey: AVEncoderAudioQualityKey];        NSError *error = nil;        _audioRecorder = [[AVAudioRecorder alloc]initWithURL:[NSURL URLWithString:filePath] settings:recordSettings error:&error];        [recordSettings release];        _audioRecorder.delegate = self;        if ([_audioRecorder prepareToRecord] == YES) {            [_audioRecorder record];        }else {            int errorCode = CFSwapInt32HostToBig ([error code]);            NSLog(@"Error: %@ [%4.4s])" , [error localizedDescription], (char*)&errorCode);        }        [dateFormatter release];    }else{        [_audioRecorder stop];        AVAudioSession *session = [AVAudioSession sharedInstance];        [session setCategory:AVAudioSessionCategoryPlayback error:nil];    }}- (IBAction)tapPlayVoice:(id)sender {    UIButton *playeButton = (UIButton*)sender;    playeButton.selected = !playeButton.isSelected;    NSString *path = [NSString stringWithString:_voicePath];    if (playeButton.isSelected) {        AVAudioSession *session = [AVAudioSession sharedInstance];        [session setCategory:AVAudioSessionCategoryPlayback error:nil];        if(_audioPlayer){            [_audioPlayer release];            _audioPlayer = nil;        }        _audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:nil];        _audioPlayer.delegate = self;        if ([_audioPlayer prepareToPlay] == YES) {            [_audioPlayer play];        }    }else{        [_audioPlayer stop];    }}- (IBAction)clearRecordVoice:(id)sender {    NSFileManager * fm = [NSFileManager defaultManager];    [fm removeItemAtPath:self.voicePath error:nil];    NSLog(@"清除录音");        _playVoiceButton.hidden = YES;        _recordVoice.hidden = NO;}- (IBAction)clearVideo:(id)sender {    NSFileManager *fm = [NSFileManager defaultManager];    [fm removeItemAtPath:_mediaPath error:nil];    NSLog(@"清除视频");    _recordVideo.selected = NO;}#pragma mark - AVAudioRecorderDelegate- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{    NSLog(@"recorder successfully");      _recordVoice.hidden = YES;    _playVoiceButton.hidden = NO;}#pragma mark - AVAudioPlayerDelegate- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{    NSLog(@"播放录音完成");    _playVoiceButton.selected = NO;}- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer*)player error:(NSError *)error{    NSLog(@"出错了");}#pragma mark UIImagePickerControllerDelegate- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];    NSString *cacheDirectory = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];    [dateFormatter setDateFormat:@"yyyymmddhhmmss"];    NSString *dateString = [dateFormatter stringFromDate:[NSDate date]];    [dateFormatter release];    NSString *path = nil;    if ([mediaType isEqualToString:(NSString*)kUTTypeImage]) {        UIImage *editImage = [info objectForKey:UIImagePickerControllerOriginalImage];        NSData *imageData = UIImageJPEGRepresentation(editImage,0.1);//压缩图片系数        path = [dateString stringByAppendingString:@".jpg"];        [imageData writeToFile:[cacheDirectory stringByAppendingPathComponent:path] atomically:YES];    }else if ([mediaType isEqualToString:(NSString*)kUTTypeMovie]){        NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];        NSData *videoData = [NSData dataWithContentsOfURL:videoURL];        path = [dateString stringByAppendingString:@".mov"];        [videoData writeToFile:[cacheDirectory stringByAppendingPathComponent:path] atomically:YES];            }    NSLog(@"媒体地址%@",[cacheDirectory stringByAppendingPathComponent:path]);    _mediaPath = [[NSString stringWithString:[cacheDirectory stringByAppendingPathComponent:path]]retain];    [picker dismissViewControllerAnimated:YES completion:^{        _recordVideo.selected = YES;    }];}- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{    [picker dismissViewControllerAnimated:YES completion:^{            }];}- (IBAction)recordVideo:(id)sender {    UIButton *button = (UIButton*)sender;    if (button.isSelected == YES) {        PreviousViewController *previousViewController = [[PreviousViewController alloc]init];        previousViewController.mediaPath = _mediaPath;        [self.navigationController pushViewController:previousViewController animated:YES];        NSLog(@"self.navigationController==%@",self.navigationController);        [previousViewController release];    }else{    if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {        NSLog(@"相机不可用");        return;    }    UIImagePickerController *imagePickViewController = [[UIImagePickerController alloc]init];    imagePickViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;    imagePickViewController.sourceType = UIImagePickerControllerSourceTypeCamera;    imagePickViewController.cameraDevice = UIImagePickerControllerCameraDeviceRear;    NSArray *sourceType = [UIImagePickerController availableMediaTypesForSourceType:imagePickViewController.sourceType];    if ([sourceType containsObject:(NSString*)kUTTypeMovie]) {        imagePickViewController.mediaTypes = [NSArray arrayWithObjects:(NSString*)kUTTypeMovie,(NSString*)kUTTypeImage, nil];    }    imagePickViewController.allowsEditing = NO;    imagePickViewController.delegate = self;    [self presentViewController:imagePickViewController animated:YES completion:^{            }];    [imagePickViewController release];    }}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/** * 返回Cache资源路径 */NSString *ITTPathForCacheResource(NSString* relativePath){    static NSString* documentsPath = nil;    if (nil == documentsPath) {        NSArray* dirs = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);        documentsPath = [dirs[0] retain];    }    return [documentsPath stringByAppendingPathComponent:relativePath];}- (void)dealloc {    [_mediaPath release];    [_recordVoice release];    [_recordVideo release];    [_playVoiceButton release];    [super dealloc];}@end
       
      
     

播放视频类

PreviousViewController.h

////  PreviousViewController.h//  testRecord////  Created by changjian on 13-6-1.//  Copyright (c) 2013年 changjian. All rights reserved.//#import 
     
      @interface PreviousViewController : UIViewController@property(nonatomic,copy)NSString *mediaPath;@end
     

PreviousViewController.//// PreviousViewController.m

//  testRecord////  Created by changjian on 13-6-1.//  Copyright (c) 2013年 changjian. All rights reserved.//#import "PreviousViewController.h"#import 
     
      #import 
      
       #import 
       
        @interface PreviousViewController (){    MPMoviePlayerController *_moviePlayerController;//注意这个对象必须定义为全局的，不然播放时会出错！}@property (retain, nonatomic) IBOutlet UIButton *playButton;@property (retain, nonatomic) IBOutlet UIImageView *backImageView;@property (retain, nonatomic) IBOutlet UIView *backView;@end@implementation PreviousViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    if ([_mediaPath hasSuffix:@".jpg"]) {        NSLog(@"无视频");    }else if([_mediaPath hasSuffix:@".mov"]){    [NSThread detachNewThreadSelector:@selector(getGenerateThumbNailDataWithVideo:) toTarget:self withObject:_mediaPath];    }    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(playDidFinish) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];    // Do any additional setup after loading the view from its nib.}- (void)playDidFinish{    [UIView animateWithDuration:0.5 animations:^{        _playButton.alpha = 1.0;        _backImageView.alpha = 1.0;        if (_moviePlayerController) {//            [_moviePlayerController stop];            [_moviePlayerController.view removeFromSuperview];        }    }completion:^(BOOL finish){            }];    NSLog(@"播放完了");}//下面这个方法用来获得视频的截图-(void)getGenerateThumbNailDataWithVideo:(NSString*)path {    NSURL *url = [NSURL fileURLWithPath:path];     AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil];    AVAssetImageGenerator *generate = [[AVAssetImageGenerator alloc] initWithAsset:asset];    generate.appliesPreferredTrackTransform = YES;    NSError *err = NULL;    CMTime time = CMTimeMake(1, 60);    CGImageRef imgRef = [generate copyCGImageAtTime:time actualTime:NULL error:&err];    [generate release];    [asset release];    UIImage *currentImg = [[[UIImage alloc] initWithCGImage:imgRef]autorelease];    CGImageRelease(imgRef);    [self performSelectorOnMainThread:@selector(updateView:) withObject:currentImg waitUntilDone:YES];}- (void)updateView:(UIImage*)image{    [_backImageView setImage:image];}- (IBAction)tapPlayVideo:(id)sender withFilePath:(NSString *)path{    if(!_moviePlayerController){        _moviePlayerController = [[MPMoviePlayerController alloc]init];        _moviePlayerController.contentURL = [NSURL fileURLWithPath:_mediaPath];        _moviePlayerController.controlStyle = MPMovieControlStyleDefault;        _moviePlayerController.scalingMode =MPMovieScalingModeAspectFill;        _moviePlayerController.view.frame = CGRectMake(30, 20, 250, 350);        [_moviePlayerController play];    }    [self.view addSubview:_moviePlayerController.view];    [UIView animateWithDuration:0.5 animations:^{        _playButton.alpha = 0;        _backImageView.alpha = 0;    }completion:^(BOOL finish){            }];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (void)dealloc {    [[NSNotificationCenter defaultCenter]removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:nil];    if (_moviePlayerController) {                [_moviePlayerController stop];        [_moviePlayerController.view removeFromSuperview];    }    [_playButton release];    [_moviePlayerController release];    [_backImageView release];    [_backView release];    [super dealloc];}@end