一个可以录音录视频、视频预览播放、并删除视频音频的小demo~标题好长

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 <AVFoundation/AVFoundation.h>
#import <MobileCoreServices/MobileCoreServices.h>
#import "PreviousViewController.h"


@interface ViewController ()<AVAudioRecorderDelegate,AVAudioPlayerDelegate,UINavigationControllerDelegate,UIImagePickerControllerDelegate>{
    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 <UIKit/UIKit.h>

@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 <CoreMedia/CoreMedia.h>
#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>

@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