錄像、錄音和拍照

現在我們使用的手機，無論是蘋果還是安卓，都能夠錄音、拍照和錄像，而且感覺這是在正常不過的了，不僅如此，現在的手機還能夠修音，修圖在這裏就不介紹了，這裏主要介紹如何實現錄音、拍照和錄像的功能。

一、錄音

錄音的介紹：使用的框架和音樂播放器一樣使用的AVFoundation

錄音使用到的類

（1）AVAudioRecord（輸入）

（2）相關的設置屬性

<1>AVNumberOfChannelsKey：通道數

<2>AVSampleRateKey：採樣率 44100

<3>AVLinearPCMBitDepthKey：比特率設置成16 32

<4>AVEncoderAudioQualityKey：質量

<5>AVEncoderBitRateKey：比特採樣率 128000

錄音的步驟

1、初始化了錄音對象

2、開始錄音

3、停止錄音

具體代碼

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface ViewController ()<AVAudioRecorderDelegate>

{

AVAudioRecorder *audionRecorder;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

button.frame = CGRectMake(100, 100, 100, 100);

[button setTitle:@"TICK" forState:UIControlStateNormal];

button.backgroundColor = [UIColor brownColor];

[button addTarget:self action:@selector(startAudioRecorder:) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];

}

- (void)startAudioRecorder:(UIButton *)sender{

sender.selected = !sender.selected;

if (sender.selected != YES) {

[audionRecorder stop];//停止錄音

}

// URL是本地的URL，audioRecorder

NSString *name = [NSString stringWithFormat:@"%d.aiff",(int)[NSDatedate].timeIntervalSince1970];

NSString *path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:name];

// 1、初始化錄音機

NSError *error;

audionRecorder = [[AVAudioRecorder alloc] initWithURL:[NSURL URLWithString:path] settings:@{AVNumberOfChannelsKey:@2,AVSampleRateKey:@44100,AVLinearPCMBitDepthKey:@32,AVEncoderAudioQualityKey:@(AVAudioQualityMax),AVEncoderBitRateKey:@128000} error:&error];

AVNumberOfChannelsKey：通道數，通常爲雙聲道值2

AVSampleRateKey：採樣率 HZ 通常設置爲44100 44.1KHZ

AVLinearPCMBitDepthKey:比特率，通常爲8 16 24 32

AVEncoderAudioQualityKey：聲音質量，參數是一個枚舉

AVAudioQualityMin = 0,最小的質量

AVAudioQualityLow = 0x20,比較低的質量

AVAudioQualityMedium = 0x40,中間的質量

AVAudioQualityHigh = 0x60,高的質量

AVAudioQualityMax = 0x7F最好的質量

AVEncoderBitRateKey：音頻編碼的比特率單位BPS（傳輸速率）128000bps

[audionRecorder prepareToRecord];//欲錄音

[audionRecorder record];//開始錄音

audionRecorder.delegate = self;

NSLog(@"%@",path);

}

//錄音結束的時候調用

- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{

// NSLog(@"錄音結束");

NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)lastObject];

// 文件操作的類

NSFileManager *fileManager = [NSFileManager defaultManager];

// 獲得當前文件的所有子文件subpathsAtPath：

NSArray *pathList = [fileManager subpathsAtPath:path];

// NSLog(@"%@",pathList);

// NSString *path1 = pathList[2];

// NSLog(@"%@",path1.pathExtension);

// 需要只獲得錄音文件

NSMutableArray *audioPathList = [NSMutableArray array];

// 遍歷所有這個文件夾下面的子文件

for (NSString *audioPath in pathList) {

// 通過文件的擴展名（尾綴）來區分是不是錄音文件

if ([audioPath.pathExtension isEqualToString:@"aiff"]) {

// 把篩選出來的文件放到數組，得到所有的音頻wenjian

[audioPathList addObject:audioPath];

}

NSLog(@"%@",audioPathList);

}

錄像和拍照的使用很相似，在這裏就將它們兩個一塊講了

錄像、拍照

錄像和拍照使用的框架是UIKit框架，使用的類是：UIImagePickerController

介紹一些屬性和方法

區分選擇攝像頭還是相冊：sourceType
 UIImagePickerControllerSourceTypePhotoLibrary,

 保存的相冊
 UIImagePickerControllerSourceTypeCamera,攝像頭
 UIImagePickerControllerSourceTypeSavedPhotosAlbum相冊

 區分錄像和拍照cameraCaptureMode
  拍照：UIImagePickerControllerCameraCaptureModePhoto
  錄像：UIImagePickerControllerCameraCaptureModeVideo

 設置視頻清晰度
 UIImagePickerControllerQualityTypeHigh高清
 UIImagePickerControllerQualityTypeMedium普通
 UIImagePickerControllerQualityTypeLow
 UIImagePickerControllerQualityType 640x480
 UIImagePickerControllerQualityTypeIFrame 1280x720
 UIImagePickerControllerQualityTypeIFrame 960x540

 設置視頻最大的持續時間
 videoMaximumDuration 默認最大十分鐘

 區分前後攝像頭：cameraDevice
 前置：UIImagePickerControllerCameraDeviceFront
 後置：UIImagePickerControllerCameraDeviceRear

 是否顯示控制控件：showsCameraControls

 默認YES顯示控制控件

 設置拍照：takePicture

 錄像：startVideoCapture
 停止：stopVideoCapture

 閃光模式：cameraFlashMode，默認自動
 UIImagePickerControllerCameraFlashModeOff  = -1,關閉
 UIImagePickerControllerCameraFlashModeAuto = 0,自動
 UIImagePickerControllerCameraFlashModeOn   = 1

 開啓

 設置調用攝像頭視圖頁面 覆蓋視圖
 cameraOverlayView

 設置拍照頁面的形態 camereViewTransform

 代理：需要導入兩個代理
 @property(nullable,nonatomic,weak)      id <UINavigationControllerDelegate, UIImagePickerControllerDelegate> delegate;

 代理方法：不區分錄像和拍照

採集完成之後調用 不區分拍照和錄像
 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info;

 採集取消的時候調用
 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;

具體代碼

#import "ViewController.h"

#import <AVKit/AVKit.h>

#import <AVFoundation/AVFoundation.h>

#import <MobileCoreServices/MobileCoreServices.h>

#define SCREEN_BOUNDS [UIScreen mainScreen].bounds//屏幕尺寸

#define SCREEN_WIDTH CGRectGetWidth([UIScreen mainScreen].bounds)//屏幕寬

#define SCREEN_HEIGHT CGRectGetHeight([UIScreen mainScreen].bounds)//屏幕高

@interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>
{

    UILabel *lable;//顯示拍照或者錄像的控件
    BOOL isMovie;//判斷攝像的依據

    UIImageView *imageView;//顯示拍照錄像結果的視圖
}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.frame = CGRectMake(100, 100, 100, 100);

    [button setTitle:@"Camera" forState:UIControlStateNormal];
    button.backgroundColor = [UIColor brownColor];

    [button addTarget:self action:@selector(doit) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];

    UISwitch *medioSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(SCREEN_WIDTH-100, 50, 50, 30)];

    [medioSwitch addTarget:self action:@selector(changeMedio:) forControlEvents:UIControlEventValueChanged];
    [self.view addSubview:medioSwitch];

    lable = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMinX(medioSwitch.frame), CGRectGetMinY(medioSwitch.frame)-30, 50, 50)];

    lable.textAlignment = NSTextAlignmentCenter;
    lable.textColor =
[UIColor purpleColor];
    lable.text = @"拍照";
    [self.view addSubview:lable];

    imageView = [[UIImageView alloc] initWithFrame:CGRectMake(100, 150, 200, 300)];
    [self.view addSubview:imageView];
}

- (void)changeMedio:(UISwitch *)sender{

    lable.text = sender.isOn != YES ? @"拍照":@"錄像";

    isMovie = sender.isOn;

}

- (void)doit{

    //    創建錄像、拍照對象

    UIImagePickerController *pickImageController = [[UIImagePickerController alloc] init];
    if (isMovie == YES)
{

 //    選擇攝像頭設備

//     默認選擇相冊

    pickImageController.sourceType = UIImagePickerControllerSourceTypeCamera;

//    設置選擇錄像

//    默認拍照 選擇cameraCaptureMode錄像，一定要選擇媒體的類型 不然會崩潰

//    選擇媒體的類型

//    拍照的時候不選擇媒體類型，不會崩潰，因爲默認設置是kUTTypeImage

//    kUTTypeImage包含在MobileCoreServices框架中

//    MobileCoreServices需要的內容不是OC中字符串的類型，需要強轉

//    mediaTypes錄製視頻，類型要選擇movie，因爲movie裏面包含了audio和video
    pickImageController.mediaTypes = @[(NSString *)kUTTypeMovie];

    pickImageController.cameraCaptureMode =  UIImagePickerControllerCameraCaptureModeVideo;

     }

//    delegate裏面包含兩個協議

//    UINavigationBarDelegate

//    UIImagePickerControllerDelegate
    pickImageController.delegate = self;

    [self presentViewController:pickImageController animated:YES completion:nil];

}

- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

    NSLog(@"完成");

    NSLog(@">>>>%@",info);

    if ([info [UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeMovie])
{
        NSLog(@"錄像。。。。。");

        NSLog(@"******%@",[info[UIImagePickerControllerMediaURL] path]);

//        將URL轉換成path
        NSString *path = (NSString *)[info[UIImagePickerControllerMediaURL] path];

//        UIImagePickerControllerMediaURL

//        保存視頻到URL
        UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
    }

    if ([info [UIImagePickerControllerMediaType ] isEqualToString:(NSString *)kUTTypeImage])
{
        NSLog(@"拍照了。。。。。");

//        UIImagePickerControllerOriginalImage

//        NSLog(@"%@",info [UIImagePickerControllerOriginalImage]);

        UIImage *finishImage = info[UIImagePickerControllerOriginalImage];

        imageView.image = nil;
        imageView.image =
finishImage;

//        .jpeg的圖片轉換成二進制
     NSData *imageData = UIImageJPEGRepresentation(finishImage, 0.1);

//        .png的圖片轉換成二進制
    NSData *imageData1 = UIImagePNGRepresentation(finishImage);

//        通過這個方法將圖片保存到相冊
        UIImageWriteToSavedPhotosAlbum(finishImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    }

 [self dismissViewControllerAnimated:YES completion:nil];
}

//視頻保存到相冊之後調用
- (void)video:(NSString *)videoPath
didFinishSavingWithError:(NSError *)error contextInfo:(void*)contextInfo{

    AVPlayer *player = [AVPlayer playerWithURL:[NSURL fileURLWithPath:videoPath]];

    AVPlayerViewController *palyerVC = [[AVPlayerViewController alloc] init];

//    [self.view addSubview:palyerVC.view];
    palyerVC.player = player;

    [self presentViewController:palyerVC animated:YES completion:nil];

    [palyerVC.player play];
}

//圖片保存到相冊之後調用
- (void)image:(UIImage *)image
didFinishSavingWithError:(NSError *)error contextInfo:(void*)contextInfo{

    NSLog(@"保存圖片成功");

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    NSLog(@"取消");

    [self dismissViewControllerAnimated:YES completion:nil];
}
- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

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

@end

錄像、錄音和拍照

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