iOS开发之录像拍照

一、属性

录像和拍照用到的都是UIImagePickerController这个类，但是使用的时候怎么区分它们呢？下面就先说一下它们的一些基本属性：

1. 区分拍照或是录像：cameraCaptureMode：

拍照：UIImagePickerControllerCameraCaptureModePhoto,
录像：UIImagePickerControllerCameraCaptureModeVideo
默认的是拍照

2.区分是使用摄像头或是相册：sourceType

图库：UIImagePickerControllerSourceTypePhotoLibrary,
相机：UIImagePickerControllerSourceTypeCamera,
相册：UIImagePickerControllerSourceTypeSavedPhotosAlbum

3.区分前置摄像头 后置摄像头：cameraDevice

后摄像头：UIImagePickerControllerCameraDeviceRear,
前摄像头：UIImagePickerControllerCameraDeviceFront

4. 设置是否显示控制控件：showsCameraControls默认的是显示控制控件

5.设置拍照：takePicture

6.录像：

开始：startVideoCapture
结束：stopVideoCapture

7.设置视频清晰度:videoQuality

UIImagePickerControllerQualityTypeHigh
UIImagePickerControllerQualityTypeMedium
UIImagePickerControllerQualityTypeLow
UIImagePickerControllerQualityType640x480
UIImagePickerControllerQualityTypeIFrame1280x720
UIImagePickerControllerQualityTypeIFrame960x540

8.设置视频最大的录像时间：videoMaximumDuration 默认是10分钟

9. 闪光模式：cameraFlashMode：

UIImagePickerControllerCameraFlashModeOff 关闭的
UIImagePickerControllerCameraFlashModeAuto =0，自动的默认的是自动的
UIImagePickerControllerCameraFlashModeOn 开启的

10.设置调用摄像头视图页面的 覆盖视图：cameraOverlayView

11.设置拍照页面的形态：cameraViewTransform

二、代理

代理delegate：需要导入两个代理：
UINavigationControllerDelegate、
UIImagePickerControllerDelegate
@property(nullable,nonatomic,weak) id <UINavigationControllerDelegate, UIImagePickerControllerDelegate> delegate;

采集完成之后调用 不区分拍照摄像

• (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info;
  采集取消的时候调用
• (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;

三、代码示例

废话不多说了，上代码（使用的时候请用真机测试，因为模拟器是不支持摄像头的功能的）：

#import "ViewController.h"
#import <MobileCoreServices/MobileCoreServices.h>//这个框架是选择媒体类型时需要用到的
#import "UIView Transfrom.h"//这个是自己封装的一个简单的动画类，这里没有附上代码可以将它屏蔽，showTypeLabel的时候用到的
#import <AVKit/AVKit.h>
#import <AVFoundation/AVFoundation.h>
#define SCREEN_BOUNDS [UIScreen mainScreen].bounds//屏幕尺寸
#define SCREEN_WIDTH CGRectGetWidth([UIScreen mainScreen].bounds)//屏幕宽
#define SCREEN_HEIGHT CGRectGetHeight([UIScreen mainScreen].bounds)//屏幕高
@interface ViewController ()< UINavigationControllerDelegate, UIImagePickerControllerDelegate>{
    BOOL isMovie;//判断拍照摄像的依据
    UILabel *showTypeLabel;//显示拍照或是录像的控件
    UIImageView *showMediaView;//显示拍照录像结果的视图
    
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UISwitch *mediaSwich = [[UISwitch alloc]initWithFrame:CGRectMake(SCREEN_WIDTH - 100, 60, 50, 50)];
    [mediaSwich addTarget:self action:@selector(changeMediaType:) forControlEvents:UIControlEventValueChanged];
    
    [self.view addSubview:mediaSwich];
    showTypeLabel = [[UILabel alloc]initWithFrame:CGRectMake(CGRectGetMinX(mediaSwich.frame), CGRectGetMinY(mediaSwich.frame)+50, 50, 30)];
    showTypeLabel.textAlignment = NSTextAlignmentCenter;
    showTypeLabel.textColor = [UIColor colorWithRed:0.8963 green:0.3301 blue:1.0 alpha:1.0];
    showTypeLabel.text = @"拍照";
    [self.view addSubview:showTypeLabel];
    
    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];
    showMediaView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 200, 200, 200)];
    showMediaView.contentMode = UIViewContentModeScaleAspectFill;
    
    [self.view addSubview:showMediaView];
    
    
}
-(void)changeMediaType:(UISwitch *)sender{
    [showTypeLabel rotation];
    
    showTypeLabel.text = sender.isOn!=YES?@"拍照":@"录像" ;
    isMovie = sender.isOn;
    
}
-(void)doit{
    
    UIImagePickerController *pickerController = [[UIImagePickerController alloc]init];
    //选择摄像头设备 默认的是选择相册
    pickerController.sourceType =  UIImagePickerControllerSourceTypeCamera;
    if (isMovie == YES) {
        //拍照的时候不选择mediaTypes不会崩溃是因为默认设置是kUTTypeImage
        //kUTTypeImage包含在MobileCoreServices框架里面->需要的内容不是OC里面字符串的类型需要强制转换
        //录制视频类型要选择kUTTypeMovie 它里面包含了audio和video
        pickerController.mediaTypes = @[(NSString *)kUTTypeMovie];
        //设置录像 默认的是拍照 -> 选择cameraCaptureMode一定要先选择mediaTypes否则会崩溃
        pickerController.cameraCaptureMode =  UIImagePickerControllerCameraCaptureModeVideo;
        
    }
    //里面包含两个代理
    pickerController.delegate = self;
    
    [self presentViewController:pickerController animated:YES completion:nil];
    
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    NSLog(@"录制完成");
    NSLog(@">>:%@",info);
    if ([info[UIImagePickerControllerMediaType]isEqualToString:(NSString *)kUTTypeMovie]) {
        NSLog(@"录像，录制完成");
        NSString *path = (NSString *)[info[UIImagePickerControllerMediaURL] path];
        //保存视频到相册
        UISaveVideoAtPathToSavedPhotosAlbum(path, self, @selector(video:didFinishSavingWithError:contextInfo:), nil) ;
        
    }
    if ([info[UIImagePickerControllerMediaType]isEqualToString:(NSString *)kUTTypeImage]) {
        NSLog(@"拍照，拍照完成");
        UIImage *finishImage = info[UIImagePickerControllerOriginalImage];
        showMediaView.image = nil;
        showMediaView.image = finishImage;
        //将图片转换成二进制
        NSData *imageData = UIImageJPEGRepresentation(finishImage, 0.1);
        NSData *imageData1 = UIImagePNGRepresentation(finishImage);
        //把照片保存到相册
        UIImageWriteToSavedPhotosAlbum(finishImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
        
    }
    [self dismissViewControllerAnimated:YES completion:nil];
}
//视频保存到相册之后调用
- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    AVPlayer *player = [AVPlayer playerWithURL:[NSURL fileURLWithPath:videoPath]];
    AVPlayerViewController *vc = [[AVPlayerViewController alloc]init];
    vc.player = player;
    [self presentViewController:vc animated:YES completion:nil];
    
}
//保存成功就会调用这个方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    NSLog(@"保存成功");
    
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
    NSLog(@"取消");
    [self dismissViewControllerAnimated:YES completion:nil];
}

@end