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iOS打开摄像头录像调用系统的UI界面,也可以自定义UI界面

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1.调用系统的UI界面

要用UIImagePickerController来拍照或者录制视频通常可以分为如下步骤：

1. 创建UIImagePickerController对象。2. 指定拾取源，平时选择照片时使用的拾取源是照片库或者相簿，此刻需要指定为摄像头类型。3. 指定摄像头，前置摄像头或者后置摄像头。4. 设置媒体类型mediaType，注意如果是录像必须设置，如果是拍照此步骤可以省略，因为mediaType默认包含kUTTypeImage（注意媒体类型定义在MobileCoreServices.framework中）5. 指定捕获模式，拍照或者录制视频。（视频录制时必须先设置媒体类型再设置捕获模式）6. 展示UIImagePickerController(通常以模态窗口形式打开）。7. 拍照和录制视频结束后在代理方法中展示/保存照片或视频。

MyViewController.h

#import "GetFilePath.h"@interface MyViewController () 
   
    @end@implementation MyViewController//触发事件：拍照- (void)addCamera{    UIImagePickerController *picker = [[UIImagePickerController alloc] init];    picker.delegate = self;    picker.allowsEditing = YES; //可编辑    //判断是否可以打开照相机    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {        //摄像头        //UIImagePickerControllerSourceTypeSavedPhotosAlbum:相机胶卷        picker.sourceType = UIImagePickerControllerSourceTypeCamera;    } else { //否则打开照片库        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;    }    [self presentViewController:picker animated:YES completion:nil];}//触发事件：录像- (void)addVideo{    UIImagePickerController *picker = [[UIImagePickerController alloc] init];    picker.delegate = self;    picker.allowsEditing = YES;    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {        picker.sourceType = UIImagePickerControllerSourceTypeCamera;        picker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];        picker.videoQuality = UIImagePickerControllerQualityTypeMedium; //录像质量        picker.videoMaximumDuration = 600.0f; //录像最长时间        picker.mediaTypes = [NSArray arrayWithObjects:@"public.movie", nil];    } else {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"当前设备不支持录像功能" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];        [alert show];    }    //跳转到拍摄页面    [self presentViewController:picker animated:YES completion:nil];}#pragma mark - UIImagePickerControllerDelegate //拍摄完成后要执行的代理方法- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];    BOOL success;    NSFileManager *fileManager = [NSFileManager defaultManager];    if ([mediaType isEqualToString:@"public.image"]) {        //得到照片        UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];        if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {            //图片存入相册            UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);        }        NSString *imagePath = [GetFilePath getSavePathWithFileSuffix:@"png"];        success = [fileManager fileExistsAtPath:imagePath];        if (success) {            [fileManager removeItemAtPath:imagePath error:nil];        }        NSData *imageData = UIImagePNGRepresentation(image);        [imageData writeToFile:imagePath atomically:YES]; //写入本地        success = [fileManager fileExistsAtPath:imagePath];        if (success) {             NSLog(@"图片写入成功,image路径:%@",imagePath);        }    } else if ([mediaType isEqualToString:@"public.movie"]) {        NSString *videoPath = [GetFilePath getSavePathWithFileSuffix:@"mov"];        success = [fileManager fileExistsAtPath:videoPath];        if (success) {            [fileManager removeItemAtPath:videoPath error:nil];        }        NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];        NSData *videlData = [NSData dataWithContentsOfURL:videoURL];        [videlData writeToFile:videoPath atomically:YES]; //写入本地        //存储数据        success = [fileManager fileExistsAtPath:videoPath];        if (success) {            NSLog(@"media 写入成功,video路径:%@",videoPath);        }    }    [self dismissViewControllerAnimated:YES completion:nil];}//进入拍摄页面点击取消按钮- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{    [self dismissViewControllerAnimated:YES completion:nil];}
   

GetFilePath.h

#import 
   
    @interface GetFilePath : NSObject//获取要保存的本地文件路径+ (NSString *)getSavePathWithFileSuffix:(NSString *)suffix;//获取录像的缩略图+ (UIImage *)getVideoThumbnailWithFilePath:(NSString *)filePath;+ (UIImage *)getImage:(NSString *)filePath;@end
   

.m

#import "GetFilePath.h"#import 
   
    #import 
    
     @implementation GetFilePath+ (NSString *)getSavePathWithFileSuffix:(NSString *)suffix{    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentPath = [paths objectAtIndex:0];    NSDate *date = [NSDate date];    //获取当前时间    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];    [dateFormat setDateFormat:@"yyyyMMddHHmmss"];    NSString *curretDateAndTime = [dateFormat stringFromDate:date];    //获取用户userID    NSDictionary *userDic= [[NSUserDefaults standardUserDefaults] objectForKey:UserInformation];    //命名文件    NSString *fileName = [NSString stringWithFormat:@"%@%@.%@",userDic[@"UserID"],curretDateAndTime,suffix];    //指定文件存储路径    NSString *filePath = [documentPath stringByAppendingPathComponent:fileName];    return filePath;}+ (UIImage *)getVideoThumbnailWithFilePath:(NSString *)filePath{    MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:filePath]];    moviePlayer.shouldAutoplay = NO;    UIImage *image = [moviePlayer thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame];    return image;}+ (UIImage *)getImage:(NSString *)filePath{    NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:AVURLAssetPreferPreciseDurationAndTimingKey];    NSURL *url = [NSURL fileURLWithPath:filePath];    AVURLAsset *urlAsset = [[AVURLAsset alloc] initWithURL:url options:options];    AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlAsset];    generator.appliesPreferredTrackTransform = YES;    generator.maximumSize = CGSizeMake(60, 60);    CGImageRef imageRef = [generator copyCGImageAtTime:CMTimeMake(10, 10) actualTime:NULL error:nil];    UIImage *image = [UIImage imageWithCGImage:imageRef];    return image;}
    
   

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