IOS调取系统摄像头

1、打开摄像头- (IBAction)Open:(id)sender {    UIImagePickerController *picker = [[UIImagePickerController alloc] init];    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {        picker.sourceType = UIImagePickerControllerSourceTypeCamera;        NSArray *temp_MediaTypes = [UIImagePickerController availableMediaTypesForSourceType:picker.sourceType];        picker.mediaTypes = temp_MediaTypes;        picker.delegate = self;        picker.allowsImageEditing = YES;     }    [self presentModalViewController:picker animated:YES];    [picker release];}2.拍照回调- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{     NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];     BOOL success;    NSFileManager *fileManager = [NSFileManager defaultManager];    NSError *error;        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *documentsDirectory = [paths objectAtIndex:0];        if ([mediaType isEqualToString:@"public.image"]){                UIImage *image = [info objectForKey:@"UIImagePickerControllerEditedImage"];        NSLog(@"found an image");       NSString *imageFile = [documentsDirectory stringByAppendingPathComponent:@"temp.jpg"];        NSLog(@"%@", imageFile);        success = [fileManager fileExistsAtPath:imageFile];        if(success) {            success = [fileManager removeItemAtPath:imageFile error:&error];        }                imageView.image = image;        [UIImageJPEGRepresentation(image, 1.0f) writeToFile:imageFile atomically:YES];         //SETIMAGE(image);        //CFShow([[NSFileManager defaultManager] directoryContentsAtPath:[NSHomeDirectory() stringByAppendingString:@"/Documents"]]);    }    else if([mediaType isEqualToString:@"public.movie"]){        NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];        NSLog(@"%@", videoURL);        NSLog(@"found a video");        NSData *videoData = [NSData dataWithContentsOfURL:videoURL];                /****************************************/                NSString *videoFile = [documentsDirectory stringByAppendingPathComponent:@"temp.mov"];        NSLog(@"%@", videoFile);                success = [fileManager fileExistsAtPath:videoFile];        if(success) {            success = [fileManager removeItemAtPath:videoFile error:&error];        }        [videoData writeToFile:videoFile atomically:YES];        //CFShow([[NSFileManager defaultManager] directoryContentsAtPath:[NSHomeDirectory() stringByAppendingString:@"/Documents"]]);        //NSLog(videoURL);    }    [picker dismissModalViewControllerAnimated:YES];}- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {       [picker dismissModalViewControllerAnimated:YES];}