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];
}