iOS Development - Calling the system camera and album to get photo examples

#import ""

@interface HeaderPhotoViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (nonatomic, strong) UIImageView * imageView;
@end

@implementation HeaderPhotoViewController

- (void)viewDidLoad {
  [super viewDidLoad];
   = @"Set avatar";
   = [UIColor whiteColor];

  [self setNavigation];
  [self addSubviews];
  [self makeConstraintsForUI];
}

#pragma mark - set navigation

- (void)setNavigation {

   = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(selectPhoto:)];
}

#pragma mark - navitation item action

- (void)selectPhoto:(UIBarButtonItem *)itemCamera {

  //Create UIImagePickerController object and set proxy and editable  UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
   = YES;
   = self;
   = YES;

  //Create a sheet prompt box to select a camera or album  UIAlertController * alert = [UIAlertController alertControllerWithTitle:@"Please select the opening method" message:nil preferredStyle:UIAlertControllerStyleActionSheet];

  //Camera Options  UIAlertAction * camera = [UIAlertAction actionWithTitle:@"camera" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

    // When selecting the camera, set the relevant properties of the UIImagePickerController object     = UIImagePickerControllerSourceTypeCamera;
     = UIModalPresentationFullScreen;
     = @[(NSString *)kUTTypeImage];
     = UIImagePickerControllerCameraCaptureModePhoto;
    //Skip to UIImagePickerController controller pops up the camera    [self presentViewController:imagePicker animated:YES completion:nil];
  }];

  //Album Options  UIAlertAction * photo = [UIAlertAction actionWithTitle:@"Photo Album" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

    // When selecting an album, set the relevant properties of the UIImagePickerController object     = UIImagePickerControllerSourceTypePhotoLibrary;
    //Skip to UIImagePickerController controller pop-up album    [self presentViewController:imagePicker animated:YES completion:nil];
  }];

  //Cancel button  UIAlertAction * cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

    [self dismissViewControllerAnimated:YES completion:nil];
  }];

  //Add various button events  [alert addAction:camera];
  [alert addAction:photo];
  [alert addAction:cancel];

  //The sheet prompt box pops up  [self presentViewController:alert animated:YES completion:nil];
}

#pragma mark - add subviews

- (void)addSubviews {

  [ addSubview:];
}

#pragma mark - make constraints

- (void)makeConstraintsForUI {

  __weak typeof(self)weakSelf = self;

  [_imageView mas_makeConstraints:^(MASConstraintMaker *make) {

    .mas_equalTo(CGSizeMake(Screen_Width, Screen_Width));
    .mas_equalTo(.mas_centerX);
    .mas_equalTo(.mas_centerY);
  }];
}

#pragma mark - imagePickerController delegate

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

  [picker dismissViewControllerAnimated:YES completion:nil];
  //The obtained pictures  UIImage * image = [info valueForKey:UIImagePickerControllerEditedImage];
  _imageView.image = image;
}

#pragma mark - setter and getter

- (UIImageView *)imageView {

  if (!_imageView) {

    _imageView = [[UIImageView alloc] init];
    _imageView.backgroundColor = [UIColor greenColor];
    _imageView.contentMode = UIViewContentModeScaleAspectFill;
  }
  return _imageView;
}

@end