SwiftAndOC

  func tappedButton(sender:UIButton!) {
      self.myImageView.image = LXHelpClass.getEllipseImageWithImage(self.myImageView.image)
      print(sender.tag, terminator: "swift")
  }

 @interface LXHelpClass : NSObject
 + (UIImage *)getEllipseImageWithImage:(UIImage *)originImage;
 @end

#import "OCAndSwift-swift.h"
- (void)pushBtnClicked:(UIButton *)sender
{
    SwiftController *swiftVC = [[SwiftController alloc] init];
    [self.navigationController pushViewController:swiftVC animated:YES];
}

class SwiftController: UIViewController {
    override func viewDidLoad() {
    ...
    }
    ...
}