Swift：在每个子类中导入UIKit？

一个.导入超类中的文件

#import "MyAwesomeClass.h"

@interface MySuperViewController : UIViewController
@end

@implementation MySuperViewController
- (void)viewDidLoad {
  [super viewDidLoad];

  //MyAwesomeClass allocated,initialized,used
  MyAwesomeClass *awesomeClass = [MyAwesomeClass new];
}
@end

湾使用在超类中导入的文件,在子类中不重新导入它

@interface MySubViewController : MySuperViewController
@end

@implementation MySubViewController
- (void)viewDidLoad {
  [super viewDidLoad];

  //No compilation error,since MyAwesomeClass already imported in superclass
  MyAwesomeClass *awesomeClass = [MyAwesomeClass new];
}
@end

尝试在swift中执行相同的操作会产生编译错误：

一个.在MySuperViewController中导入UIKit

import UIKit
class MySuperViewController : UIViewController {
   @IBOutlet weak var enterPrice: UITextField!
}

湾声明和使用UITextField的对象而不在MySubViewController中导入UIKit

class MySubViewController: MySuperViewController {
    // compilation error at below line
    @IBOutlet weak var myButton: UIButton!
}

有什么办法可以避免在上面的场景中重新导入UIKit吗？请建议.