text: //
  //  NSNull+Safe.h
  //  RGUIKit
  //
  //  Created by renge on 2018/11/21.
  //  Copyright © 2018 ld. All rights reserved.
  //
  
  #import <Foundation/Foundation.h>
  
  NS_ASSUME_NONNULL_BEGIN
  
  @interface NSNull(RGSafe)
  
  - (nullable id)objectAtIndexedSubscript:(NSUInteger)idx;
  - (nullable id)objectForKeyedSubscript:(id)key;
  - (BOOL)isEqualToString:(NSString *)aString;
  - (NSUInteger)count;
  - (NSUInteger)length;
  
  @end
  
  NS_ASSUME_NONNULL_END
  