问使用ios中的自定义委托从其他视图控制器更改一个视图控制器NSSdictonary的值

EN

@protocol MyProtocol <NSObject>
  - (void)callback;
@end

@interface MyClass : NSObject <MyProtocol>
@property (nonatomic, copy) NSMutableDictionary *myDictionary;
@end

@implementation MyClass
// class methods

  -(void)callback {
    // edit dict here
  }

@end

@interface MySecondClass : NSObject
@property (weak, nonatomic) id<MyProtocol> delegate;
@end

@implementation MySecondClass
// class methods

- (void)someMethod {
  // some logic
  if ([self.delegate respondsToSelector:@selector(callback)]) {
    [self.delegate callback];
  }  
}
@end