从2个视图使用委托协议的合适方法是什么？

Question

I have a view controller, which uses a delegate protocol in order to pass back an array of strings. I now have another view controller, which I'd like to use the same protocol, but I've I use it I get a warning in Xcode Duplicate protocol definition of 'SearchDetailsDelegate' is ignored .

I need these two views to pass back an array for the parent view controller to parse. What would be a more appropriate way of achieve what I need to do here? Would key value observing be the way to go here?

Answer 1

You have few options:

1. rename your protocols to be different.

2. create an external protocol and adopt that protocol on each view

3. Add a property to your view called ParentController with a type of it's parent.

   @property (strong,nonatomic) ParentViewController *ParentController;

(synthesise that off course)

Then, in your viewController, when you instantiate the view assign the viewController as the parent

YourView *childView  = [[YourView alloc]init];
childView.parentController = self;

Now you can add a method in your viewController that can receive the strings array

-(void)setStringsArray:(NSArray*)arr{
     //do what ever you need with the array
     //don't forget to add this method to your .h file so it will be visible
}

Lastly send the strings array from the view: [self.parentController setStringsArray:yourArray];

BTW if you want to know what view send the array you can:

-(void)setStringsArray:(NSArray*)arr fromView:(UIView*)senderView{
     //do what ever you need with the array
     //don't forget to add this method to your .h file so it will be visible
} 

and use

    [self.parentController setStringsArray:yourArray fromView:self];

BTW 2 an other option will be to use notifications.

Answer 2

在单独的.h文件（目标c协议的新文件）中定义协议，然后将其包含在所需的视图控制器中。不建议在两个不同的视图控制器中重新定义相同的协议