需要幫助才能理解這個Objective-C代碼片段

Question

下面是在Facebook移動應用中實現的代碼發佈到用戶的牆上。如何將值更改爲發佈牆中的Textview.text，而用戶必須鍵入它。

- (IBAction)publishStream:(id)sender { 
    SBJSON *jsonWriter = [[SBJSON new] autorelease]; 
    NSDictionary* actionLinks = [NSArray arrayWithObjects:[NSDictionary dictionaryWithObjectsAndKeys: @"Always Running", @"text", @"http://itsti.me/", @"href", nil], nil]; 
    NSString *actionLinksStr = [jsonWriter stringWithObject:actionLinks]; 
    NSDictionary* attachment = [NSDictionary dictionaryWithObjectsAndKeys: 
          @"a long run", @"name", 
          @"The Facebook Running app", @"caption", 
          @"it is fun", @"description", 
          @"http://itsti.me/", @"href", nil]; 
    NSString *attachmentStr = [jsonWriter stringWithObject:attachment]; 

    NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys: 
           @"Share on Facebook", @"user_message_prompt", 
           actionLinksStr, @"action_links", 
           attachmentStr, @"attachment", 
           nil]; 


    [_facebook dialog:@"feed" andParams:params andDelegate:self]; 
} 

Answer 1

NSDictionary* attachment = [NSDictionary dictionaryWithObjectsAndKeys: 
         nameTextField.text, @"name", 
         captionTextField.text, @"caption", 
         descriptionTextField.text, @"description", 
         hrefTextField.text, @"href", nil]; 
NSString *attachmentStr = [jsonWriter stringWithObject:attachment]; 

我不知道，如果你允許用戶編輯所有的人，如果不只是改變你需要一個NSString你定義的。