如何将数据从父视图控制器传递到子视图控制器？ [英] How can I passing data from parent view controller to child view controller?

问题描述

如何将数据从父视图控制器传递给子视图控制器？

我尝试这样做与代理。但我不认为这是一个选择？

解决方案

选项1

如果您从父级传递到子视图控制器，那么只需从父级设置childViewController的属性。

  customChildViewController.someRandomProperty = @一些随机值; 
 [self presentViewController：customChildViewController animated：YES completion：nil]; 
  

选项2

或者，你可以设置委托

步骤1：在ChildViewController.h文件中设置界面上方

 $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $;;;;;;;;;;;;;;;;;; 
 
 @end 
 
 @interface ..... 
  

步骤2：在ChildViewController.h界面中创建委托属性

  @property（strong，nonatomic）id< ChildViewControllerDelegate>委托
  

步骤3：在ParentViewController.h中声明委托协议

  @interface ParentViewController：UIViewController< ChildViewControllerDelegate> 
  

步骤4：在ParentViewController.m中添加此方法：

   - （NSDictionary *）giveMeData {
 NSMutableDictionary * dataToReturn = [[NSMutableDictionary alloc] init]; 
 dataToReturn [@some] = @random; 
 dataToReturn [@data] = @here; 
 return dataToReturn; 
} 
  

步骤5：在启动childViewController之前声明委托属性。

  childViewController.delegate = self; 
 [self presentViewController：childViewController animated：YES completion：nil]; 
  

步骤6：在子视图控制器中，只要你想要数据添加这个

  NSMutableDictionary * dataFromParent = [self.delegate giveMeData]; 
  

parentVC将运行'giveMeData'并返回一个NSMutableDictionary（调整所需要的数据） p>

How can I passing data from parent view controller to child view controller?

I tried doing this with delegates. but I don't think it's an option?

解决方案

Option 1

If you're passing from a parent to a child view controller, then just set the property of your childViewController from the parent.

customChildViewController.someRandomProperty = @"some random value";
[self presentViewController:customChildViewController animated:YES completion:nil];

Option 2

Or, you can set up a delegate

Step 1: set up protocol above interface in ChildViewController.h file

@protocol ChildViewControllerDelegate

- (NSDictionary *) giveMeData;

@end

@interface  .....

Step 2: create delegate property in ChildViewController.h interface

@property (strong, nonatomic) id<ChildViewControllerDelegate>delegate

Step 3: declare delegate protocol in ParentViewController.h

@interface ParentViewController : UIViewController <ChildViewControllerDelegate>

Step 4: in ParentViewController.m add this method:

- (NSDictionary *) giveMeData {
    NSMutableDictionary * dataToReturn = [[NSMutableDictionary alloc]init];
    dataToReturn[@"some"] = @"random";
    dataToReturn[@"data"] = @"here";
    return dataToReturn;
}

Step 5: before launching childViewController declare delegate property.

childViewController.delegate = self;
[self presentViewController:childViewController animated:YES completion:nil];

Step 6: in child view controller whenever you want data add this

NSMutableDictionary * dataFromParent = [self.delegate giveMeData];

The parentVC will run 'giveMeData' and return a NSMutableDictionary (adjust for whatever data you want)

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