如何将数据从模态 ViewController 传输到父 ViewController？

Posted 2023-03-13

【中文标题】如何将数据从模态 ViewController 传输到父 ViewController？

【英文标题】：How do I transmit datas from modal ViewController to parent ViewController?

【发布时间】：2011-10-24 11:23:39

【问题描述】：

我的应用是标签栏（+导航）应用。在 FirstViewController 我调用 onModalView。

-(void) onFilter

  FilterViewController* controller =[[[FilterViewController alloc] initWithNibName:@"Filter" bundle:[NSBundle mainBundle]] autorelease];
  [self.navigationController presentModalViewController:controller animated:YES];

FilterViewController 中有很多过滤器可供用户选择。我想将用户偏好传输到 FirstViewController。我怎样才能做到这一点 ？

【参考方案1】：

我通常使用委托模式。喜欢：

@class FilterViewController;

@protocol FilterViewControllerDelegate
@required
- (void)filterViewController:(FilterViewController *)controller didSelectFilters:(NSInteger)filters;
@end

@interface FilterViewController : UIViewController 
    id<FilterViewControllerDelegate> _delegate;

@property (nonatomic, assign) id<FilterViewControllerDelegate> delegate;
@end

在你的FirstViewController:

-(void) onFilter

  FilterViewController* controller =[[[FilterViewController alloc] initWithNibName:@"Filter" bundle:[NSBundle mainBundle]] autorelease];
  controller.delegate = self;
  [self.navigationController presentModalViewController:controller animated:YES];


- (void)filterViewController:(FilterViewController *)controller didSelectFilters:(NSInteger)filters 
// Do something

在您的 FilterViewController 调用 - (void)filterViewController:(FilterViewController *)controller didSelectFilters:(NSInteger)filters 之前解除代理。