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AddCityViewController与相应的文本字段一起恢复。“取消”和“保存”按钮包含对代表的调用。模态视图控制器正在恢复，但“保存”和“取消”按钮未激活委托方法。所有视图控制器都在情节提要内创建。

//  AddCityViewController.h

@class City;

#import <UIKit/UIKit.h>
@protocol addCityDelegate;

@interface AddCityViewController : UIViewController
@property(nonatomic, weak) id <addCityDelegate> delegate;
@property(nonatomic,strong)NSManagedObjectContext *context;
@end

@protocol addCityDelegate
- (void)save: (City *)controller withBool:(BOOL )saveStatus;;
@end

取消按钮仅在未实现状态恢复时调用委托方法。

我希望在需要进行状态恢复时也调用代表

// AddCityViewController.m

- (IBAction)cancelButton:(UIBarButtonItem *)sender {
   [self.delegate save:nil withBool:false];
}

#pragma mark - encodeRestorable and decodeRestorable

- (void)encodeRestorableStateWithCoder:(NSCoder *)coder
{
   [super encodeRestorableStateWithCoder:coder];
   [coder encodeObject:self.delegate forKey:@"restoreDelegate"];
   [coder encodeObject:self.cityNameLabel.text          
                forKey:@"restoreCountyLabelText"];    
}

-(void)decodeRestorableStateWithCoder:(NSCoder *)coder
{
    [coder encodeObject:self.delegate forKey:@"restoreDelegate"];
    _cityNameLabel.text = [coder decodeObjectForKey:@"restoreCountyLabelText"];

    [super decodeRestorableStateWithCoder:coder];
}

是CityTableViewController代表AddCityTableView

// CityTableViewController.m

  #import "CityTableViewController.h"
  #import "AddCityViewController.h"

  #import "City.h"
  #import "County.h"

  @interface CityTableViewController ()<addCityDelegate>
  @property(nonatomic,strong)NSFetchedResultsController *fetchedResultsController;
  @end
  #pragma mark - AddConjugations Delete

...

下面的委托方法功能完美，除了状态恢复。在状态恢复期间，永远不会调用此方法。

 - (void)save: (AddCityViewController *)saveNewCity withBool:(BOOL )saveStatus
 {
    if (saveStatus) {
   ...
 }
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1 回答 1

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您正在尝试再次对您的委托进行编码而不是对其进行解码。

将您的代码更改为：

-(void)decodeRestorableStateWithCoder:(NSCoder *)coder {
    self.delegate = [coder decodeObjectForKey:@"restoreDelegate"];
    _cityNameLabel.text = [coder decodeObjectForKey:@"restoreCountyLabelText"];
    [super decodeRestorableStateWithCoder:coder];
}
于 2017-01-06T18:39:48.167 回答