未还原弱引用委托

Question

AddCityViewController将与其相应的文本字段一起还原。"取消"one_answers"保存"按钮包含对委托的调用。模式视图控制器正在恢复，但"保存"one_answers"取消"按钮未激活委托方法。所有视图控制器都已在情节提要中创建。

//  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"按钮仅在未执行状态恢复时调用委托方法。

我希望代表在需要进行状态恢复时也能被呼叫

// 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];
}

CityTableViewController是AddCityTableView 的委托

// 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

除了STATE RESTORATION之外，下面的委托方法运行良好。在状态恢复期间，从不调用此方法。

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

Answer 1

您试图再次对委托进行编码，而不是对其进行解码。

将代码更改为：

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