Question

我无法获得archivedDataWithRootObject方法来调用encodeWithCoder，从我的理解看起来很简单，但它不起作用。这是代码：

#import <Foundation/Foundation.h>

@interface Details : NSObject <NSCoding>{

NSMutableArray *myArray;
}

@property(nonatomic,retain) NSMutableArray *myArray;

@end

#import "Details.h"

@implementation Details
@synthesize myArray;


-(id)init{
 [super init];
 return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder{

NSLog(@"initWithCoder");
if (self = [super init])
{
    self.myArray = [[aDecoder decodeObjectForKey:@"details"]retain];

} 
return self;
}

- (NSMutableArray*)getDetails{

NSLog(@"getDetials");
// NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
NSData *details = [[NSUserDefaults standardUserDefaults] objectForKey:@"details"];
if (details != nil){ 
  NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:details];
    if (oldSavedArray != nil)
        self.myArray = [[NSMutableArray alloc] initWithArray:oldSavedArray];
    else
        self.myArray = [[NSMutableArray alloc] initWithCapacity:1];
 }
 return self.myArray;
}

- (void) addDetails:(NSMutableArray *)details{

      NSLog(@"add Details");

     [self.myArray addObject:details]; 
     [NSKeyedArchiver archivedDataWithRootObject:self.myArray];
  }

- (void) encodeWithCoder:(NSCoder *)coder;
{
  NSLog(@"encodeWithCoder");
  [coder encodeObject:self.myArray forKey:@"details"];
} 

@end

NSLog（@“encodeWithCoder”）无法运行。我可能会遗漏一些东西，如果有人有任何想法，我们将不胜感激。

Answer 1

[NSKeyedArchiver archivedDataWithRootObject:self.myArray];

您告诉NSKeyedArchiver归档myArray变量，而不是您刚刚实施的<NSCoding>对象！

此方法还会返回NSData *，然后您需要在需要时单独写入磁盘。

试试这个：

NSData * archivedData = [NSKeyedArchiver archivedDataWithRootObject:self];

NSKeyedArchiver archivedDataWithRootObject：不调用encodeWithCoder

1 个答案: