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我从自定义类中保存时遇到问题。我试图在 NSUserDefaults 的代码中的某个位置保存错误，但它不起作用。

H 文件：

#import <Foundation/Foundation.h>
@interface Errors : NSObject<NSCoding>
@property (nonatomic,strong) NSString*  type;
@property (nonatomic,strong) NSString*  verNum;
@property (nonatomic,strong) NSString*  title;
@property (nonatomic,strong) NSString*  content;
@property (nonatomic,strong) NSString*  source;
@property (nonatomic,strong) NSString*  userId;
@property (nonatomic,strong) NSNumber*  videoId;

@end

M 文件：

#import "Errors.h"
@implementation Errors
@synthesize verNum;
@synthesize type;
@synthesize title;
@synthesize content;
@synthesize source;
@synthesize userId;
@synthesize videoId;

- (void)encodeWithCoder:(NSCoder *)encoder{
    [encoder encodeObject:self.verNum forKey:@"verNum"];
    [encoder encodeObject:self.type forKey:@"type"];
    [encoder encodeObject:self.title forKey:@"title"];
    [encoder encodeObject:self.content forKey:@"content"];
    [encoder encodeObject:self.source forKey:@"source"];
    [encoder encodeObject:self.userId forKey:@"userId"];
    [encoder encodeObject:self.videoId forKey:@"videoId"];
}

- (id)initWithCoder:(NSCoder *)decoder{
    self = [super init];
    if( self != nil ) {
        self.verNum = [decoder decodeObjectForKey:@"verNum"];
        self.type = [decoder decodeObjectForKey:@"type"];
        self.title = [decoder decodeObjectForKey:@"title"];
        self.content = [decoder decodeObjectForKey:@"content"];
        self.source = [decoder decodeObjectForKey:@"source"];
        self.userId = [decoder decodeObjectForKey:@"userId"];
        self.videoId = [decoder decodeObjectForKey:@"videoId"];
    }
    return self;
}
@end

保存：

errorsDitalis = [[Errors alloc]init];
errorsDitalis.verNum = (NSString *) [[request userInfo] objectForKey:@"verNum"];
errorsDitalis.type =(NSString *)  [[request userInfo] objectForKey:@"type"];
errorsDitalis.title =(NSString *)  [[request userInfo] objectForKey:@"title"];
errorsDitalis.content =(NSString *)  [[request userInfo] objectForKey:@"content"];
errorsDitalis.source =(NSString *)  [[request userInfo] objectForKey:@"source"];
errorsDitalis.userId =(NSString *)  [[request userInfo] objectForKey:@"userId"];
errorsDitalis.videoId =(NSNumber *)  [[request userInfo] objectForKey:@"videoId"];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:errorsDitalis forKey:@"ErrorList"];
[userDefaults synchronize];

加载：

Errors * newError = [[Errors alloc]init];
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
newError = [userDefaults objectForKey:@"ErrorList"];

它只是为 newErrors 返回 nil。我尝试使用此帮助，但没有奏效。有人有想法吗？

4

2 回答 2

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我想我应该这样做：

[[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:self.errorsDitalis] forKey:@"ErrorList"];
    [[NSUserDefaults standardUserDefaults] synchronize];

并不是：

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:errorsDitalis forKey:@"ErrorList"];
[userDefaults synchronize];

并加载：

newError = (Errors *)[NSKeyedUnarchiver unarchiveObjectWithData:[[NSUserDefaults standardUserDefaults] objectForKey:@"ErrorList"]];
于 2012-11-05T09:12:37.780 回答
0

尝试

[self setVerNum:[decoder decodeObjectForKey:@"verNum"]];

代替

self.verNum = [decoder decodeObjectForKey:@"verNum"];

我相信你应该在调用时使用设置器initWithCoder

于 2012-11-05T08:58:46.577 回答