我無法從自定義類保存NSUserdefaults

Question

我從自定義類保存時遇到問題。 我試圖在NSUserDefaults的代碼中保存某些地方的錯誤，但是它不起作用。

H檔：

#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檔：

#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];

正在加載：

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

它只是為newErrors返回nil。 我嘗試使用此幫助，但是沒有用。 有人有主意嗎？

Answer 1

嘗試

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

代替

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

我相信您在調用initWithCoder時應該使用initWithCoder

Answer 2

我認為我應該這樣做：

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

並不是：

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

並加載：

newError = (Errors *)[NSKeyedUnarchiver unarchiveObjectWithData:[[NSUserDefaults standardUserDefaults] objectForKey:@"ErrorList"]];