我无法从自定义类中保存NSUserdefaults

Question

我遇到了从自定义类中保存的问题。我试着在NSUserDefaults的代码中保存某些地方的错误，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档：

#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]; 

装载：

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

它只是为newErrors返回nil。我试图使用this帮助，但它没有奏效。有人有想法吗？

Answer 1

尝试

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

，而不是

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

我相信你应该使用setter方法，当你调用initWithCoder

Answer 2

我想我应该做的事：

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

和不：

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

并与加载：

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