从JSON设置后立即取消分配模型属性

时间:2014-12-26 02:04:17

标签: ios objective-c json properties

在我的模型上设置NSString属性后,它立即返回为Null。奇怪的是,设置任何typedef属性都会被保留(即NSInteger)。代码如下。我也通过GCD运行这种方法 - 但我对此进行了评论。它没有改变任何东西。我在模型中也有一些NSCoding方法,但是注释掉委托并没有改变任何东西。

字面上一切正常,包括访问JSON dict和NSLogging结果,EXCEPT用于设置非typedef的模型属性。

更新

将任何NSString分配给[dictionary valueForKey:@“first_name”]会返回Null,所以这是访问字典的问题。

更新2

记录字典后,我注意到某些keyss没有“”而某些值没有“”。我正在使用rails中的as_json,并且在postman chrome扩展中,这个DOESNT发生了

{
available = 1;
boxing = 0;
certificates = "";
city = A;
"created_at" = "2014-12-14T07:23:35.445Z";
description = "Short description";
"drivers_license" = CA12345;
"drivers_license_expiration" = "12/20";
"drivers_license_state" = CA;
email = "test4@aol.com";
"facebook_id" = "";
"first_name" = TEsty;
gender = "";
id = 1;
"last_name" = Again;
latitude = "<null>";
longitude = "<null>";
password = g;
pilates = 0;
"reset_password_token" = "<null>";
running = 0;
strength = 0;
"updated_at" = "2014-12-25T08:42:27.122Z";
yoga = 0;
}

.h文件

@interface FSTrainer : NSObject <NSCoding>

@property (nonatomic) NSInteger id;
@property (nonatomic, strong) NSString* first_name;
@property (nonatomic, strong) NSString* last_name;

- (id) init;
- (id) initWith:(NSMutableDictionary *)dictionary;

等。

.m文件

-(id)init{
 self = [super init];
 if (!self) return nil;
 return self;
}

- (id) initWith:(NSMutableDictionary *)dictionary
{
 self = [super init];
 if (!self) return nil;


  if ([dictionary valueForKey:@"id"] != [NSNull class])
    {self.id = [[dictionary valueForKey:@"id"] integerValue];}

  if ([dictionary valueForKey:@"first_name"] != [NSNull class])
    {
        [self setFirst_name:[dictionary valueForKey:@"first_name"]];

        NSLog(@"%@", [dictionary objectForKey:@"first_name"]);
        NSLog(@"%@", [dictionary valueForKey:@"first_name"]);}
        //Both NSLogs print out the correct names

  if ([dictionary valueForKey:@"last_name"] != [NSNull class])
    {self.last_name = [valueForKey objectForKey:@"last_name"];}

 etc.... 

return self;
}

这是通过以下方式调用的:

    dispatch_async(dispatch_get_global_queue(0, 0), ^{
        [self computationForRails];
    });

功能

-(void)computationForRails{
...
    FSTrainer* currentTrainer = [[FSTrainer alloc] initWith:[tempdict    valueForKey:@"data"]];
    //sol-added JNKeychian
    [JNKeychain saveValue:currentTrainer forKey:@"current_trainer"];
}

tempdict等于(数据是字典中的键)

    id jsonObject = [NSJSONSerialization JSONObjectWithData: data
                                                    options: NSJSONReadingMutableContainers
                                                      error: &error];

我稍后访问该模型的位置(我保存的模型未正确设置其属性,因此这是应用程序崩溃的地方

    FSTrainer* current_trainer = [JNKeychain loadValueForKey:@"current_trainer"];
    NSString* trainerName = current_trainer.first_name;

1 个答案:

答案 0 :(得分:1)

替换您的代码

[self setFirst_name:[dictionary valueForKey:@"first_name"]];

使用此代码

[self setFirst_name:[NSString stringWithFormat:@"%@",[dictionary valueForKey:@"first_name"]]];

它为我工作