iOS：对象在alloc和init之后返回nil描述

Question

对象在alloc和init之后返回nil描述。任何人都可以告诉我我必须显示来自服务器的数据...当我单击“ edit”按钮时，它将进入该类中的小房间类。在文本字段中必须显示该信息。有谁能帮助我

@interface HeadOfficeDetails : NSObject

@property(nonatomic,strong) NSMutableArray *ofcContact;

@property(nonatomic,strong) OfficeDocument *ofcDocument;
@property(nonatomic,strong) OfficePrice *ofcPrice;
@property(nonatomic,strong) CityClass *city;
@property(nonatomic,strong) StateClass *state;
@property(nonatomic,strong) DistrictClass *district;

@property(nonatomic,strong)NSString *shrtname;
@property(nonatomic,strong)NSString *shwrmname;
@property(nonatomic,strong)NSString *shop;
@property(nonatomic,strong)NSString *door;
@property(nonatomic,strong)NSString *buildng;
@property(nonatomic,strong)NSString *flr;
@property(nonatomic,strong)NSString *tele;
@property(nonatomic,strong)NSString *pin;
@property(nonatomic,strong)NSString *main;
@property(nonatomic,strong)NSString *dist;
@property(nonatomic,strong)NSString *designan;
@property(nonatomic,strong)NSString *depart;
@property(nonatomic,strong)NSString *emai;
@property(nonatomic,strong)NSString *mobile;
@property(nonatomic,strong)NSString *strt;
@property(nonatomic,strong)NSString *area;


@property(nonatomic,strong) NSString *jwleryname;
@property(nonatomic,strong) NSString *officeid;


-(void)setAttributes:(NSDictionary *)attributes;




///////////////////////////////////////////////
showroom class



 headdetails=[[HeadOfficeDetails alloc]init];


self.txtshowroom.text=headdetails.jwleryname;
NSLog(@"%@ :",self.txtshowroom.text);


NSNumber *officeid=headdetails.officeid;
NSLog([NSString stringWithFormat:@"%@",officeid]);

[self.txtshortname setText:headdetails.jwleryname];
[self.txtshowroom setText:headdetails.shwrmname];
[self.txtstreet setText:headdetails.strt];
[self.txtarea setText:headdetails.area];
[self.txtmain setText:headdetails.main];
[self.txtbuilding setText:headdetails.buildng];
[self.txtname setText:self.cntctcls.contactname];
[self.txtdesign setText:self.cntctcls.desig];
[self.txtdepartmnt setText:self.cntctcls.depart];
[self.txtmbl setText:self.cntctcls.mobile];
[self.txtemail setText:self.cntctcls.email];
[self.txtfloor setText:headdetails.flr];
[self.txttel setText:headdetails.tele];
[self.txtpincode setText:headdetails.pin];
[self.txtshop setText:headdetails.shop];

Answer 1

这是我的示例代码，用于显示NSObject类数据，这些数据在从服务器获取数据期间保存并通过使用其实例在另一个类上显示。

以下是创建用于存储FBLogin userDetauls的NSObject类：

#import <Foundation/Foundation.h>

@interface FBUser : NSObject

@property (nonatomic,strong) NSString *FBUserId;
@property (nonatomic,strong) NSString *FBUserName;
@property (nonatomic,strong) NSString *FBUserFirstName;
@property (nonatomic,strong) NSString *FBUserLasttName;
@property (nonatomic,strong) NSString *FBUserEmail;
@property (nonatomic,strong) NSString *FBUserBio;
@property (nonatomic,strong) NSString *FBUserLocation;

+(instancetype)SharedFBUser;
-(void)ClearFBuser;
+(NSString*)CheckEmtryElseAlert:(NSString*)strValue;

@end

下面是一个实现类在这里，我们创建SharedFBUser是allcate FBUser如果发现零，所以当不需要做代码对象一次alloc init期间放映时间

#import "FBUser.h"


static FBUser* fbObject;

@implementation FBUser

+(instancetype)SharedFBUser
{
    if(fbObject == nil)
    {
        fbObject =[[FBUser alloc]init];
    }

    return fbObject;
}
-(void)ClearFBuser
{

    fbObject = nil;
    self.FBUserId = nil;
    self.FBUserName = nil;
    self.FBUserFirstName =nil;
    self.FBUserLasttName = nil;
    self.FBUserEmail = nil;
    self.FBUserBio = nil;
    self.FBUserLocation = nil;

}

现在下面的代码说明如何使用FBUser类保存数据.H类：

#import <UIKit/UIKit.h>
#import "FBUser.h"
@interface LoginViewController : UIViewController
@property(nonatomic,strong)FBUser *fbObject;
@end

您可以将数据保存在FBCallback中：

[[[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:@{@"fields": @"id, name, link, first_name, last_name, picture.type(large), email, birthday, bio ,location ,friends ,hometown , friendlists"}]
     startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
         if (!error)
         {
             NSLog(@"resultis:%@",result);
             [FBUser SharedFBUser].FBUserId =[result valueForKey:@"id"];
             [FBUser SharedFBUser].FBUserEmail =[result valueForKey:@"email"];
              [FBUser SharedFBUser].FBUserName =[result valueForKey:@"name"];
             [FBUser SharedFBUser].FBUserFirstName =[result valueForKey:@"first_name"];
             [FBUser SharedFBUser].FBUserLasttName =[result valueForKey:@"last_name"];
         }
         else
         {
             NSLog(@"Error %@",error);
         }
     }];

以下代码显示了存储在FBuser类中的数据

 #import "FBUser.h"
    self.lblEmail.text = [FBUser SharedFBUser].FBUserEmail;
    self.lblusename.text = [FBUser SharedFBUser].FBUserName;
    self.lblfirstname.text = [FBUser SharedFBUser].FBUserFirstName;
    self.lbllastname.text = [FBUser SharedFBUser].FBUserLasttName;

希望对本文的使用和创建有所帮助。 这是我的工作代码。

Answer 2

不确定您在做什么，可能需要像parse dictionary这样的对象才能首先成为对象。

headdetails=[[HeadOfficeDetails alloc]init];

创建了新对象，因此所有属性都将为零。

您需要为其分配值，例如

headdetails=[[HeadOfficeDetails alloc]initWithDictionary:attributes];

您可以自己解析它，也可以查看一些第3个库，例如： JSonModel