将值从一个类传递给另一个类 [英] passing the value from one class to other class

问题描述

我在 DetailsOfPeopleViewController的标签中显示 AddNotesViewController Class的字符串值时遇到问题。

I am facing the problem in displaying the value of string of AddNotesViewController Class , in the Label of the DetailsOfPeopleViewController.

我想做的就是我们在1个类的 UITextView 中输入的内容，应该显示在另一个类的UILabel 。

All i want to do is whatever we entered in the UITextView of 1 class,should display in the UILabel of another class.

在文件 AddNotesViewController.h

   UITextView *txtView;

  @property(nonatomic,retain)IBOutlet     UITextView *txtView;

在文件 AddNotesViewController.m

 @synthesize txtView;

此后，当我点击标签栏项保存时，它应保存在数据库中，
保存到数据库并显示值但是它没有将值传递给

After this when i click on the tab bar item "save" then it should save in the data base , its saving to database and displaying the value also but its not passing the value to

DetailsOfPeopleViewController 。

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{

        NSLog(@"Tabbar selected itm %d",item.tag);

       switch (item.tag) {
          case 0:

         appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];


        NotesTable *crashNotInvolvingObj11 = (NotesTable *)[NSEntityDescription       
    insertNewObjectForEntityForName:@"NotesTable" inManagedObjectContext:[appDelegate    managedObjectContext]];

        // CameraViewController *camera=[[CameraViewController alloc] init];
            crashNotInvolvingObj11.personNote=[NSString    stringWithFormat:@"%@",txtView.text];

        DetailsOfPeopleViewController *detail=[DetailsOfPeopleViewController alloc];
        detail.testPersonNotesStr  =[NSString stringWithFormat:@"%@",txtView.text];
        //(value of testPersonNotesStr is DISPLYING here... )
        [appDelegate saveContext];
        [detail release];

        break;
        ..................

     }

in DetailsOfPeopleViewController.h

    NSString *testPersonNotesStr;
    UILabel *PersonNotesLbl;

     @property(nonatomic,retain)IBOutlet UILabel *PersonNotesLbl;
     @property(nonatomic,retain) NSString *testPersonNotesStr;

DetailsOfPeopleViewController.m

       @synthesize PersonNotesLbl;
       @synthesize  testPersonNotesStr;



      - (void)viewDidLoad
      {
         [super viewDidLoad];
            [PersonNotesLbl setText:testPersonNotesStr];

         NSLog(@"PERSON NOTE is........ %@",testPersonNotesStr);
           //(value of testPersonNotesStr is NOT DISPLYING here..... )

        }

请指导我在哪里犯错误。

Please guide me where am I doing the mistake.

推荐答案

在代码中做一些事情你会得到你的字符串

Just do few thing in your code you will get you string

1： - >

宣布你的 DetailsOfPeopleViewController 全局。

即。 in .h

DetailsOfPeopleViewController *detail  

2： - >

在viewDidLoad中将其分配到内存中

in your viewDidLoad alloc it in memory

detail=[[DetailsOfPeopleViewController alloc] init];  

3： - >

只需声明要复制的字符串属性

Just declare your string property to copy

@property(nonatomic,copy) NSString *testPersonNotesStr;  

或

您可以使用NSUserDefault

You can send data using NSUserDefault

SetValue

NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSString stringWithFormat:@"%@",txtView.text]; forKey:@"testPersonNotesStr"];
[defaults synchronize];

GetValue

testPersonNotesStr = [[NSUserDefaults standardUserDefaults] objectForKey:@"testPersonNotesStr"];
NSLog(@"PERSON NOTE is........ %@",testPersonNotesStr);  

关注我的回答我在addViewController中有NSString值，我想在UILabel中显示这个值DetailsViewController

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