将数据从一个ViewController发送到另一个。 [英] Sending data from one ViewController to another.

问题描述

我有两个ViewController：

I have got two ViewController:

1） ViewController

2） TestAppViewController

在 ViewController.h 一个标签，它的文本我想从第二个viewController发送，即`TestAppViewController。

In ViewController.h, I define a label, whose text I want to be sent from second viewController, i.e `TestAppViewController.

为此我定义了一个 @property NSString * code>在 ViewController.h ，并在我的第二个控制器中创建了这个ViewController的对象。

For this I defined a @property NSString * in ViewController.h, and created an object of this ViewController in my second Controller. Then passed a value to this property, but ans is still coming nil.

以下是我的代码：

@property (nonatomic, retain) NSString *lableName;*

$ b b

ViewController

ViewController

#import "ViewController.h
#import "TestAppView1.h"
#import "TestAppViewController2.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    //    [self addView1];
}

- (void)viewWillAppear:(BOOL)animated
{ 
    [self addView1];

    NSLog(@"Label name is %@",self.lableName);
}    

- (void)didReceiveMemoryWarning
{
   [super didReceiveMemoryWarning];
   // Dispose of any resources that can be recreated.
}

- (void)addView1
{
    TestAppView1 *testAppView1Obj = [ [TestAppView1 alloc]        initWithFrame:self.view.bounds];

    [testAppView1Obj setDelegate:self];
    [testAppView1Obj setSelectorOnButtonTapped:@selector(buttonTapped)];

    [self.view addSubview:testAppView1Obj];
}

 -(void)buttonTapped
 {

    TestAppViewController2 *testAppViewController2Obj =[[TestAppViewController2    alloc]initWithNibName:@"TestAppViewController2" bundle:nil];

    [self.navigationController pushViewController:testAppViewController2Obj animated:YES];
 }

 @end

ViewController2

ViewController2

#import "TestAppViewController2.h"
#import "TestAppView2.h"
#import "ViewController.h"

@interface TestAppViewController2 ()

@end

@implementation TestAppViewController2

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

-(void)viewWillAppear:(BOOL)animated
{
    [self addView2];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}



- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)addView2
{
    TestAppView2 *testAppView2Obj =[ [TestAppView2 alloc]initWithFrame:self.view.bounds];

    [testAppView2Obj setDelegate:self];
    [testAppView2Obj setSelectorOnBackButton:@selector(callbackButtonTapped)];
    [self.view addSubview:testAppView2Obj];
}

-(void)callbackButtonTapped
{

    ViewController *viewControllerObj = [[ViewController alloc]init];

     viewControllerObj.lableName=@"Yogesh";    
     [self.navigationController popViewControllerAnimated:YES];


}

@end

当我尝试打印NSLog中的值，它给我nil。

When I try to print the values in NSLog, it gives me nil.

推荐答案

使用委托：

在TestAppViewController.h中：

In TestAppViewController.h:

   @protocol messageDelegate <NSObject>
    @optional
    -(void)test:(NSString*)str;
    @end
    @interface SecondViewController : NSString
    @property (nonatomic, assign) id <messageDelegate> delegate;
    @end

在TestAppViewController.m中：

In TestAppViewController.m:

-(void)readyToSend
{
    [self.delegate test:@"Hello world!"];

}

在ViewController.h中：

In ViewController.h:

@interface ViewController : UIViewController<messageDelegate>
@end

在ViewController.m中：

In ViewController.m: in

- (void)viewDidLoad {
TestAppViewController * testAppViewController = [[TestAppViewController alloc] init];
testAppViewController.delegate = self;
}
-(void) test:(NSString*)str{
NSLog(@"%@,str");
}

希望它会有帮助！

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