如何将NSString从一个UIViewController传递到另一个UIViewController？ [英] How to pass the NSString from One UIViewController to Another UIViewController?

问题描述

可能的重复：

iOS - 将变量传递给查看控制器

有两个ViewController（ViewController1和ViewController2），我想传递一个String值和一个IBAction从ViewController1到ViewController2。我试图读取ViewController2的ViewDidLoad方法中的NSString（* check）值，但它返回一个空值。

I have two Viewcontrollers (ViewController1 and ViewController2) , And i want to pass a String value along with a IBAction from ViewController1 to ViewController2. I am trying to read the NSString (*check) value in ViewController2's ViewDidLoad method, but it's returning a null value.

帮助我，并提前感谢。

Help me out and Thanks in advance.

// ViewController1

@interface ViewController1 : UIViewController {

        IBOutlet UIButton *btn1;
        IBOutlet UIButton *btn2;
        NSString *check;
    }
#import "ViewController.h"

-(IBAction)buttonClicked:(id)sender {

    check = [[NSString alloc] init];

    if (btn1.tag == 0) {
        check = @"foo";
        NSLog(@"%@",check);    
    }
    if (btn2.tag == 1) {
        check = @"bar";
        NSLog(@"%@",check);
    }
} 

b
$ b

in my second view controller ,

#import <UIKit/UIKit.h>

@class ViewController1;

@interface ViewController2 : UIViewController {

    ViewController1 *viewCon;
}

@property(nonatomic,retain) ViewController *viewCon;

//.m

#import "ViewController2.h"
#import "ViewController1.h"

@synthesize viewCon,

 - (void)viewDidLoad
{
    ViewController *myVC = [[ViewController alloc] init];
    NSLog(@"  Label  %@",myVC.check);
    [super viewDidLoad];
}

推荐答案

-(IBAction)buttonClicked:(id)sender {

   //check = [[NSString alloc] init]; -- NO Need

    if (btn1.tag == 0) {
        check = @"foo";
        NSLog(@"%@",check);    
    }
    if (btn2.tag == 1) {
        check = @"bar";
        NSLog(@"%@",check);
    }

  ViewController2 *obj = [[ViewController2 alloc] initWithNibName:@"ViewController2"];
  [obj setCheck:check];
  //push to ViewController2
  [obj release];

}

，

#import <UIKit/UIKit.h>

@interface ViewController2 : UIViewController {

        NSString *check;
}
@property (nonatomic, retain) NSString *check;


//.m

#import "ViewController2.h"

@synthesize check;


 - (void)viewDidLoad
{
    NSLog(@"  Label  %@",check);
}

这篇关于如何将NSString从一个UIViewController传递到另一个UIViewController？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！