如何将NSString从一个UIViewController传递到另一个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];
}
答
-(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);
}