如何将变量传递给下一个视图？

Question

我的应用有一个名为int antalratt 的变量，它是该视图中正确答案的数量。现在我想将该变量传递给下一个视图，我想在其中获得要显示的正确答案的数量！我知道如何为标签文本获取整数！

int antalratt 写在firstviewcontroller.m 中，我如何使它“全局”以便我可以在secondviewcontroller 中使用它？

提前致谢！

Answer 1

在 secondviewcontroller.h 的公共接口中创建一个变量

@property (nonatomic, strong) NSNumber *correctAnswers;

在.m中合成，然后在firstviewcontroller中用secondviewcontroller.correctAnswers = [NSNumber numberWithInt:antalratt];传递antalratt的值

到 secondviewcontroller。然后设置标签文本

Answer 2

方法一：

RootViewController

-(IBAction)nextPage{

    int antalratt = 12;    // Value to be transfered

    FirstViewController * fvc = [[FirstViewController  alloc] initWithNibName:@"FirstViewController" bundle:nil];
    fvc.answer = antalratt;
    [self presentModalViewController:fvc animated:YES];
    [fvc release];

}

FirstViewController

@interface FirstViewController : UIViewController
{

    int answer;
}
@property(nonatomic,assign) int  answer;



@implementation FirstViewController
@synthesize answer;

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"%d",answer);   // //displays answer on log
}

@end

方法二（AppDelegate）

AppDelegate

@interface AppDelegate : UIResponder <UIApplicationDelegate>
{

    int antalratt;
}
@property(nonatomic ,assign) int antalratt;

RootViewController

-(IBAction)nextPage{

    int antalratt = 12;    // Value to be transfered
    AppDelegate * delegate = [[UIApplication sharedApplication] delegate];
    delegate.antalratt = antalratt;

    FirstViewController * fvc = [[FirstViewController  alloc] initWithNibName:@"FirstViewController" bundle:nil];
    [self presentModalViewController:fvc animated:YES];
    [fvc release];
}

FirstViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    AppDelegate * delegate = [[UIApplication sharedApplication] delegate];
    NSLog(@"%d",delegate.antalratt);  //displays answer on log
}

方法 3 (NSUserDefaults)

RootViewController

-(IBAction)nextPage{
    int antalratt = 12;    // Value to be transfered
    [[NSUserDefaults standardUserDefaults] setInteger:antalratt forKey:@"answer"];
    FirstViewController * fvc = [[FirstViewController  alloc] initWithNibName:@"FirstViewController" bundle:nil];
    [self presentModalViewController:fvc animated:YES];
    [fvc release]; }

FirstViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    int ans = [[[NSUserDefaults standardUserDefaults] objectForKey:@"answer"] intValue];
    NSLog(@"%d",ans);  //displays answer on log
}

Answer 3

filename *detailViewController = [[filename alloc] initWithNibName:@"filename" bundle:nil];
detailViewController.audio=@"yourData";
[self presentModalViewController:detailViewController animated:YES];
[detailViewController release];

在文件名.h 中声明

NSString *audio;

@property(nonatomic,retain) NSString *audio;

和文件名.m

@synthesize audio;


 -(void) ViewDidLoad
 { 
      NSLog(@"Audio = %@",audio);   // if ur variable is integer declare %d in nslog.
 }

就是这样

Answer 4

// view1.h

@interface view1 : UIView{

NSString *passingVariable;

}

@property (nonatomic, strong) NSString *passingVariable;

@end

//

view1.m

@synthsize passingVariable;

@implementation view1

@end

//在另一个视图中

view2.m

#import "view1.h"

@implementation view2

-(IBAction)changeview

{

  view1 *myview = [[view1 alloc]init];

  myview.passingVariable = [NSString stringWithString:@"Hello Variable"];

  [self.navigationController pushViewController:myview animated:YES];

 }

@end