Question

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
     if (indexPath.item > 0 ) 
     {
       myNumber = indexPath.item;
       NSLog(@"Item is %i", myNumber);

       NSString *myNewString = [@(myNumber) stringValue];
       [txt setText:myNewString];

       self.datastring=txt.text;

       WeddingViewController *wed=[[WeddingViewController alloc]init];
       [self presentViewController:wed animated:YES completion:nil];
    }
}

并在第二个集合视图的viewDidLoad中.....

- (void)viewDidLoad
{
     [super viewDidLoad];
     self.lbl.text =self.datastring;
}

Answer 1

你可以像这样为WeddingViewController创建一个自定义构造函数（init）方法以及一个保存该值的属性：

在WeddingViewController.h文件中，创建构造函数方法：

@property (nonatomic, assign) int storedIntValue;

-(id)initWithValue:(int)intValue;

然后在您的实施文件中，您可以：

-(id)initWithValue:(int)intValue
{
    self = [super init];

    if(self)
    {
        self.storedIntValue = intValue;
    }

    return self;
}

-(void)viewDidLoad
{
    ....

    self.lbl.text = [[NSString alloc] initWithFormat:@"%d", self.storedIntValue];
}

最后，在你推送WeddingViewController的地方，你可以去：

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
     if (indexPath.item > 0 ) 
     {
       myNumber = indexPath.item;
       NSLog(@"Item is %i", myNumber);

       NSString *myNewString = [@(myNumber) stringValue];
       [txt setText:myNewString];

       self.datastring=txt.text;

       // ----------------------------------------------------
       // Notice use of the "initWithIntValue:" method
       //
       // note: is myNumber meant to be indexPath row ? 
       // ----------------------------------------------------
       WeddingViewController *wed=[[WeddingViewController alloc] initWithValue:myNumber];
       [self presentViewController:wed animated:YES completion:nil];
    }
}

否则，替代方法是在应用程序的某个地方存储可以全局访问的int值，例如单例，或者如果它是用户默认值，则可以使用：

// save value into NSUserDefaults if it's appropriate
[[NSUserDefaults standardDefaults] setValue:[NSNumber numberWithInt:3] forKey:@"myIntValue"];
[NSUserDefaults synchronize];

// get value from NSUserDefaults
int myIntValue = [[[NSUserDefaults standardDefaults] valueForKey:@"myIntValue"] integerValue];

这有帮助吗？

Answer 2

你必须这样做，你可以在WeddingViewController.h中创建字符串属性并直接在viewDidLoad中对其进行处理，

 @property (nonatomic, assign) NSString dataString;

并在viewWillAppear

中

    -(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
     self.lbl.text = dataString;
    }

    and when make WeddingViewController object give property like this,      

    WeddingViewController *wed=[[WeddingViewController alloc]init];
    wed.dataString = dataString;
    [self presentViewController:wed animated:YES completion:nil];

如何将int值加载到文本字段并显示在另一个集合视图控制器上的标签上

2 个答案: