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的标签上

Posted 2023-03-14

【中文标题】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的标签上

【英文标题】：how to load int value to the textfield and display on label on another collection view controller

【发布时间】：2014-05-27 08:58:39

【问题描述】：

- (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];
    

在第二个集合视图的viewDidLoad 中.....

- (void)viewDidLoad

     [super viewDidLoad];
     self.lbl.text =self.datastring;

【参考方案1】：

您可以像这样为您的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：

在您的WeddingViewController.h 文件中，创建构造方法：

@property (nonatomic, assign) int storedIntValue;

-(id)initWithValue:(int)intValue;

然后在你的实现文件中，你可以去：

-(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，替代方法是将 int 值存储在您的应用程序中可以全局访问的某个位置，例如单例，或者如果它是用户默认的东西，您可以使用：

// 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？

【参考方案2】：

你必须这样做，你可以在WeddingViewController.h中制作字符串属性并在viewDidLoad中直接访问它，

 @property (nonatomic, assign) NSString dataString;

并且在视图中会出现

    -(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];