Question

选择项目是一个滑块。当我单击滑块时它会将数据传递给第二个VC（WebViewController）。但如何将数据从第一个视图控制器传递到objective-c中的第二个视图控制器？对不起，这是我第一次编写目标C。

第一个VC .m文件

#import "WebViewController.h"

- (void)viewDidLoad {
    [super viewDidLoad];
    arraySliderProducts = [[NSMutableArray alloc]init];
}


- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    [collectionView deselectItemAtIndexPath:indexPath animated:YES];

    UIViewController *controller = nil;


    switch (indexPath.row)
    {

        case 0:
        {
            WebViewController *WebViewController = [[WebViewController alloc] init];
            //error: No visible @interface for "WebViewController" declares the selector 'alloc'
            WebViewController.data = arraySliderProducts[indexPath.row][@"title"]; //pass this link value
            //error: Property 'data' not found on object of type 'WebViewController'
            [self.navigationController pushViewController: WebViewController animated:YES];
        }..

第二个VC .m文件

@interface WebViewController ()
@property (nonatomic, retain) NSString *data;

第二个VC .h文件

#import <UIKit/UIKit.h>

@interface WebViewController : UIViewController
{
    AppDelegate *appDelegate;
    NSString *data;
}
@end

Answer 1

需要注意的两点：

1：这不是启动视图控制器在您的应用中显示/显示的方式。

2：您应该在SecondVC的NSString *data文件中声明.h。

现在，第1点解决方案是在didSelectItemAtIndexPath：function

中使用下面的代码更改代码

switch (indexPath.row)
{
    case 0:
    {
        // By Default storyboard name is "Main". Change it if you you have different name in your project
        UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];

        // Now instantiate your view controller with its identifier on this storyboard object. 
        // Note: don't forget to set viewControllers' identifier
        WebViewController *vc = [mainStoryboard instantiateViewControllerWithIdentifier: @"WebViewController"];

        // Now Pass your value 
        WebViewController.data = arraySliderProducts[indexPath.row][@"title"]; 

        //Finally push this object on your navigation stack
        [self.navigationController pushViewController: WebViewController animated:YES];
    }... 
}

Answer 2

尝试

//Your class and obj name is same so You are getting this type of error

        WebViewController *VC = [[WebViewController alloc] init];
    //OR
        WebViewController *VC= [self.storyboard instantiateViewControllerWithIdentifier:@"WebViewController"];


        VC.data = arraySliderProducts[indexPath.row][@"title"]; 
        [self.navigationController pushViewController: VC animated:YES];

如何在objective-c中的视图控制器之间传递数据？

2 个答案: