ios - Objective C IOS prepareForSegue 如何获取分配给下一个 View Controller 的按钮的 int 变量

Question

所以我有一个 Collection View ，它使用核心数据动态生成一组按钮。我已经完成了为按钮分配按钮和值的部分。

    - (UICollectionViewCell *)collectionView:(UICollectionView   *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
        static NSString *identifier = @"Cell";

        [self.collectionView registerNib:[UINib nibWithNibName:@"CollectionViewCell" bundle:nil] forCellWithReuseIdentifier:identifier];

        CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

        [cell.myButton addTarget:self
                          action:@selector(collectionViewButtonPressed:)
                forControlEvents:UIControlEventTouchUpInside];

        UIImage *btnImage;

        btnImage = [UIImage imageNamed:[sportButtons objectAtIndex:indexPath.row]];

        NSNumber *sportsValue;

        sportsValue =[NSNumber numberWithInt:(int)[sportsNumber objectAtIndex:indexPath.row]];


        [cell.myButton setBackgroundImage:btnImage forState:UIControlStateNormal];

        return cell;
    }

所以这很好用

现在这是执行Segue的代码

- (void)collectionViewButtonPressed:(UIButton *)sender {

    [self performSegueWithIdentifier:@"venues" sender:self];
}

现在这段代码在这里，那么我如何在单元格/按钮中获取 sportsValue 以将其传递到下一个 View Controller ，以便我可以将它用作变量

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"venues"]) {

    //so how do I get that sportsValue in the cell/button to pass it onto to the next view controller so I can use it as a variable   

    }
}

Answer 1

这是一个示例，说明如何在 collectionViewButtonPressed 中获取 sportsValue 并将其传递给 nextVC-

在FirstViewController.m 类-

#import "YourNextVIewController.h"

@interface FirstViewController (){
    NSNumber *passSportsValue;  // this will hold your sports value when button pressed.
}
@end

- (UICollectionViewCell *)collectionView:(UICollectionView   *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *identifier = @"Cell";

    [self.collectionView registerNib:[UINib nibWithNibName:@"CollectionViewCell" bundle:nil] forCellWithReuseIdentifier:identifier];

    CollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];

    [cell.myButton addTarget:self
                      action:@selector(collectionViewButtonPressed:)
            forControlEvents:UIControlEventTouchUpInside];

    UIImage *btnImage;

    btnImage = [UIImage imageNamed:[sportButtons objectAtIndex:indexPath.row]];

    NSInteger sportsValue;

    sportsValue =[[sportsNumber objectAtIndex:indexPath.row]integerValue];

    [cell.myButton setBackgroundImage:btnImage forState:UIControlStateNormal];

    cell.myButton.tag= sportsValue; // or cell.myButton.tag=indexPath.row; No need to get sportsValue in this method

    // you can also use cell.myButton.superview.tag property to pass your sportsValue, if you don't want to use myButton.tag property

    return cell;
}
- (void)collectionViewButtonPressed:(UIButton *)sender {

    passSportsValue = [NSNumber numberWithInteger:sender.tag]; // i.e. your sportsValue

    /* if you are using indexPath.row i.e. cell.myButton.tag = indexPath.row;

     passSportsValue = [NSNumber numberWithInteger:[[sportsNumber objectAtIndex:sender.tag]integerValue]];

     */

    [self performSegueWithIdentifier:@"venue" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"venue"]) {
        YourNextVIewController *nextVC = [segue destinationViewController];
        nextVC.passNumber = passSportsValue;
    }
}

在 YourNextVIewController.h 类中添加这一行

@property (strong, nonatomic) NSNumber *passNumber;

现在您可以在 YourNextVIewController.m 中检查 passSportsValue

- (void)viewDidLoad {
    [super viewDidLoad];
     NSLog(@"%d",[self.passNumber integerValue]);
}

希望这能解决您的问题..