如何在不同视图中按下另一个按钮时更改按钮的文本

Question

在我的项目中，我试图计算选定的行数，然后当我按下按钮时，它会转到上一个视图，并且该视图中的按钮文本应更改为选定的行数。我意识到我一定犯了一个简单的错误，但无法弄清楚。我将不胜感激。

这是我在 .m 文件中使用的代码：

- (IBAction)doneButton:(id)sender
{
    appDelegate = (AppDelegate*) [[UIApplication sharedApplication] delegate];
    CountryModel *countryModel = [[CountryModel alloc]init];

    CompareViewController *compareViewController = [[CompareViewController alloc]init];

        [compareViewController. addCountries setTitle:[NSString stringWithFormat:@"%ld Countries Selected", countId] forState:(UIControlState)UIControlStateNormal];
        NSLog(@"%ld",countId);
//    compareViewController.addCountries.titleLabel.text = [NSString stringWithFormat:@"%ld Countries Selected", countId];
    compareViewController.Cid = countryModel.Id;
    [self.navigationController pushViewController:compareViewController animated:YES];
}

这里是 CompareViewController 的 .h 代码：

@interface CompareViewController : UIViewController

@property (assign) NSInteger Cid;
- (IBAction)addRemoveCountries:(id)sender;
@property (weak, nonatomic) IBOutlet UIButton *addCountries;

Answer 1

从你的代码中我看到你甚至在初始化视图之前就设置了标题。您应该做的是将属性添加到您的 CompareViewController 设置中。并在 CompareViewController 的 viewDidLoad: 方法中将此标题设置为您的按钮。

编辑：

在你的 CompareViewController.h 添加一个属性:

@property (nonatomic, strong) NSString *buttonTitleyouNeedToSet;

在doneButton:中初始化后添加以下ling compareViewController

compareViewController.buttonTitleyouNeedToSet = [NSString stringWithFormat:@"%ld Countries Selected", countId];

In CompareViewController.m in viewDidLoad: 设置按钮标题：

[addCountries setTitle:buttonTitleyouNeedToSet forState:(UIControlState)UIControlStateNormal];

Answer 2

像这样

AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;

    NSArray *arr = appDelegate.navController.viewControllers;

    for (UIViewController *vc in arr) {
        if (vc isKindOfClass:[CompareViewController class]) {
            CompareViewController *cvc = (CompareViewController *)vc;
            [cvc.btn setTitle:@"Hello" forState:UIControlStateNormal];
            break;
        }
    }

希望这对您有所帮助

如何在不同视图中按下另一个按钮时更改按钮的文本

How to change text of a button when another button is pressed in a different view

iphone

ios8

xcode6.3