ios - 目标 ViewController 在 segue 后没有改变

Question

我的目标 ViewController 有许多标签和图像需要根据特定的先前 ViewController 进行更改。我有一个 segue 设置，它应该改变这些但由于某种原因它不是，即使正在调用 segue。

我的初始 ViewController 有一个按钮，它有一个 segue 传递给下一个名为“aName”的 ViewController。我可能遗漏了一些简单的东西，但我一直在关注我的代码的另一部分，它做同样的事情并且有效!我还测试了使用返回正常的 NSLog 成功调用了 segue。所有 IBOutlets 也被正确分配。

初始 View Controller .m:

#import "dViewController.h"

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
        if ([segue.identifier isEqualToString:@"aName"]) {
            dViewController *dVC = (dViewController *)segue.destinationViewController;
            dVC.TitleLabel.text = @"abc";
            dVC.1Img.image = [UIImage imageNamed:@"somepath.jpg"];
            dVC.2Img.image = [UIImage imageNamed:@"somepath2.jpg"];
            [dVC.1Button setTitle:@"abcd" forState:UIControlStateNormal];
            [dVC.1Button setTitle:@"efgh" forState:UIControlStateNormal];

        }

目标 View Controller :

dViewController.h

    @property (strong, nonatomic) IBOutlet UILabel *TitleLabel;
    @property (strong, nonatomic) IBOutlet UIImageView *1Img;
    @property (strong, nonatomic) IBOutlet UIImageView *2Img;
    @property (strong, nonatomic) IBOutlet UIButton *1Button;
    @property (strong, nonatomic) IBOutlet UIButton *2Button;

编辑:通过多做一些环顾四周，我认为我应该使用委托(delegate)。这看起来很复杂，而且不太确定我从哪里开始。但我会看看这个线程中的内容:Changing label's text in another view controller

Answer 1

您必须为每个要更改的标签创建一个变量，并在 viewDidLoad 中将变量分配给 label.text

例如

 - (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    if ([segue.identifier isEqualToString:@"aName"]) {
        dViewController *dVC = (dViewController *)segue.destinationViewController;
        dVC.titleString = @"abc";
        dVC.1Image = [UIImage imageNamed:@"somepath.jpg"];
        dVC.2Image = [UIImage imageNamed:@"somepath2.jpg"];
        dVC.1ButtonString=@"ButtonTitle";
        dVC.2ButtonString=@"ButtonTitle2";

    }

在目标 Controller 中

    @property (strong, nonatomic) IBOutlet UILabel *TitleLabel;    
    @property (strong, nonatomic) IBOutlet UIImageView *1Img;      
    @property (strong, nonatomic) IBOutlet UIImageView *2Img;      
    @property (strong, nonatomic) IBOutlet UIButton *1Button;  
    @property (strong, nonatomic) IBOutlet UIButton *2Button;  

    @property(strong,nonatomic)NSString *2ButtonString;  
    @property(strong,nonatomic)UIImage*1Image;  
    @property(strong,nonatomic)UIImage*2Image;  
    @property(strong,nonatomic)NSString* titleString;  
    @property(strong,nonatomic)NSString *1ButtonString;  
    @property(strong,nonatomic)UIImageView *1Img;  
    @property(strong,nonatomic)UIImageView *1Img;  



 - (void)viewDidLoad{

   self.TitleLabel.text = self.titleString;

   self.1Img.image = self.1Image;

   self.2Img.image = self.2Image;

   [self.1Button setTitle:self.1ButtonString];

   [self.2Button setTitle:self.1ButtonString];

}

希望对你有帮助，问题是用

 dViewController *dVC = (dViewController *)segue.destinationViewController; 

您只带 Controller 而不带 View 。并且 IBOutlet 属于 View 并且 View 未加载我希望你理解