UIImage和prepareforSegue無法傳遞圖像

Question

這是我的代碼：

@property (weak, nonatomic) IBOutlet UIImageView *chosedImage;

    - (IBAction)cropImageTap:(id)sender {

        [self dismissViewControllerAnimated:YES completion:^{
             UIImage * pickedImage = self->_chosedImage;
            //[UIImage imageNamed:@"helloWorld.jpg"];

            [self performSegueWithIdentifier:@"gotomainimage" sender:pickedImage];

        }];
    }

我的表演賽如下：

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


        PostVC *vc = (PostVC*)segue.destinationViewController;
        UIImage *img = (UIImage*)sender;

        if (img.images == nil) {
            NSLog(@"null img");
             vc.Sourcemage = img;
        }
        else {

             NSLog(@"not null img");
             vc.Sourcemage = img;
        }

    }

我只得到空圖像。我的圖像不來。我在這里做什么問題？

請幫幫我

更新 ：

我更新的代碼，工作方式-給我控制台信息，例如：

其null數據-將vc發布為非null圖像-prepareForSegue方法

無法找出為什么會發生。

     - (IBAction)cropImageTap:(id)sender {


        UIImageView * pickedImage = _chosedImage;
        [self dismissViewControllerAnimated:YES completion:^{
            [self performSegueWithIdentifier:@"gotomainimage" sender:pickedImage.image];
        }];
    }

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

        PostVC *vc = (PostVC*)segue.destinationViewController;
        UIImage *img = (UIImage*)sender;

        if (img != nil) {
             NSLog(@"its not an null image");
            vc.Sourcemage = img;

        } else {
             NSLog(@"its an null image");
        }
    }

in my postvc :

    @property(nonatomic) UIImage *Sourcemage;
    - (void)viewWillAppear:(BOOL)animated {
        [super viewWillAppear:animated];



        if (self.Sourcemage != nil){
            NSLog(@"not null dataa");

            _PostImageView.image = _Sourcemage;

        } else {
    NSLog(@"not null dataa");
           _PostImageView.image = [UIImage imageNamed:@"Travel.png"];
        }


    }

Answer 1

目標viewcontroller（PostVC）中的變量Sourcemage是UIImage嗎？

請檢查該屬性是否為UIImage。

Answer 2

這是因為您正在傳遞UIImageView而不是UIImage

如下更新代碼，

UIImageView * pickedImage = _chosedImage;
[self dismissViewControllerAnimated:YES completion:^{
   [self performSegueWithIdentifier:@"gotomainimage" sender:pickedImage.image];
}];

在上面的代碼中，您必須傳遞UIImage而不是UIImageView本身，並像這樣處理它，

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    PostVC *vc = (PostVC*)segue.destinationViewController;
    UIImage *img = (UIImage*)sender;
    vc.Sourcemage = img;
}

Answer 3

你為什么不這樣做呢？

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    PostVC *vc = (PostVC*)segue.destinationViewController;
    vc.Sourcemage = _checkedImage;
}