转场后无法在下一个 ViewController 上从 UIImagePickerController 加载图像 [英] Fails to load image from UIImagePickerController on next ViewController after segue

问题描述

我正在尝试在下一个视图控制器上加载在 UIImagePickerController 上选择的图片.我在类似的线程上进行了一些搜索，并找到了一些帮助我设置它的线程，但是图像并没有真正转移"到下一个视图控制器.

I am trying to load a picture selected on UIImagePickerController on the next view controller. i did some search on similar threads and found a few that helped me set it up, but the image does not really get 'transfered' to the next view controller.

这是我的 didFinishPickingImage 和 prepareForSegue 代码:

this is my code for the didFinishPickingImage and prepareForSegue:

- (void)imagePickerController:(UIImagePickerController *)picker
                              didFinishPickingImage:(UIImage *)image 
                              editingInfo:(NSDictionary *)editingInfo
{
    self.imageChosen = image;
    [picker dismissModalViewControllerAnimated:NO];
    [self performSegueWithIdentifier:@"Edit" sender:self];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{
    if ([segue.identifier isEqualToString:@"Edit"]){
    EditViewController *editViewController = 
                       (EditViewController *)segue.destinationViewController;
    editViewController.imageView.image = self.imageChosen;
}

我正在运行到 EditViewController 的 segue，但是那里的 imageView 没有加载图片.我猜这个作业是错误的，但我看不出是怎么回事.

I am getting the segue running to the EditViewController, but the imageView there doesnt load the picture. I guess the assignment is wrong somehow but I fail to see how.

推荐答案

当您尝试将图像设置为 EditViewController UIImageView 它不存在，因为 EditViewController 尚未加载.而不是将图像设置为 UIImageView 直接在 EditViewController 中创建一个实例变量来保存图像.然后将此图像分配给 viewDidLoad:

When you try to set image to EditViewController UIImageView it doesn't not exist because EditViewController not loaded yet. Instead of setting image to UIImageView directly create an instance variable in EditViewController that will hold image. And than assign this image to UIImageView in viewDidLoad:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{
    if ([segue.identifier isEqualToString:@"Edit"]){
    EditViewController *editViewController = 
                   (EditViewController *)segue.destinationViewController;
    editViewController.image = self.imageChosen;
}

//EditViewController.h
...
@property (nonatomic, strong) UIImage *image;
...

//EditViewController.m
- (void)viewDidLoad {
    ...
    self.imageView.image = self.image;
    ...
}

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