在prepareForSegue中设置UIImageView.image [英] set UIImageView.image in prepareForSegue

问题描述

我想选择一个具有UIImageView的photoViewController. 在flickrTVC中，我说:

I want to segue to a photoViewController that has an UIImageView. In flickrTVC, I say:

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"showPhoto"])
    {
        photoViewController *vc = [segue destinationViewController];
        UIImage *photo = [UIImage imageWithContentsOfFile:@"images/en.jpeg"];
        [vc setDisplayedPhoto:photo];
    }
}

和setDisplayedPhoto方法的实现是:

and the setDisplayedPhoto method's implementation is:

-(void)setDisplayedPhoto:(UIImage *)image
{
    [_imageView setImage:image]; //@property (nonatomic, strong) IBOutlet UIImageView *imageView;
}

但是当我进行搜索时，UIImageView是白色的...为什么会这样?

But when I do segue, the UIImageView is white... Why could this be?

推荐答案

您的目标视图控制器在源视图控制器收到prepareForSegue:sender:消息时尚未加载其视图层次结构.因此，目标VC的_imageView变量是nil.

Your destination view controller hasn't loaded its view hierarchy by the time your source view controller receives the prepareForSegue:sender: message. So your destination VC's _imageView variable is nil.

推荐的方法是将图像(或者可能更好的图像文件名)存储为目标VC的属性，然后在目标VC的viewDidLoad或viewWillAppear:方法中设置图像视图的图像

The recommended approach is to store the image (or, probably even better, the image file name) as a property of the destination VC, and then set the image view's image in the destination VC's viewDidLoad or viewWillAppear: method.

这篇关于在prepareForSegue中设置UIImageView.image的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！