从其他视图控制器为uiimageview设置uiimage

Question

I have faced a problem with setting uiimageview from other viewcontroller.

DiaryDetailController.swift

let imageViewPageController = (segue.destinationViewController as! ImageViewPageController)
        if (imageCount > 0) {
            imageViewPageController.image1 = tempImage1
        }

ImageViewPageController.swift

let page: ImageViewDetailController! = storyboard?.instantiateViewControllerWithIdentifier("imageViewDetailController") as! ImageViewDetailController
            page.setImage(image1)
            pages.append(page)

ImageViewDetailController.swift

func setImage(image: UIImage) {
    imageView.image = image
}

And I got following error on "imageView.image = image". fatal error: unexpectedly found nil while unwrapping an Optional value

How should I solve this problem?

Answer 1

You're probably trying to set the image before the IBOutlets are set.

Create a UIImage property in ImageViewDetailController (let's call it image ), and instead of saying:

page.setImage(image1)

You can do this

page.image = image1

Then let the ImageViewDetailController deal with it once it has loaded. So in the viewDidLoad , just say

imageView.image = self.image