ios - 无法通过当前模态序列将图像传递给另一个 UIViewController
<p><p>我试图将图像传递给目标 <code>UIView</code> 的另一个 <code>imageView</code>，该目标 <code>UIView</code> 连接到源 <code>UIView</code> 超过当前的模态 segue。</p >
<p>我试图通过 segue 传递数据，并通过 Outlet 在源 UIView 中设置图像(即 NSData - 核心数据)，但我收到错误 <a href="http://i.stack.imgur.com/i8PNc.png" rel="noreferrer noopener nofollow">image description </a>在控制台中 -</p>
<blockquote>
<p>"fatal error: unexpectedly found nil while unwrapping an Optional
value"</p>
</blockquote>
<pre><code>//Code of destination UIView
import UIKit
import CoreData
class ReviewViewController: UIViewController {
@IBOutlet var backgroundImageView:UIImageView!
var subject:Semester!
override func viewDidLoad() {
super.viewDidLoad()
backgroundImageView?.image = UIImage(data: subject.image!)
let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Dark)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = view.bounds
backgroundImageView.addSubview(blurEffectView)
// Code of Source UIView
import UIKit
import CoreData
class SubjectDetailViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet var facultyImageView:UIImageView!
var subject:Semester!
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "destinationidentifier"
{
let destinationController = segue.destinationViewController as! ReviewViewController
destinationController.backgroundImageView?.image = self.facultyImageView.image
}
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>您的问题是 <code>backgroundImageView</code> 对象为零，因为 <code>destinationController</code> 当前不在 <code>window</code> 层次结构中。</p>
<p>所以像这样改变你的 <code>prepareForSegue</code></p>
<pre><code>override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "destinationidentifier"
{
let destinationController = segue.destinationViewController as! ReviewViewController
destinationController.image = self.facultyImageView.image
}
}
</code></pre>
<p>现在在 <code>ReviewViewController</code> 中创建一个图像对象，如下所示，并在 <code>viewDidLoad</code></p> 中添加一行
<pre><code>var image: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
self.backgroundImageView?.image = self.image
}
</code></pre>
<p>希望对你有帮助</p></p>
<p style="font-size: 20px;">关于ios - 无法通过当前模态序列将图像传递给另一个 UIViewController，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/37936430/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/37936430/
</a>
</p>
页:
[1]