Ios UIImageView将(segue)nil传递给另一个ViewController
经过一天的研究和尝试,我来帮助你 我有一个collectionView将图像传递给imageView,就像instagram(让你想象一下界面),我认为我正确地执行了segue,但在另一个viewController上它最终为零 我的代码如下: 第一视图控制器>Ios UIImageView将(segue)nil传递给另一个ViewController,ios,swift,uiimageview,uicollectionview,segue,Ios,Swift,Uiimageview,Uicollectionview,Segue,经过一天的研究和尝试,我来帮助你 我有一个collectionView将图像传递给imageView,就像instagram(让你想象一下界面),我认为我正确地执行了segue,但在另一个viewController上它最终为零 我的代码如下: 第一视图控制器> // TakePhotoViewController.swift import UIKit import Photos class TakePhotoViewController: UIViewCo
// TakePhotoViewController.swift
import UIKit
import Photos
class TakePhotoViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
@IBOutlet weak var photoImageView: UIImageView!
var imageArray = [UIImage]()
override func viewDidLoad(){
super.viewDidLoad()
grabPhotos()
}
@IBAction func postPhotoTaken(_ sender: Any) {
self.performSegue(withIdentifier: "photoPost", sender: self)
}
func grabPhotos(){
let imgManager = PHImageManager.default()
let requestOptions = PHImageRequestOptions()
requestOptions.isSynchronous = true
requestOptions.deliveryMode = .highQualityFormat
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]
if let fetchResult: PHFetchResult = PHAsset.fetchAssets(with: .image, options: fetchOptions){
if fetchResult.count > 0 {
for i in 0..<fetchResult.count{
imgManager.requestImage(for: fetchResult.object(at: i), targetSize: CGSize(width: 200, height: 200), contentMode: .aspectFill, options: requestOptions, resultHandler: {image, error in
self.imageArray.append(image!)
})
}
}
else {
print("You Don't Have Any Photos!")
}
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imageArray.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
let imageView = cell.viewWithTag(1) as! UIImageView
imageView.image = imageArray[indexPath.row]
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
photoImageView.image = imageArray[indexPath.row]
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = collectionView.frame.width / 3 - 1
return CGSize(width: width, height: width)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 1.0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 1.0
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "photoPost" {
let photoPost = segue.destination as! PhotoPostTableViewController
let imagePhoto = self.photoImageView.image
photoPost.photo = imagePhoto!
}
}
}
// photoPostViewController.swift
import UIKit
class PhotoPostTableViewController: UITableViewController {
var photo: UIImage!
@IBOutlet weak var newPhoto: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
newPhoto.image = photo
print(photo)
}
override func viewDidAppear(_ animated: Bool) {
newPhoto.image = photo
print(photo)
}
}
你们能帮帮我吗?基于这样一个事实,
prepare(for:)
中的segue.identifier
返回nil,这意味着执行的segue是由情节提要触发的,而不是由后期拍摄(u.sender:Any)
触发的
检查情节提要,找到从第一个VC到第二个VC并由按钮触发的序列,然后将其标识符
更改为“photoPost”
我相信在那之后你可以删除
postPhotoTaken(uu.sender:Any)
如果你在让imagePhoto=self.photoImageView.image上中断,self.photoImageView.image的值是多少?那一行被调用了吗?对不起,我是Swift编程新手,我添加了断点,但似乎根本没有被调用。我甚至在那一行下面写了一个打印,并添加了一个断点,但控制台上没有显示任何内容。如果segue.identifier==“photoPost”{:print(“>>>\(segue.identifier)”,请将下面的一行放在前面
要找出执行的序列的标识符是什么-然后你可以将条件更改为新的代码你的序列标识符实际上是“photoPost”吗?在postPhotoTaken()
中,他正在尝试执行该序列,所以我猜他有一些连接不正确的地方