在这里，我遇到问题，我能够从 json Web 服务获取数据，但无法在我提到的程序中的 ui 上显示我收到错误的地方，以及还提到了什么，有人可以帮助我吗？
class DetailsViewController: UIPageViewController{
@IBOutlet var navigationBar: UINavigationBar!
@IBOutlet var imageView: UIImageView!
@IBOutlet var pageControl: UIPageControl!
@IBOutlet var nameLabel: UILabel!
@IBOutlet var priceLabel: UILabel!
@IBOutlet var textview: UITextView!
var productName :String?
var productprice :String?
var productdescription :String?
var thumbnailimageArray = [String]()
var imageArray = [String]()
var pageIndex: Int = 0
let urlString = "http://www.json-generator.com/api/json/get/cjpberBhKa?indent=2"
override func viewDidLoad() {
super.viewDidLoad()
self.downloadJsonWithURL()
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(swiped))
swipeLeft.direction = .left
self.imageView.addGestureRecognizer(swipeLeft) //unexpectely found nil while unwrapping an optional value
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(swiped))
swipeRight.direction = .right
self.imageView.addGestureRecognizer(swipeRight)
imageView.isUserInteractionEnabled = true
pageControl.numberOfPages = imageArray.count
pageControl.currentPage = pageIndex
// Do any additional setup after loading the view.
}
func downloadJsonWithURL() {
let url = NSURL(string: urlString)
URLSession.shared.dataTask(with: (url as URL?)!, completionHandler: {(data, response, error) -> Void in
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary {
print(jsonObj!.value(forKey: "Detail")!)
if let detailsArray = jsonObj!.value(forKey: "Detail") as? NSArray {
if let detailDict = detailsArray[0] as? NSDictionary {
if let name = detailDict.value(forKey: "productName") {
self.productName = name as? String
}
if let image1 = detailDict.value(forKey: "image1"){
self.imageArray.append(image1 as! String)
}
if let image2 = detailDict.value(forKey: "image2"){
self.imageArray.append(image2 as! String)
}
if let image3 = detailDict.value(forKey: "image3"){
self.imageArray.append(image3 as! String)
}
if let image4 = detailDict.value(forKey: "image4"){
self.imageArray.append(image4 as! String)
}
if let image5 = detailDict.value(forKey: "image5"){
self.imageArray.append(image5 as! String)
}
if let image6 = detailDict.value(forKey: "image6"){
self.imageArray.append(image6 as! String)
}
if let image7 = detailDict.value(forKey: "image7"){
self.imageArray.append(image7 as! String)
}
if let image8 = detailDict.value(forKey: "image8"){
self.imageArray.append(image8 as! String)
}
if let image9 = detailDict.value(forKey: "image9"){
self.imageArray.append(image9 as! String)
}
if let image10 = detailDict.value(forKey: "image10"){
self.imageArray.append(image10 as! String)
}
if let price = detailDict.value(forKey: "productPrice") {
self.productprice = price as? String
}
if let description = detailDict.value(forKey: "productDes") {
self.productdescription = description as? String
}
}
}
OperationQueue.main.addOperation({
self.navigationBar.topItem?.title = self.productName
self.textview.text = self.productdescription
self.priceLabel.text = self.productprice
print(self.imageArray)
let imgURL = NSURL(string:self.imageArray[0])
let data = NSData(contentsOf: (imgURL as URL?)!)
self.imageView.image = UIImage(data: data! as Data)
})
}
}).resume()
}
func swiped(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right :
if pageIndex == 0 {
}else{
pageIndex -= 1
}
imageView.image = UIImage(named: imageArray[pageIndex])
case UISwipeGestureRecognizerDirection.left:
if pageIndex >= imageArray.count-1{
}else{
pageIndex += 1
}
imageView.image = UIImage(named: imageArray[pageIndex])
default:
break
}
}
}
你用什么来显示图像func swiped(gesture: UIGestureRecognizer)方法执行如下
imageView.image = UIImage(named: imageArray[pageIndex])
但您的图像来自服务器，因此您只需显示产品的所有图像，就像您首先显示的那样OperationQueue.main.addOperation所以代替显示图像使用UIImage(named: imageArray[pageIndex])您需要将其转换为数据并将其显示到imageview和您修改的func swiped(gesture: UIGestureRecognizer)可能如下所示
func swiped(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right :
if pageIndex == 0 {
}else{
pageIndex -= 1
}
let imgURL = NSURL(string:self.imageArray[pageIndex])
let data = NSData(contentsOf: (imgURL as URL?)!)
self.imageView.image = UIImage(data: data! as Data)
case UISwipeGestureRecognizerDirection.left:
if pageIndex >= imageArray.count-1{
}else{
pageIndex += 1
}
let imgURL = NSURL(string:self.imageArray[pageIndex])
let data = NSData(contentsOf: (imgURL as URL?)!)
self.imageView.image = UIImage(data: data! as Data)
default:
break
}
}
}
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