如何在 Swift 中的 Collection View 上显示图像数组
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【中文标题】如何在 Swift 中的 Collection View 上显示图像数组【英文标题】：How to display array of images on Collection View in Swift 【发布时间】：2017-08-02 05:19:18 【问题描述】：func numberOfSections(in collectionView: UICollectionView) -> Int
return 1
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
print("gallery count : \(self.arrayGallerySingle.count)")
return self.arrayGallerySingle.count
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gallerycell", for: indexPath) as! GalleryViewCell
return cell
//API Fetching method
func galleryFetch()
let prs = [
"id": dealIDGallery,
"deal_single_page": "1" as String
]
Service.StartWithoutLoading(prs as [String : AnyObject]?, onCompletion: result in
let jsonResponseSingle = result as? NSDictionary
print(" jsonResponse\(String(describing: jsonResponseSingle))")
if let resultGallery = jsonResponseSingle?.value(forKey: "result") as? NSArray
for keyValuesGallery in resultGallery
let gallerySingle = (keyValuesGallery as AnyObject).value(forKey: "gallery_images") as? NSArray
print("Gallery Images Key: \(gallerySingle)")
self.arrayGallerySingle = gallerySingle as! [AnyObject]
DispatchQueue.main.async () -> Void in
self.collectionView?.reloadData()
)
如何在 UICollectionViewCell 上显示带有键 gallery_images 的图像数组？这条线 print("Gallery Images Key: \(gallerySingle)") 在控制台上打印所需的图像数组，但我无法在 collectionView 上显示。我的JSON 回复是http://www.jsoneditoronline.org/?id=8eccb63976d76be7d0b2d1b0e8f02306。我也在我的项目中使用SDWebImage。我已经检查了datasource 连接和collectionView IBoutlet 以及单元格内的图像。我是 Swift 的初学者，请帮助，如果需要任何进一步的信息，请询问
【问题讨论】：
【参考方案1】：Swift 3.0这是我更新的答案希望它也能帮助别人
func numberOfSections(in collectionView: UICollectionView) -> Int
return 1
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
print("gallery count : \(self.arrayGallerySingle.count)")
return self.arrayGallerySingle.count
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gallerycell", for: indexPath) as! GalleryViewCell
if let imgUrl = arrayGallerySingle[indexPath.row] as? String
if let url = NSURL(string: imgUrl)
cell.galleryImage?.sd_setImage(with: url as URL, placeholderImage: UIImage(named: "place holder image"), options: .lowPriority)
else
let alertController = UIAlertController(title: "No Gallery Images", message: "test", preferredStyle: .alert)
let okButton = UIAlertAction(title: "Okay", style: .default, handler: nil)
alertController.addAction(okButton)
alertController.present(alertController, animated: true, completion: nil)
return cell
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets
return UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat
return 0.0
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat
return 0.0
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
return CGSize(width: collectionView.frame.size.width/2, height: collectionView.frame.size.height/3)
func galleryFetch()
let prs = [
"id": dealIDGallery,
"deal_single_page": "1" as String
]
Service.StartWithoutLoading(prs as [String : AnyObject]?, onCompletion: result in
let jsonResponseSingle = result as? NSDictionary
print(" jsonResponse\(String(describing: jsonResponseSingle))")
if let resultGallery = jsonResponseSingle?.value(forKey: "result") as? NSArray
for keyValuesGallery in resultGallery
let gallerySingle = (keyValuesGallery as AnyObject).value(forKey: "gallery_images") as? NSArray
print("Gallery Images Key: \(gallerySingle)")
self.arrayGallerySingle = gallerySingle as! [AnyObject]
if self.arrayGallerySingle.count > 0
DispatchQueue.main.async () -> Void in
self.collectionView?.reloadData()
else
let alertController = UIAlertController(title: "Message", message: "No images found.", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: self.doSomething))
self.present(alertController, animated: true, completion: nil)
)
【讨论】：
【参考方案2】：Swift 3.0
您可以使用 SDWebcache 实现这种方式以在 collectionView 单元格图像中加载图像。
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "gallerycell", for: indexPath) as! GalleryViewCell
if let imgUrl = arrayGallerySingle[indexPath.row] as? String
if let url = URL(string: imgUrl)
//Replace with your imageView outlet
cell.imageView.sd_setImageWithURL(url, placeholderImage: UIImage(named: "place holder image"), options: .lowPriority)
return cell
如果要在 collectionView 中显示 6 个单元格，则必须将 UICollectionViewLayout 方法设置为定义的单元格大小，如下所示。
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
return CGSize(width: collectionView.frame.size.width/2, height: collectionView.frame.size.height/3)
您可以在数组计数不为空时显示警报以及为什么在 for 循环中重新加载 Collection 视图，如下所示实现它。
Service.StartWithoutLoading(prs as [String : AnyObject]?, onCompletion: result in
let jsonResponseSingle = result as? NSDictionary
print(" jsonResponse\(String(describing: jsonResponseSingle))")
if let resultGallery = jsonResponseSingle?.value(forKey: "result") as? NSArray
for keyValuesGallery in resultGallery
let gallerySingle = (keyValuesGallery as AnyObject).value(forKey: "gallery_images") as? NSArray
print("Gallery Images Key: \(gallerySingle)")
self.arrayGallerySingle = gallerySingle as! [AnyObject]
if self.arrayGallerySingle.count > 0
DispatchQueue.main.async () -> Void in
self.collectionView?.reloadData()
else
let alertController = UIAlertController(title: "Your Title", message: "their is no images", preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
self.present(alertController, animated: tru, completion: nil)
)
【讨论】：
它解决了我的问题，我想在集合视图中一次显示 6 张图像，没有单元格间距@Jaydeep 我也想显示警报我没有图像是他们的@Jaydeep 如果他们没有图片，我想显示警报@Jaydeep @Sunny，检查更新的答案。显示警报很简单，只需要检查图像数组计数。 检查@Jaydeep以上是关于如何在 Swift 中的 Collection View 上显示图像数组的主要内容，如果未能解决你的问题，请参考以下文章
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