在我的应用程序中，我有一个UICollectionView，其中一些单元格包含来自网络的图像，一些单元格通过UIWebView显示Youtube视频。当我按Back通过NavigationController时，内存似乎每次都会越来越多。我试过禁用视频播放器，它有点帮助，但仍然......
CollectionViewController
var listOfData = [SingleData]()
var Data:[[String:AnyObject]]?{
didSet{
for asset in Data! {
let info = SingleData.init(Data: asset)
listOfData.append(info)
}
}
}
override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(animated)
listOfData.removeAll()
Data?.removeAll()
imageCache.removeAllObjects()
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return listOfData.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Data Single Cell", forIndexPath: indexPath) as! CollectionViewControllerCell
cell.oneData = listOfData[indexPath.item]
return cell
}
CollectionViewControllerCell
@IBOutlet var videoWebView: UIWebView!
@IBOutlet var singleDataImageView: UIImageView!
var oneData:SingleData! {
didSet{
updateUI()
}
}
func updateUI(){
singleImageView.image = nil
if (oneData.isVideo == true) {
videoWebView.hidden = false
singleDataImageView.hidden = true
showVideo()
} else {
videoWebView.hidden = true
singleDataImageView.hidden = false
setImage(oneData.imageURL, singleDataImageView)
}
}
func showVideo() {
if let videoUrl = oneData.videoUrl {
let replacedString = videoUrl.replace("watch?v=", withString: "embed/")
videoWebView.scrollView.scrollEnabled = false
videoWebView.scrollView.bounces = false
videoWebView.allowsInlineMediaPlayback = true
let embededHTML = "<html><head><title>.</title><style>body,html,iframe{margin:0;padding:0;}</style></head><body><iframe width=\"\(videoWebView.frame.width)\" height=\"\(videoWebView.frame.height)\" src=\"\(replacedString)?&playsinline=1\" frameborder=\"0\" allowfullscreen></iframe></body></html>"
videoWebView.loadHTMLString(embededHTML, baseURL:nil)
}
}
func setImage(url : String?, _ imageView : UIImageView) {
imageView.image = nil
imageUrlString = url
if let cUrl = url {
if let imageFromCache = imageCache.objectForKey(cUrl) as? UIImage {
imageView.image = imageFromCache
return
}
if let urlImage = NSURL(string: cUrl) {
Request.sharedInstance.session.dataTaskWithURL(urlImage, completionHandler: { (data, response, error) in
if error != nil {
print(error)
return
}
dispatch_async(dispatch_get_main_queue(), {
let imageToCache = UIImage(data: data!)
if self.imageUrlString == url {
imageView.image = imageToCache
}
imageCache.setObject(imageToCache!, forKey: url!)
});
}).resume()
}
}
}
SingleData
class SingleData {
var imageURL:String? = nil
var videoUrl:String? = nil
var isVideo:Bool? = false
var dataAssets:Dictionary<String, AnyObject>?
init(Data : Dictionary<String, AnyObject>?){
dataAssets = Data
if Data!["MediaContent"]!["MediaType"] as? Int == 2 {
isVideo = true
}
imageURL = dataAssets!["MediaContent"]!["FileUrl"] as? String
videoUrl = dataAssets!["MediaContent"]!["FileName"] as? String
}
}