我想要當我的項目有圖庫獲取圖像URL並創建imageView與URL數據並添加此圖像視圖滾動視圖子視圖,並滾動視圖子視圖之間滾動。我的imageView數組有6個imageView,但圖像視圖圖像是空的,我的滾動視圖分頁工作正常,但只有一個圖像顯示在滾動視圖中其他圖像視圖圖像是白色背景。有我的代碼。從URL下載圖片並添加到滾動視圖子視圖
在獲取數據從web服務創建網址的數組,然後調用getImageData mehtod
func getImageData() {
self.defaultImage.isHidden = true
self.scrollView.isHidden = false
scrollView.isPagingEnabled = true
scrollView.showsVerticalScrollIndicator = true
scrollView.showsHorizontalScrollIndicator = false
scrollView.isScrollEnabled = true
self.scrollView.willRemoveSubview(defaultImage)
for i in gallaryURL {
self.downloadImage(string: i)
}
Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(moveToNextPage), userInfo: nil, repeats: true)
}
func downloadImage(string: String) {
let imageUrl:URL = URL(string: string)!
// Start background thread so that image loading does not make app unresponsive
DispatchQueue.global(qos: .background).async {
let imageData:NSData = NSData(contentsOf: imageUrl)!
let myImageView = UIImageView(frame: CGRect(x:self.scrollWith!*2, y:0,width:self.scrollWith!, height:self.scrollHeight!))
myImageView.backgroundColor = #colorLiteral(red: 0.9568627477, green: 0.6588235497, blue: 0.5450980663, alpha: 1)
let image = UIImage(data: imageData as Data)
myImageView.image = image
// When from background thread, UI needs to be updated on main_queue
DispatchQueue.main.async {
self.allImage.append(myImageView)
self.scrollView.addSubview(myImageView)
self.scrollView.contentSize = CGSize(width:self.scrollView.frame.width * 4, height:self.scrollView.frame.height)
}
}
func moveToNextPage() {
let pageWidth:CGFloat = self.scrollView.frame.width
let maxWidth:CGFloat = pageWidth * 4
let contentOffset:CGFloat = self.scrollView.contentOffset.x
var slideToX = contentOffset + pageWidth
if contentOffset + pageWidth == maxWidth{
slideToX = 0
}
self.scrollView.scrollRectToVisible(CGRect(x:slideToX, y:0, width:pageWidth, height:self.scrollView.frame.height), animated: true)
}
如何解決這個問題呢?
可以附上你的項目 –
這是一個非常大的項目,這個小部分,我將以這個部分爲例。 – ava
ok附上示例項目 –