ios - 数据解析后重新加载 UICollection View
<p><p>我正在尝试动态更新 uicollectionview。我用了<a href="https://stackoverflow.com/questions/31735228/how-to-make-a-simple-collection-view-with-swift" rel="noreferrer noopener nofollow">this amazing tutorial</a>关于如何创建一个简单的 uicollection。</p>
<p>在使用静态项目数组时效果很好。我的问题 - 我想让 uicollection 填充我从数据库解析到新数组中的数据。在解析我的 json 数据后，我不确定如何重新加载 uicollection。 </p>
<p><strong>更新后的代码:</strong></p>
<pre><code>import UIKit
class Books: UIViewController, UICollectionViewDelegate {
@IBOutlet weak var bookscollection: UICollectionView!
var user_id: Int = 0;
//------------ init ---------------//
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(_ animated: Bool) {
showtutorial()
getuserid()
}
//------------ show books ---------------//
var booknames = ()
var bookcolor = ()
var bookdescription = ()
var bookid = ()
func posttoapi(){
//show loading
LoadingOverlay.shared.showOverlay(view: self.view)
//send
let url:URL = URL(string: "http://www.url.com")!
let session = URLSession.shared
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData
let paramString = "user_id=\(user_id)"
request.httpBody = paramString.data(using: String.Encoding.utf8)
let task = session.dataTask(with: request as URLRequest) {(data, response, error) in
//hide loading
LoadingOverlay.shared.hideOverlayView()
//no response
guard let data = data, let _:URLResponse = response, error == nil else {
print("response error")
return
}
//response, parse and send to build
let json = String(data: data, encoding: String.Encoding.utf8);
if let data = json?.data(using: String.Encoding.utf8){
let json = try! JSON(data: data)
for item in json["rows"].arrayValue {
//push data to arrays
self.booknames.append(item["name"].stringValue)
self.bookcolor.append(item["color"].stringValue)
self.bookdescription.append(item["description"].stringValue)
self.bookid.append(item["id"].int!)
//reload uicollection
DispatchQueue.main.sync(execute: {
self. bookscollection.reloadData()
})
}
}
}
task.resume()
}
//------------ collection -------------//
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("collection view code called")
return self.booknames.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = bookscollection.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! BooksCell
cell.myLabel.text = self.booknames
cell.backgroundColor = UIColor.cyan // make cell more visible in our example project
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
print("You selected cell #\(indexPath.item)!")
}
//------------ end ---------------//
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
</code></pre>
<p>感谢您的帮助!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我遇到了同样的问题..你的网址有很多图片意味着重新加载 t</p>
<pre><code>dispatch_async(dispatch_get_main_queue(), {
self.collectionView.reloadData()
})
</code></pre></p>
<p style="font-size: 20px;">关于ios - 数据解析后重新加载 UICollectionView ，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/44261236/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/44261236/
</a>
</p>
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