Swift 将图像链接到集合视图中
我正在尝试从url获取图像到我的集合视图中。可以显示的图像数量取决于阵列计数 这是我的密码:Swift 将图像链接到集合视图中,swift,uicollectionview,swift3,Swift,Uicollectionview,Swift3,我正在尝试从url获取图像到我的集合视图中。可以显示的图像数量取决于阵列计数 这是我的密码: class CollectionViewController: UICollectionViewController { @IBOutlet weak var searchBox: UITextField! var imageArray:[String] = [] override func viewDidLoad() { super.viewDidLoad() } let
class CollectionViewController: UICollectionViewController {
@IBOutlet weak var searchBox: UITextField!
var imageArray:[String] = []
override func viewDidLoad() {
super.viewDidLoad()
}
let link = "https://www.googleapis.com/my_link_is_here"
guard let url = URL(string: link) else {
print("Error: cannot create URL")
return
}
let request = URLRequest(url: url)
URLSession.shared.dataTask(with: request) { data, response, error in
guard error == nil else {
print("error calling GET on /todos/1")
print(error!)
return
}
do{
guard let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String : Any] else {
print("\(error?.localizedDescription)")
return
}
//print("The todo is: " + json.description)
guard let todotitle = json["items"] as? [Any] else {
print("Could not get todo title from JSON")
return
}
let arrcnt = todotitle.count
var i = 0
while (i < arrcnt){
guard let todotitle1 = todotitle[i] as? [String: Any] else {
print("Could not get todo title1 from JSON")
return
}
guard let todotitle2 = todotitle1["image"] as? [String : Any] else {
print("Could not get todo title2 from JSON")
return
}
guard let todotitle3 = todotitle2["thumbnailLink"] as? String else {
// continue
print("Could not get todo title3 from JSON")
return
}
self.imageArray.append(todotitle3)
print(self.imageArray)
i += 1
}
}catch{
print("error trying to convert data to JSON")
return
}
}.resume()
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
// MARK: UICollectionViewDataSource
override func numberOfSections(in collectionView: UICollectionView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of items
return self.imageArray.count
}
class CollectionViewController:UICollectionViewController{
@IBVAR搜索框:UITextField!
var imageArray:[字符串]=[]
重写func viewDidLoad(){
super.viewDidLoad()
}
让链接=”https://www.googleapis.com/my_link_is_here"
guard let url=url(字符串:链接)else{
打印(“错误:无法创建URL”)
返回
}
let request=URLRequest(url:url)
URLSession.shared.dataTask(with:request){data,response,中的错误
保护错误==nil else{
打印(“调用GET on/todos/1时出错”)
打印(错误!)
返回
}
做{
guard let json=try JSONSerialization.jsonObject(with:data!,options:[])作为?[String:Any]其他{
打印(“\(错误?.localizedDescription)”)
返回
}
//打印(“待办事项是:”+json.description)
guard let todotitle=json[“items”]作为?[Any]其他{
打印(“无法从JSON获取todo标题”)
返回
}
让arrcnt=todotitle.count
变量i=0
而(iInt{
//#警告未完成执行,返回节数
返回1
}
重写func collectionView(collectionView:UICollectionView,numberOfItemsInSection:Int)->Int{
//#警告未完成执行,返回项目数
返回self.imageArray.count
}
问题是当我写“return self.imageArray.count”时,它返回nil。它采用空数组的数组的初始化值。如何计算附加后的最终数组。在执行
while
循环后,需要在主线程上重新加载集合视图。您还可以通过使用单个guard
语句而不是多个语句来减少代码,并使用for循环而不是while,因此整个代码都是这样的
do{
guard let json = try JSONSerialization.jsonObject(with: data!, options: []) as? [String : Any] else {
print("\(error?.localizedDescription)")
return
}
//print("The todo is: " + json.description)
guard let array = json["items"] as? [[String : Any]] else {
print("Could not get todo title from JSON")
return
}
for dic in array {
guard let imageDic = dic["image"] as? [String : Any], let thumbnailLink = imageDic["thumbnailLink"] as? String else {
print("Could not get thumbnailLink")
return
}
self.imageArray.append(thumbnailLink)
}
//Now you need to reload the collectionView on main thread.
DispatchQueue.main.async {
self.collectionView.reloadData()
}
}
可以显示imageArray的声明吗?类CollectionViewController:UICollectionViewController{@IBOutlet弱变量搜索框:UITextField!var imageArray:[字符串]=[]重写func viewDidLoad(){super.viewDidLoad()永远不要在评论中添加你的代码,而不要编辑你的问题。这已经完成了。你有任何错误吗?只有通过重新加载集合视图?@GauravKapur Welcome mate:)@GauravKapur Hey请现在接受答案,然后它对你有效。