如何在Swift中使用URLSession添加UIActivityIndicatorView？
如何在Swift中使用URLSession添加UIActivityIndicatorView？
提问于 2019-01-04 09:08:55
我有一个Master-Detail项目，我在该项目中解析来自JSON的数据。其目的是在等待数据获取并加载到DetailsViewController时，将UIActivityIndicatorView (通过使用URLSession)添加到DetailsViewController。我尝试了几种方法，在主控中启动UIActivityIndicatorView，如下所示：
let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in我也不知道在哪里停止它，我已经在DetailViewController的ViewDidLoad()中尝试过了(在configureView()之前)：
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
configureView()
}但也没有起作用。我在任何地方都找不到使用URLSession的状态添加活动指示器的信息。在这里，我添加了MasterViewController中的代码，我尝试在其中启动活动指示器：
let arrayOfUrls = [ URL(string: "http://www.omdbapi.com/?t=The+Dark+Knight&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Lord+of+the+Rings%3A+The+Return+of+the+King&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=Forrest+Gump&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=Inception&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Matrix&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=Interstellar&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Pianist&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Intouchables&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Departed&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Prestige&apikey=f85dc75e") ]
for url in arrayOfUrls {
let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
if let error = error {
print (error)
} else {
if let data = data {
do {
let movie = try JSONDecoder().decode(Movie.self, from: data)
print(movie.Title)
self.objects.append(movie.Title)
self.details.append(movie)
} catch {
print("Json Processing Failed")
}
}
}
}
task.resume()
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2019-01-04 14:04:51
创建NetworkService类并在函数中进行api调用，这种方式会更好。
class NetworkService {
let arrayOfUrls = [ URL(string: "http://www.omdbapi.com/?t=The+Dark+Knight&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Lord+of+the+Rings%3A+The+Return+of+the+King&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=Forrest+Gump&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=Inception&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Matrix&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=Interstellar&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Pianist&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Intouchables&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Departed&apikey=f85dc75e"), URL(string: "http://www.omdbapi.com/?t=The+Prestige&apikey=f85dc75e") ]
func getData(completion:@escaping(Movie)->()){
for url in arrayOfUrls {
let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
var movie = Movie()
if let error = error {
print (error)
} else {
if let data = data {
do {
movie = try JSONDecoder().decode(Movie.self, from: data)
print(movie.Title)
self.objects.append(movie.Title)
self.details.append(movie)
} catch {
print("Json Processing Failed")
}
}
}
completion(movie)
}
task.resume()
}
}}
在视图控制器中调用你的函数：
let networkService = NetworkService()
activityIndicator.startAnimating()
networkService.getData { result in
self.activityIndicator.stopAnimating()
//result your movie data do whatever yo want it
DispatchQueue.main.async {
//If you need to reload tableview or etc. do here
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54031942
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