问题描述
下面的函数每3秒调用一次,如下所示:
func fetchItems(){
let url = URL(string: itemUrl)!
var request = URLRequest(url: url)
request.httpMethod = "GET"
request.addValue("Item \(self.item)",forHTTPHeaderField: "Authorization")
let task = URLSession.shared.dataTask(with: request,completionHandler: parseJasonObject)
task.resume()
}
func parseJasonObject(data: Data?,urlResponse: URLResponse?,error: Error?){
guard error == nil else {
print("error: \(error!)")
return
}
guard let content = data else{
print("No data")
return
}
if let decodedResponse = try? JSONDecoder().decode([itemdata]?.self,from: content) {
// we have good data – go back to the main thread
DispatchQueue.main.async {
self.items = decodedResponse
self.dataHasLoaded = true // state variable that determines whether or not data has been loaded
}
}
}
如果我注释了request.addValue()行,它将导致日历不会出现奇怪的故障,如果您将日历导航到新的月份或其他日期,则在运行上述功能时,它将日历还原为它是开始屏幕(显示当前日期)。日历如下:
@State private var selectedStartTime = Date()
let timer = Timer.publish(every: 3,on: .main,in: .common).autoconnect()
HStack {
Spacer()
DatePicker("",selection: self.$selectedStartTime,in: Date()...) //where self.$selectedStartTime is just a variable that is defined by the date/time the user selected
.datePickerStyle(GraphicalDatePickerStyle())
Spacer()
}
https://www.youtube.com/watch?v=ns9XXgrmiZk
如您所见,如果我去另一个月而不选择该月中的日期,则当fetchEvents()函数运行时-它在onReceive中每3秒运行一次-导致日历返回到当前选定的日期。如果我在其他月份选择新的一天,则这不是问题。任何帮助将不胜感激。
解决方法
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