我正在使用
Swift中的ProgressView
这是我的代码
var request = HTTPTask()
let downloadTask = request.download(urlm!,parameters: nil,progress: {(complete: Double) in
println("percent complete: \(Float(complete))")
self.Progress.setProgress(Float(complete),animated: true)
即使完整提供此输出
percent complete: 0.00480848 percent complete: 0.0089619 percent complete: 0.0132512 percent complete: 0.0175405 percent complete: 0.0221036 percent complete: 0.0264841 percent complete: 0.0308647 percent complete: 0.0350627 percent complete: 0.0392608 percent complete: 0.0434588 percent complete: 0.0513073 percent complete: 0.0555054 percent complete: 0.0598859 percent complete: 0.0642665 percent complete: 0.0688296 percent complete: 0.0731189 percent complete: 0.0774994 percent complete: 0.0817887 percent complete: 0.0861693 percent complete: 0.0908237 percent complete: 0.095478 percent complete: 0.099676 percent complete: 0.104057 percent complete: 0.109624 percent complete: 0.114278 percent complete: 0.119024 percent complete: 0.123404 percent complete: 0.127602 percent complete: 0.131983 percent complete: 0.136181 percent complete: 0.136408 percent complete: 0.140561 percent complete: 0.144759 percent complete: 0.148957 percent complete: 0.153155 percent complete: 0.157901 percent complete: 0.162282 percent complete: 0.166662 percent complete: 0.171043 percent complete: 0.175241 percent complete: 0.175468 percent complete: 0.179621 percent complete: 0.184002 percent complete: 0.188291 percent complete: 0.192672 percent complete: 0.197052 percent complete: 0.201524 percent complete: 0.205905 percent complete: 0.210285 percent complete: 0.21494 percent complete: 0.215258 ... percent complete: 1.0
它不会在此更新进度视图
self.Progress.setProgress(Float(complete),animated: true)
解决方法
针对Swift 3进行了更新
对UI的更改应始终发生在主/前台线程上,在这种情况下,它发生在后台队列上.使用：
DispatchQueue.main.async {
self.Progress.setProgress(Float(complete),animated: true)
}
把它移到前台.
前Swift 3的旧答案
对UI的更改应始终发生在主/前台线程上,它发生在后台队列上.使用：
dispatch_async(dispatch_get_main_queue()) {
self.Progress.setProgress(Float(complete),animated: true)
}
把它移到前台.
