UIActivityView 和阻塞
我有一段上传图像的代码：
[activity startAnimating];
[self uploadImage:img Session_id:appDelegate.sessionID PlaceID:place.placeID Comment:comment.text];
[activity stopAnimating];
我确信该活动已正确连接到 UIActivityViewIndicator，但它从未显示。在 uploadImage 函数中，我打开与服务器的连接并开始上传。有人有关于为什么活动视图不显示的示例或可能的解释吗？
I have a section of code that uploads an image:
[activity startAnimating];
[self uploadImage:img Session_id:appDelegate.sessionID PlaceID:place.placeID Comment:comment.text];
[activity stopAnimating];
I am sure that activity is wired up correctly to a UIActivityViewIndicator, but it never shows. Inside the uploadImage function, I open a connection to the server and start the upload. Does anyone have an example or possible explanation as to why the activity view would not display?
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如果您在主线程上进行上传，那么它会被阻止并且 UI 无法更新。
我建议在后台线程上运行它。
If you're doing the upload on the main thread, then it's blocked and the UI cannot be updated.
I would suggest running it on a background thread.