活动指示器不旋转 [英] Activity Indicator doesn't spin

问题描述

我正在尝试添加一个旋转活动指示器（UIActivityIndi​​catorView）到我的应用程序，当它解析来自互联网的数据。我有一个IBOutlet（微调）连接到IB中的UIActivityIndi​​catorView。最初，我设置为这样：

I'm trying to add a spinning activity indicator (UIActivityIndicatorView) to my app while it parses data from the internet. I have an IBOutlet (spinner) connected to a UIActivityIndicatorView in IB. Initially I had it set up like this:

-

 (void) function {
        self.spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhite];
 self.spinner.hidesWhenStopped = YES;
 [spinner startAnimating];
 //parse data from internet
 [spinner stopAnimating];}

旋转器不会旋转。我读到它与一切都在同一个线程有关。所以我尝试这个：

But the spinner wouldn't spin. I read that it had something to do with everything being on the same thread. So I tried this:

    - (void) newFunction {
        self.spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleWhite];
 self.spinner.hidesWhenStopped = YES;
 [spinner startAnimating];
 [NSThread detachNewThreadSelector: @selector(function) toTarget: self withObject: nil];
 [spinner stopAnimating];}

但是没有运气。有任何想法吗？感谢。

But still no luck. Any ideas? Thanks.

推荐答案

您的 newFunction：方法应如下所示： / p>

Your newFunction: method should look like this:

- (void) newFunction {
   self.spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
   self.spinner.hidesWhenStopped = YES;
   [NSThread detachNewThreadSelector: @selector(function) toTarget: self withObject: nil];
}

您的函数方法应该是这样：

- (void) function {
   NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
   [self.spinner performSelectorOnMainThread:@selector(startAnimating) withObject:nil waitUntilDone:NO];

   //...

   [self.spinner performSelectorOnMainThread:@selector(stopAnimating) withObject:nil waitUntilDone:NO];
   [pool drain];
}

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