NSURLRequest 在 UIScrollView 滚动时不会触发

问题描述

我有一个问题，我试图在用户在 UIScrollView 周围移动时在后台加载声音文件...问题是我正在使用 NSURLRequest 所以我可以在后台加载，但即使这样它也拒绝实际加载直到 UIScrollView 停止滚动.:(

I have a problem in that I am trying to background load a sound file while the user moves around a UIScrollView... The problem is that I am using NSURLRequest so I can load in the background, but even then it refuses to actually load until the UIScrollView has stopped scrolling. :(

对此我有什么办法吗?

谢谢！

推荐答案

NSURLRequest 只管理请求，不管理实际连接.

The NSURLRequest only manages the request, not the actual connection.

滚动等触摸事件会将运行循环置于NSEventTrackingRunLoopMode.默认情况下，NSURLConnection 被调度为仅 在 NSDefaultRunLoopMode 中执行.所以在 NSEventTrackingRunLoopMode 中，NSDefaultRunLoopMode 被阻塞了.

Touch events such as scrolling will place the run loop into NSEventTrackingRunLoopMode. By default, an NSURLConnection is scheduled to only execute in NSDefaultRunLoopMode. So while in NSEventTrackingRunLoopMode, NSDefaultRunLoopMode is blocked.

好消息是您可以为 NSURLConnection 安排其他模式，例如 NSRunLoopCommonModes.

Good news is that you can schedule additional modes for an NSURLConnection, such as NSRunLoopCommonModes.

connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
[connection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
[connection start];

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