問題描述

我有一個(gè)問題，我試圖在用戶在 UIScrollView 周圍移動(dòng)時(shí)在后臺(tái)加載聲音文件...問題是我正在使用 NSURLRequest 所以我可以在后臺(tái)加載，但即使這樣它也拒絕實(shí)際加載直到 UIScrollView 停止?jié)L動(dòng).:(

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. :(

對(duì)此我有什么辦法嗎?

謝謝！

推薦答案

NSURLRequest 只管理請(qǐng)求，不管理實(shí)際連接.

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

滾動(dòng)等觸摸事件會(huì)將運(yùn)行循環(huán)置于NSEventTrackingRunLoopMode.默認(rèn)情況下，NSURLConnection 被調(diào)度為僅 在 NSDefaultRunLoopMode 中執(zhí)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.

好消息是您可以為 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];

這篇關(guān)于NSURLRequest 在 UIScrollView 滾動(dòng)時(shí)不會(huì)觸發(fā)的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！