Question

（void）URLSession：（NSURLSession *）session 任务：（NSURLSessionTask *）任务 didSendBodyData：（的int64_t）bytesSent totalBytesSent：（的int64_t）totalBytesSent totalBytesExpectedToSend：（的int64_t）totalBytesExpectedToSend { self.progress.completedUnitCount = totalBytesSent; ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^这个挂在ios 9.0上任何想法如何处理???
（void）URLSession：（NSURLSession *）会话任务：（NSURLSessionTask *）任务 didSendBodyData：（的int64_t）bytesSent totalBytesSent：（的int64_t）totalBytesSent totalBytesExpectedToSend：（的int64_t）totalBytesExpectedToSend;在主线程上调用而不是它应该重要

（lldb）bt * thread＃1：tid = 0xd6e1,0x00000001984a0c6c libsystem_kernel.dylib semaphore_wait_trap + 8, queue = 'com.apple.main-thread', activity = 'send control actions', 1 messages, stop reason = signal SIGSTOP * frame #0: 0x00000001984a0c6c libsystem_kernel.dylib semaphore_wait_trap + 8 帧＃1：0x000000019857a97c libsystem_platform.dylib _os_semaphore_wait + 24 frame #2: 0x00000001007bd428 libdispatch.dylib _ dispatch_barrier_sync_f_slow + 600 第3帧：0x00000001835af270基金会-[NSConcreteObservationBuffer _receiveBox:] + 248 frame #4: 0x00000001836180b0 Foundation _ NSKVO1AdaptorDeliver + 388 第5帧：0x0000000183617ea0基金会_NSKVO1AdaptorSlowDeliver + 264 frame #6: 0x0000000183523b84 Foundation - [NSKeyValueObservance observeValueForKeyPath：ofObject：change：context：] + 424 第7帧：0x00000001834ffdd4基金会NSKeyValueNotifyObserver + 304 frame #8: 0x00000001834ff8fc Foundation NSKeyValueDidChange + 404 帧＃9：0x00000001834ea114基金会-[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 120 frame #10: 0x000000018258fab0 CoreFoundation __ 53 - [__ NSArrayM enumerateObjectsWithOptions：usingBlock：] _ block_invoke + 132 帧＃11：0x000000018258f9a8 CoreFoundation -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 308 frame #12: 0x00000001836cc158 Foundation - [NSProgress _setValueForKeys：settingBlock：] + 600 帧＃13：0x00000001836cc87c基础`- [NSProgress setCompletedUnitCount：] + 124

PS：如果我避免将UIProgressView :: observedProgress设置为该NSProgress，它可以正常工作！？

Answer 1

忙着等待解决

-(void)showUploadingUI
{
myHardAssert([[NSThread currentThread] isMainThread], @"");
self.progressView.hidden = NO;
NSProgress *progress = urlsession.progress;
if( [self.progressView respondsToSelector:@selector(observedProgress)]) {
// this causes hang     self.progressView.observedProgress = progress;
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
    while(progress.completedUnitCount < progress.totalUnitCount) {
        dispatch_sync(dispatch_get_main_queue(), ^{
            self.progressView.progress = progress.fractionCompleted;
        });
        [NSThread sleepForTimeInterval:0.033];
    }
    dispatch_sync(dispatch_get_main_queue(), ^{
        self.progressView.progress = 1;
    });

...

副作用是对ios的向后兼容性＆lt; 9

Answer 2

男孩帮了我。递增Progress.completedUnitCount时我的应用程序冻结了。（在主线程上。）我假设这触发了一个setter，因为有副作用 - 移动进度条，这是完成它的全部原因。

我的Swift 4解决方案就是这样打电话：

DispatchQueue.global(qos: .utility).async {
    self._decompressionProgress.completedUnitCount += 1
}

我仍然不太明白为什么这样做......与许多事情不同。

NSProgress :: completedUnitCount setter挂起

2 个答案: