ios - 写入 NSOutputStream 会导致 CPU 使用率过高

Question

在检测我的应用程序时，我发现将数据写入输出流时 CPU 使用率跃升至 90%。具体来说，当网络速度非常高时。当我使用 Timer 工具对其进行分析时，发现大部分 cpu 用于 NSStream 委托调用。请帮助优化写作技术以降低 CPU 使用率。

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
switch (eventCode) {

    case NSStreamEventOpenCompleted: {
        _isConnected = YES;
        if([self.delegate respondsToSelector:@selector(isFTPConnectionFoundForUpload:)])
            [self.delegate performSelector:@selector(isFTPConnectionFoundForUpload:) withObject:_isConnected?@"YES":@"NO"];
    } break;

    case NSStreamEventHasSpaceAvailable: {

            bytesWritten = [self.producerStream write:&self.buffer[0] maxLength:512];
            if (bytesWritten == -1) {
                [self stopSendWithStatus:@"Network write error"];
            }

    } break;

    case NSStreamEventErrorOccurred: {
        NSLog(@"producer stream error %@", [aStream streamError]);
        [self stopSendWithStatus:@"Stream open error"];
    } break;
    case NSStreamEventEndEncountered: {

    } break;
    default: {

    } break;
}

}