Question

我只是想在几秒钟的延迟后关闭一个NSPanel，但我无法启动我的NSTimer。如果我在其上显式调用fire方法，它将会触发，但它永远不会自行运行。这是我的代码：

   - (void)startRemoveProgressTimer:(NSNotification *)notification {
    NSLog(@"timer should start");
    timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(removeProgress:) userInfo:nil repeats:NO];
}

- (void)removeProgress:(NSTimer *)timer {
    [progressPanel close];
}

我的代码中确实有一些线程。我认为这是弄乱我的计时器的原因。

-(void)incomingTextUpdateThread:(NSThread*)parentThread {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

//mark the thread as running
readThreadRunning = TRUE;

const int BUFFER_SIZE = 100;
char byte_buffer[BUFFER_SIZE]; //buffer for holding incoming data
int numBytes = 0; //number of bytes read
NSString *text; //incoming text from the serial port

[NSThread setThreadPriority:1.0];

//this will loop until the serial port closes
while (TRUE) {
    //read() blocks until some data is available or the port is closed
    numBytes = read(serialFileDescriptor, byte_buffer, BUFFER_SIZE);
    if(numBytes > 0) {
        //creat a string from the incoming bytes
        text = [[[NSString alloc] initWithBytes:byte_buffer length:numBytes encoding:[NSString defaultCStringEncoding]] autorelease];
        if(!([text rangeOfString:SEND_NEXT_COORDINATE].location == NSNotFound)) {
            //look for <next> to see if the next data should be sent
            if(coordinateNum <[coordinatesArray count]) {
                [self sendNextCoordinate]; //send coordinates
            }
            else {
                [self writeString:FINISH_COORDINATES_TRANSMIT]; //send <end> to mark transmission as complete
                NSNumber *total = [NSNumber numberWithUnsignedInteger:[coordinatesArray count]];
                NSDictionary *userInfo = [NSDictionary dictionaryWithObject:total forKey:@"progress"];
                [[NSNotificationCenter defaultCenter] postNotificationName:@"uploadProgressChange" object:self userInfo:userInfo]; //update progress bar to completed
            }


        }

        [self performSelectorOnMainThread:@selector(appendToIncomingText:) withObject:text waitUntilDone:YES]; //write incoming text to NSTextView
    } else {
        break; //Stop the thread if there is an error
    }
}

// make sure the serial port is closed
if (serialFileDescriptor != -1) {
    close(serialFileDescriptor);
    serialFileDescriptor = -1;
}

// mark that the thread has quit
readThreadRunning = FALSE;

// give back the pool
[pool release];
}

从另一种方法调用：[self performSelectorInBackground:@selector(incomingTextUpdateThread:) withObject:[NSThread currentThread]];

Answer 1

谢谢rgeorge !!

手动将计时器添加到运行循环中使其正常工作！

timer = [NSTimer timerWithTimeInterval:2.0 target:self selector:@selector(removeProgress:) userInfo:nil repeats:NO];
[[NSRunLoop mainRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

NSTimer永远不会开始

1 个答案: