NSTimer永远不会启动

我只是在几秒钟后关闭NSPanel，但我无法启动我的NSTimer。如果我明确地调用它的fire方法，它会启动，但它永远不会自行完成。这里是我的代码：NSTimer永远不会启动

- (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]; 
}

我确实在我的代码中有一些线程。我认为这是搞乱我的计时器了。

-(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]; 
}

从另一方法，通过调用：[self performSelectorInBackground:@selector(incomingTextUpdateThread:) withObject:[NSThread currentThread]];

来源

2011-02-06 strange quark

嗯......没有看到任何错误，但你为什么要传递currentThread作为withObject：参数？你似乎没有用这种方法，为什么不通过零？ – jakev

怀疑我有（只是怀疑，因为我看不到是什么调用startRemoveProgressTimer :) scheduledTimerWithTimeInterval将计时器添加到当前线程的运行循环，而不是主线程。如果你正在后台线程中创建你的定时器，它永远不会使用它的运行循环 - 如果只是从一个文件描述符的while（1）循环读取中坐下并旋转，说 - 运行循环永远不会有机会处理任何排队的定时器。试着明确地将它添加到主线程的运行循环中，看看会发生什么。 – rgeorge

如果我告诉你startRemoveProgressTimer：是否与NSNotification绑定，它会有所作为吗？至于为什么我在当前线程中传递，我不确定。我正在尝试将别人的代码调整到我的应用程序中。原始代码在这里：http：//arduino.cc/playground/Interfacing/Cocoa，但我必须做一些修改才能在（Snow）Leopard上编译它，并且我加入了一些我自己的逻辑。 –

谢谢rgeorge！

手动添加计时器到运行循环使其工作！

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

来源

2011-02-06 16:06:36

具体来说，将它添加到* main *（主线程）运行循环中。 'scheduledTimer ...'方法将计时器添加到运行循环中，但将它添加到当前（当前线程）的运行循环中。它也可以通过创建/调度计时器来完成主线程执行。 –

NSTimer永远不会启动

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