无限期地保持包含NSTimer的NSThread吗? (苹果手机) [英] Keep an NSThread containing an NSTimer around indefinitely? (iPhone)
问题描述
我的应用程序中有一些Web服务数据，需要每3分钟更新一次. 我已经尝试了几种方法，但是上周在这里得到了很好的建议，我不应该每3分钟构建一个新线程，然后再尝试重新分配并同步所有不同的部分，从而避免出现内存错误.相反，我应该有一个始终在运行的工作线程"，但也只有在我询问时(每3分钟)才进行实际工作.
I have some web service data in my app that needs to be updated every 3 minutes. I had tried out a few approaches but got a really good piece of advise in here last week, I should not build a new thread every 3 minutes and then subsequently try and dealloc and synchronize all the different parts so that I avoided memory bug. Instead I should have a "worker thread" that was always running, but only did actual work when I asked it too (every 3 minutes).
当我的小型POC现在可以工作时，我在applicationDidFinishLaunching中产生了一个新线程
方法.我这样做是这样的:
As my small POC works now, I spawn a new thread in the applicationDidFinishLaunching
method. I do this like so:
[NSThread detachNewThreadSelector:@selector(updateModel) toTarget:self withObject:nil];
- (void) updateModel {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
BackgroundUpdate *update = [[BackgroundUpdate alloc] initWithTimerInterval:180];
[update release];
[pool release];
}
好的，这会以更新间隔(以秒为单位)启动"BackgroundUpdate"对象.在更新程序内部，现在就像这样:
Ok, this inits the "BackgroundUpdate" object with the update interval in seconds. Inside the updater it is simply like this for now:
@implementation BackgroundUpdate
- (id) initWithTimerInterval:(NSInteger) secondsBetweenUpdates {
if(self = [super init]) {
[NSTimer scheduledTimerWithTimeInterval:secondsBetweenUpdates
target:self
selector:@selector(testIfUpdateNeeded)
userInfo:nil
repeats:YES];
}
return self;
}
- (void) testIfUpdateNeeded {
NSLog(@"Im contemplating an update...");
}
我以前从未使用过这样的线程.我一直以来都是设置autoReleasePool，做好工作，耗尽autoReleasePool，然后再见".
I have never used threads like this before. I has always been "setup autoReleasePool, do work, get your autoReleasePool drained, and goodbye".
我的问题是initWithTimerInterval一旦运行，NSThread就完成了，因此它返回到updateModel方法并耗尽了其池.我想这与NSTimer具有自己的线程/运行循环有关吗?我希望线程保持每3分钟运行一次testIfUpdateNeeded方法.
My problem is that as soon as the initWithTimerInterval has run, the NSThread is done, it therefore returns to the updateModel method and has its pool drained. I guess it has to do with the NSTimer having it's own thread/runloop? I would like for the thread to keep having the testIfUpdateNeeded method run every 3 minutes.
那我如何在应用程序的整个过程中保持该NSThread的生命力?
感谢您提供的任何帮助/建议:)
Thank You for any help/advice given:)
推荐答案
您已经关闭.现在您需要做的就是启动运行循环运行，这样线程就不会退出并且计时器会运行.调用initWithTimerInterval:之后，只需调用
You're close. All you need to do now is start the run loop running so the thread doesn't exit and the timer runs. After your call to initWithTimerInterval:, just call
[[NSRunLoop currentRunLoop] run];
该线程将无限期地运行其运行循环，您的计时器将正常工作.
The thread will run its run loop indefinitely and your timer will work.
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