Question

我已经启动了一个计时器，在10秒后调用一个方法。计时器从didFinishLaunchingWithOptions开始。它工作正常，但我想在注销时从另一个UISubclass停止该计时器。我怎么能这样做我的代码是

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{  
    [NSThread sleepForTimeInterval:2.0];

    [self.window addSubview:viewController.view];
    [self setupTimer];
    [self.window makeKeyAndVisible];

    return YES;
}
-(void)setupTimer;
{
    timer = [NSTimer timerWithTimeInterval:10 
                                    target:self
                                  selector:@selector(triggerTimer:)
                                  userInfo:nil
                                   repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
}

-(void)triggerTimer:(NSTimer*)timer;
{
    NSLog(@"===============this method is call after every 10            second===========================");
    Getlocation *object=[[Getlocation alloc] init];
    [object updatelocation];
}
  -(void)stopTimer:(NSTimer*)timer;
 {
   [timer invalidate];
   timer=nil;
 }

Answer 1

if([timer isValid])
     [timer invalidate];

timer = nil;

Answer 2

以NSTimer为对象将此行写在您想要调用方法

的位置

timer = [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(NEWTIMER) userInfo:nil repeats:YES];

将此代码写在那里你想要停止计时器。

[timer invalidate];
timer = nil;
[timer release];

如果您想在应用程序出现后台时停止计时器。您应该将此代码写入此方法。

- (void)applicationWillEnterForeground:(UIApplication *)application
{
   [timer invalidate];
   timer = nil;
   [timer release];
}

Answer 3

在注销ButtonAction方法中编写代码。

- （IBAction）LogOutButtonPressed：（id）sender {

[计时器无效]; timer = nil; [计时器发布];

}

从应用程序didFinishLaunchingWithOptions停止运行NSTimer

3 个答案: