NStimer 在滚动ScrollView的时候停止,在新线程中使用NSTimer

方法一：

-(void) viewDidLoad{

[self performSelectorInBackground:@selector(call1) withObject:nil];

}

-(void) call1{

timer1 = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(doSomething) userInfo:nil repeats:NO];

[[NSRunLoop currentRunLoop] addTimer:timer1 forMode:NSRunLoopCommonModes];

}

-(void) call2{

// do something

timer1 invalidate];

timer1 = nil;

}

方法二：

- (void)viewDidAppear:(BOOL)animated {
NSThread* timerThread = [[NSThread alloc] initWithTarget:self selector:@selector(timerStart) object:nil];
[timerThread start];
}

-(void)timerStart
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSRunLoop* runLoop = [NSRunLoop currentRunLoop];
timer = [[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(method) userInfo:nil repeats:YES] retain];//一定要retain，不然timerStart执行完后，NSTimer就被释放了。
[runLoop run];
[pool release];
}

- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
[timer invalidate];
}

方法三：

timer = [NSTimer timerWithTimeInterval:5.0 target:self selector:@selector(SendHeartBeat) userInfo:nil repeats:YES];

[[NSRunLoop mainRunLoop] addTimer:heartTimer forMode:NSDefaultRunLoopMode];