NSDate *scheduledTime = [NSDate dateWithTimeIntervalSinceNow:0.0];
timer = [[NSTimer alloc] initWithFireDate:scheduledTime
interval:2
target:self
selector:@selector(task)
userInfo:@"dd"
repeats:YES];
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addTimer:timer forMode:NSDefaultRunLoopMode];
