XTimer
The role of XTimer and NSTimer is similar and it does not cause memory leaks; XTimer has three function,you can stop and reStart the XTimer;
How to use
timer = [XTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(XTimerSelector:) userInfo:@{@"key":@"value"} repeats:true];
stop timer
[timer stop];
reStart timer
[timer reStart];
invalidate timer
[timer invalidate];