How to stop NStimer event? [duplicate]

Question

@interface
    NSTimer *autoTimer;

@implementation

// Start timer
    autoTimer = [NSTimer scheduledTimerWithTimeInterval:(3.0)
        target:self 
        selector:@selector(autoTimerFired:) 
        userInfo:nil 
        repeats:YES];

// Stop timer:
    [autoTimer invalidate];
    autoTimer = nil;

First, you want to keep a pointer to the timer

self.packetTimer = [NSTimer timerWithTimeInterval:CONNECTION_TIMEOUT target:self selector:@selector(connectionTimeout:) userInfo:nil repeats:NO];
[[NSRunLoop currentRunLoop] addTimer:packetTimer forMode:NSDefaultRunLoopMode];

If somewhere else in your code you want to cancel it, just call:

[self.packetTimer invalidate];
self.packetTimer = nil;