GCDTimer

An implementaiton of timer which supports GCD queue with some practical features such as

• fire and invalidatein
• pause
• resume
• remaining time

in Objective-C and Swift.

Why we use GCDTimer

• We love Grand Central Dispatch!.
• Apple has not announced any APIs for NSTimer/Timer which supports GCD properly.
• The API for using NSTimer/Timer which supports block/clousre just work for iOS 10+. It means we have to handle the iOS versions programatically and choose a proper way to use NSTimer/Timer.
• NSTimer retain cycle issue, NSTimer will maintain a strong reference to the target, which can cause (especially in repeating timers) strong reference cycles (a.k.a. retain cycles)

Requirements

• iOS 7.0+
• Swift 4.0+
• Objective-C

How to use

Create an GCDTimer object with the init method in Objective-C:

GCDTimer *timer =  [[GCDTimer alloc] initWithTimeout:2.0 repeat:true completion:^{
        <#code#>
    } queue:dispatch_get_main_queue()]

in Swift:

let timer = GCDTimer(timeout: 2.0, repeat: true, completion: {
            <#code#>
        }, queue: DispatchQueue.main)

Please Check out the code in the test targets for more.