This is a helper class that allows you to easily execute a closure on a loop, at a certain rate, until you tell it to stop. It's is very useful for creating, for instance, quick sequential animations using UIKit. To better understand what this class does, run the sample project on the iPhone Simulator, then look at the source code.
Using this class is pretty simple and straight-forward. You just need to run the following code:
//-- Scheduling a loopable closure:
BlockLooper.executeBlockWithRate(0.5) {
// loop code goes here...
return true
}In the function call, rate corresponds to the NSTimeInterval value of the frequency in which the closure should be looped. In the sample above, the closure will be executed once, and then stop.
The closure signature is: () -> Bool , where the return value indicates if the loop should be interrupted. In the sample below, we are running the loop 10 times until it stops:
var loopI = 0
BlockLooper.executeBlockWithRate(0.5) {
println("Loop i: \(loopI)")
++loopI
return (loopI >= 10)
}You can also execute multiple loops at once.
To use this control, you can either copy the BlockLooper.swift file to your project (you can find it at the 'Source' folder of this project), or add the following pod to your Podfile, using CocoaPods 0.36 and up:
pod 'BlockLooper'
This component is available under MIT license.