A setTimeout script for Swift3.0

Basic.swift

/**
 setTimeout() 
 
 Shorthand method for create a delayed block to be execute on started Thread.
 
 This method returns ``Timer`` instance, so that user may execute the block
 within immediately or keep the reference for further cancelation by calling
 ``Timer.invalidate()``
 
 Example:
    let timer = setTimeout(0.3) {
        // do something
    }
    timer.invalidate()      // cancel it.
 */
func setTimeout(_ delay:TimeInterval, block:@escaping ()->Void) -> Timer {
    return Timer.scheduledTimer(timeInterval: delay, target: BlockOperation(block: block), selector: #selector(Operation.main), userInfo: nil, repeats: false)
}

/**
 setInternval()
 
 Similar to setTimeout() this method will return ``Timer`` instance however, this
 method will execute repeatedly.
 
 Warning using this method with caution, it is recommended that the block to utilise
 this method should call [unowned self] or [weak self] to announce OS that it should not 
 hold strong reference to this block.
 
 In addition, ``Timer`` returned should kept as member variable, and call invalidated()
 when the block no longer required. such as deinit, or viewDidDisappear()
 */
func setInterval(_ interval:TimeInterval, block:@escaping ()->Void) -> Timer {
    return Timer.scheduledTimer(timeInterval: interval, target: BlockOperation(block: block), selector: #selector(Operation.main), userInfo: nil, repeats: true)
}