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ART001-DroppingFramesHelper.swift
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class DroppingFramesHelper: NSObject { | |
private var firstTime: TimeInterval = 0.0 | |
private var lastTime: TimeInterval = 0.0 | |
func activate() { | |
let link = CADisplayLink(target: self, selector: #selector(update(link:))) | |
link.add(to: .main, forMode: .commonModes) | |
} | |
@objc private func update(link: CADisplayLink) { | |
if lastTime == 0 { | |
firstTime = link.timestamp | |
lastTime = link.timestamp | |
} | |
let currentTime = link.timestamp | |
let elapsedTime = floor((currentTime - lastTime) * 10_000)/10 | |
let totalElapsedTime = currentTime - firstTime | |
if elapsedTime > 16.7 { | |
print("[DFH] Frame was dropped with elpased time of \(elapsedTime)ms at \(totalElapsedTime)") | |
} | |
lastTime = link.timestamp | |
} | |
} |
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