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DEMRUM-620: Add exercise of slow frame detection to test app (#236)
* DEMRUM-620: Add exercise of slow frame detection to test app * DEMRUM-620: swiftlint: fix trailing spaces * DEMRUM-620: fix typos * DEMRUM-620: swiftlint: remove weak from IBOutlet * DEMRUM-620: swiftlint: remove needless self references and fix whitespace * DEMRUM-620: swiftlint: sort imports alphabetically * DEMRUM-620: swiftlint: remove weak from IBOutlet
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84 changes: 84 additions & 0 deletions
84
AgentTestApp/AgentTestApp/Features/SlowFrameBeatingHeartView.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| // | ||
| // MRUM SDK, © 2024 CISCO | ||
| // | ||
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| import UIKit | ||
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| class SlowFrameBeatingHeartView: UIView { | ||
| private let heartImageView = UIImageView() | ||
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| // manual animation -- see below for why | ||
| private var timer: Timer? | ||
| private var scaleDirection: CGFloat = -1.0 | ||
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| override init(frame: CGRect) { | ||
| super.init(frame: frame) | ||
| setupView() | ||
| startAnimation() | ||
| } | ||
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| required init?(coder: NSCoder) { | ||
| super.init(coder: coder) | ||
| setupView() | ||
| startAnimation() | ||
| } | ||
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| func dealloc() { | ||
| stopAnimation() | ||
| } | ||
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| override func layoutSubviews() { | ||
| super.layoutSubviews() | ||
| heartImageView.frame = bounds | ||
| } | ||
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| private func setupView() { | ||
| heartImageView.image = UIImage(systemName: "heart.fill") | ||
| heartImageView.tintColor = .red | ||
| heartImageView.contentMode = .scaleAspectFit | ||
| heartImageView.translatesAutoresizingMaskIntoConstraints = false | ||
| addSubview(heartImageView) | ||
| } | ||
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| func startAnimation() { | ||
| // Even with 0.04 it's still not the smoothest but | ||
| // it serves the purpose. | ||
| timer = Timer.scheduledTimer(withTimeInterval: 0.04, repeats: true) { [weak self] _ in | ||
| self?.updateAnimation() | ||
| } | ||
| } | ||
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| func stopAnimation() { | ||
| timer?.invalidate() | ||
| timer = nil | ||
| } | ||
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| private func updateAnimation() { | ||
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| // Use a manually conducted animation so that we can | ||
| // keep it on the main thread and witness the results of | ||
| // the main thread stall in the UI. If we instead used a | ||
| // built-in animation here, Apple would put it on a | ||
| // background worker thread and it would not (reliably) | ||
| // pause when the main thread pauses, such as during a | ||
| // sleep on the main thread, so the results would not | ||
| // be visible or clearly shown in this test app. | ||
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| // get the scale component of the transform matrix | ||
| let currentScale = heartImageView.transform.a | ||
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| let scaleStep: CGFloat = 0.01 | ||
| var newScale = currentScale + (scaleStep * scaleDirection) | ||
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| if newScale <= 0.5 { | ||
| newScale = 0.5 | ||
| scaleDirection = 1.0 | ||
| } else if newScale >= 1.0 { | ||
| newScale = 1.0 | ||
| scaleDirection = -1.0 | ||
| } | ||
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| heartImageView.transform = CGAffineTransform(scaleX: newScale, y: newScale) | ||
| } | ||
| } | ||
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35 changes: 35 additions & 0 deletions
35
AgentTestApp/AgentTestApp/Features/SlowFrameDetectorViewController.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // | ||
| // MRUM SDK, © 2024 CISCO | ||
| // | ||
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| import SwiftUI | ||
| import UIKit | ||
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| class SlowFrameDetectorViewController: UIViewController { | ||
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| @IBOutlet var slowFramesButton: UIButton! | ||
| @IBOutlet var frozenFramesButton: UIButton! | ||
| @IBOutlet var beatingHeartView: SlowFrameBeatingHeartView! | ||
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| override func viewDidLoad() { | ||
| super.viewDidLoad() | ||
| } | ||
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| @IBAction func slowFramesClick(_ sender: UIButton) { | ||
| // Sleep for 0.5 seconds on the main thread | ||
| print("Sleeping for 0.5 seconds to force slow frames") | ||
| DispatchQueue.main.asyncAfter(deadline: .now() + 0.001) { | ||
| Thread.sleep(forTimeInterval: 0.5) | ||
| } | ||
| } | ||
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| @IBAction func frozenFramesClick(_ sender: UIButton) { | ||
| // Sleep for 1 second on the main thread | ||
| print("Sleeping for 2 seconds to force frozen frames") | ||
| DispatchQueue.main.asyncAfter(deadline: .now() + 0.001) { | ||
| Thread.sleep(forTimeInterval: 2.0) | ||
| } | ||
| } | ||
| } | ||
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