Swift获取当前页面帧数值FPS，判断当前页面流畅程度。

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Swift获取当前页面帧数值FPS，判断当前页面流畅程度。

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代码

//

// V2FPSLabel.swift

// V2ex-Swift

//

// Created by huangfeng on 1/15/16.

// Copyright © 2016 Fin. All rights reserved.

//

import UIKit

//重写自 YYFPSLabel 

//https://github.com/ibireme/YYText/blob/master/Demo/YYTextDemo/YYFPSLabel.m

class V2FPSLabel: UILabel {

private var _link :CADisplayLink?

private var _count:Int = 0

private var _lastTime:NSTimeInterval = 0

private let _defaultSize = CGSizeMake(55, 20);

override init(frame: CGRect) {

var targetFrame = frame

if frame.size.width == 0 && frame.size.height == 0{

targetFrame.size = _defaultSize

}

super.init(frame: targetFrame)

self.layer.cornerRadius = 5

self.clipsToBounds = true

self.textAlignment = .Center

self.userInteractionEnabled = false

self.textColor = UIColor.whiteColor()

self.backgroundColor = UIColor(white: 0, alpha: 0.7)

self.font = UIFont(name: "Menlo", size: 14)

weak var weakSelf = self

_link = CADisplayLink(target: weakSelf!, selector:#selector(V2FPSLabel.tick(_:)) );

_link!.addToRunLoop(NSRunLoop .mainRunLoop(), forMode:NSRunLoopCommonModes)

}

required init?(coder aDecoder: NSCoder) {

super.init(coder: aDecoder)

}

func tick(link:CADisplayLink) {

if _lastTime == 0 {

_lastTime = link.timestamp

return

}

_count += 1

let delta = link.timestamp - _lastTime

if delta < 1 {

return

}

_lastTime = link.timestamp

let fps = Double(_count) / delta

_count = 0

let progress = fps / 60.0;

self.textColor = UIColor(hue: CGFloat(0.27 * ( progress - 0.2 )) , saturation: 1, brightness: 0.9, alpha: 1)

self.text = "\(Int(fps+0.5))FPS"

}

}