ios – 在大量计算过程中如何让屏幕停止冻结？

概述好吧,我正在尝试做的是更改某个图像的像素数据.我想使用每次循环作为进度条时向右移动的UIView.然而,正在发生的事情是屏幕在计算过程中冻结,直到完成后才会发生任何事情.状态栏时钟也不会更新.有没有办法将这些计算以某种方式移动到背景并仍然使用屏幕空间？ func lock() { let lockView = UIImageView(image: self.photoBackgroun 好吧,我正在尝试做的是更改某个图像的像素数据.我想使用每次循环作为进度条时向右移动的UIVIEw.然而,正在发生的事情是屏幕在计算过程中冻结,直到完成后才会发生任何事情.状态栏时钟也不会更新.有没有办法将这些计算以某种方式移动到背景并仍然使用屏幕空间？

func lock() {    let lockVIEw =  UIImageVIEw(image: self.photoBackgroundVIEw.image!)    var progressbar = UIVIEw(frame: CGRectMake(-self.vIEw.wIDth,self.vIEw.wIDth,20)    let increment = progressbar.wIDth/self.photoBackgroundVIEw.wIDth    var password = self.textFIEld.text!    if password == "" {        password = " "    }    var currentIndex = 0    let imageRect = CGRectMake(0,self.photoBackgroundVIEw.image!.size.wIDth,self.photoBackgroundVIEw.image!.size.height)    UIGraphicsBeginImageContext(self.photoBackgroundVIEw.image!.size)    let context = UIGraphicsGetCurrentContext()    CGContextSaveGState(context)    CGContextDrawImage(context,imageRect,self.photoBackgroundVIEw.image!.CGImage)    for x in 0...Int(self.photoBackgroundVIEw.image!.size.wIDth) {        print(x)        progressbar.frame.origin.x += (CGfloat(x) * increment)        self.vIEw.addSubVIEw(progressbar)        for y in 0...Int(self.photoBackgroundVIEw.image!.size.height) {            let pointcolor = lockVIEw.layer.colorOfPoint(CGPoint(x: x,y: y))            if currentIndex == Array(password.characters).count {                currentIndex = 0            }            let red = encrypt(pointcolor.components.red,passwordChar: Array(password.characters)[currentIndex],currentIndex: currentIndex,x: x,y: y)            currentIndex++            if currentIndex == Array(password.characters).count {                currentIndex = 0            }            let green = encrypt(pointcolor.components.green,y: y)            currentIndex++            if currentIndex == Array(password.characters).count {                currentIndex = 0            }            let blue = encrypt(pointcolor.components.blue,y: y)            currentIndex++            CGContextSetRGBFillcolor(context,red,green,blue,pointcolor.components.Alpha)            CGContextFillRect(context,CGRectMake(CGfloat(x),CGfloat(y),1,1))        }    }    CGContextRestoreGState(context)    let newImage = UIGraphicsGetimageFromCurrentimageContext()    self.photoBackgroundVIEw.image = newImage    self.slIDeVIEw.addSubvIEw(photoBackgroundVIEw)    self.vIEw.addSubvIEw(self.slIDeVIEw)}

解决方法 您可以在 background thread中进行这些计算.

斯威夫特2：

let priority = disPATCH_QUEUE_PRIORITY_DEFAulTdispatch_async(dispatch_get_global_queue(priority,0)) {    // Put the calculations here    dispatch_async(dispatch_get_main_queue()) {        // any updates of the UI need to be here to do them in the main thread after your background task. For example adding subvIEws    }}

斯威夫特3：

见this answer

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