iOS应用程序在Xcode模拟器中运行良好,但速度很慢并且在设备上崩溃

概述我有一个在模拟器中正常运行的应用程序,但是当我在设备上运行时,应用程序运行缓慢并偶尔崩溃.特别是在点击tableview单元格并转换到新视图时会出现此问题.当点击一个单元格有一两秒或两个延迟时,新视图将以缓慢的延迟方式推送.这也是偶尔崩溃的地方. 该应用程序在设备上正常运行,直到最近添加了一些代码更改,这是我认为问题所在.我添加了包含可疑代码的整个viewDidLoad bellow(在代码中指出 我有一个在模拟器中正常运行的应用程序,但是当我在设备上运行时,应用程序运行缓慢并偶尔崩溃.特别是在点击tablevIEw单元格并转换到新视图时会出现此问题.当点击一个单元格有一两秒或两个延迟时,新视图将以缓慢的延迟方式推送.这也是偶尔崩溃的地方.

该应用程序在设备上正常运行,直到最近添加了一些代码更改,这是我认为问题所在.我添加了包含可疑代码的整个vIEwDIDLoad bellow(在代码中指出).

我注意到的另一件事是调试导航器中的cpu使用率大约为130％,而应用程序在设备上发生问题时在sim中运行.

overrIDe func vIEwDIDLoad() {    super.vIEwDIDLoad()    // screen size for collection vIEw cell    screenSize = UIScreen.mainScreen().bounds    screenWIDth = screenSize.wIDth    screenHeight = screenSize.height    dimVIEw.Alpha = 0    openingHoursVIEw.Alpha = 0    resDescriptionLabel.layer.bordercolor = UIcolor.blackcolor().CGcolor    resDescriptionLabel.layer.borderWIDth = 2    resDescriptionLabel.layer.cornerRadius = 4    //add logo to nav bar    let navbarlogo: UIImageVIEw = UIImageVIEw(frame: CGRectMake(0,120,36))    navbarlogo.image = UIImage(named: "logo")    self.navigationItem.TitleVIEw = navbarlogo    self.resImage.image = UIImage(named: "placeholder")    if let checkedUrl = NSURL(string: "http://staging.API.cheapeat.com.au/restaurants/\(self.venueID)/photo") {        downloadImage(checkedUrl)    }    self.resname.text = " " + self.venuename + " "    self.resAdd.text = " " + self.venueAdd + " "    self.resPhone.text = "\(self.venuePH)"    self.resPhoneNumber.text = self.venuePH    self.resWebText.text = "\(self.venueWeb)"    ///////////////////// new code starts here //////////////    var paragraphStyle = NSMutableParagraphStyle()    paragraphStyle.alignment = NSTextAlignment.JustifIEd    paragraphStyle.lineBreakMode = NSlineBreakMode.ByWorDWrapPing    var attributedString = NSAttributedString(string: self.venueInfo,attributes: [            NSParagraphStyleAttributename: paragraphStyle,NSBaselineOffsetAttributename: NSNumber(float: 0)        ])    self.resDescriptionLabel.attributedText = attributedString    aboutVenueLabelWIDthConstraint.constant = screenWIDth - 16    resDescriptionLabel.edgeInsets.left = 10    resDescriptionLabel.edgeInsets.top = 10    resDescriptionLabel.edgeInsets.right = 10    resDescriptionLabel.edgeInsets.bottom = 10    resDescriptionLabel.layoutIfNeeded()    backgroundImageHeightConstraint.constant = resDescriptionLabel.bounds.height + 130    // set content vIEw height i.e. scrollable area    // (dynamic height of label + combined height of all other content and contraints)    contentVIEwHeightConstraint.constant = resDescriptionLabel.bounds.height + 790    /////////////////// new code ends here ///////////////    self.displayMap(self.venueLat,lng: self.venueLng)    self.getArrayForCollection()    self.getArrayValues()    dispatch_async(dispatch_get_global_queue( disPATCH_QUEUE_PRIORITY_DEFAulT,0),{ () -> VoID in        self.getDataForNexttable()        })    mon.text = timeFormatting(openingHours,day: "Monday")    tue.text = timeFormatting(openingHours,day: "Tuesday")    wed.text = timeFormatting(openingHours,day: "Wednesday")    thu.text = timeFormatting(openingHours,day: "Thursday")    fri.text = timeFormatting(openingHours,day: "FrIDay")    sat.text = timeFormatting(openingHours,day: "Saturday")    sun.text = timeFormatting(openingHours,day: "Sunday")}

解决方法 我找到了罪魁祸首,事实证明它毕竟不在代码中.我在scrollVIEw中设置了一些背景图像,分辨率很高(5000×5000).他们绝对是在咀嚼内存(在调试器中达到400mb左右).我调整了图像大小,问题解决了. 总结

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