表格视图卡住了很多
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【中文标题】表格视图卡住了很多【英文标题】:Table view stucking a lot 【发布时间】:2018-06-11 11:58:35 【问题描述】:我使用tableView
仅显示文本。在单元格内,我使用的是具有动态高度的UITextView
和带有转换为attributedString
的html 文本的linkDetection
。
我正在将 html 文本解析为 model
类中的属性文本:
if let nodeValue = dict["blurb_link"]
blurb_link = nodeValue as? String
let attrString = NSMutableAttributedString(attributedString: (blurb_link?.html2AttributedString)!)
atr_blurb_link = attrString
extension
中的String
中的html2AttributedString
从 html 文本返回 attributedString
。
我正在通过以下方式将我的单元格填充到单元格子类中,
textViewBlurbLink.attributedText = model.atr_blurb_link
但是正在发生的问题是,每当加载一个新单元格时,tableview 会卡住几分之一秒,这使得tableView
滚动有点生涩并对用户造成干扰。
单元格内没有图像,没有视频,没有繁重的任务,可能会导致滚动不顺畅。请告诉我这种生涩和打嗝的滚动可能是什么原因?
编辑:
我的单元格的布局是:
得到回复后,我在下面填充了 tableView:
TSNetworkManager.getDataFor(Request: dataRequest, success: response in
//print(response.responseObject!)
let model = TSLatestModel.init(WithDictionary: response.responseObject as? [String : Any])
completion(model)
tblLatest.reloadData()
, failure: error in
onError(error)
)
在cellForRowAtIndexPath
内部
let modelLatestDetails = model?.data![indexPath.section].items![indexPath.row]
cell.setupCellData(model: modelLatestDetails!)
在tableViewCell
子类的setupCellData
内,我将文本设置为textView
。
EDIT2:
这是我的 model class
的总代码库
class TSLatestModel: TSModelBase
var data : [LatestListModel]?
override init(WithDictionary dictionary: [String : Any]?)
super.init(WithDictionary: dictionary)
if let dict = dictionary
if let nodeValue = dict["data"]
data = [LatestListModel]()
for latest in nodeValue as! [Any]
let model = LatestListModel.init(WithDictionary: latest as? [String:Any])
data?.append(model)
class LatestListModel: NSObject
var storyname : String?
var main_title : String?
var color : String?
var issuedate : String?
var formatted_issue_date : String?
var id : String?
var cat_name : String?
var cat_id : String?
var order : Int?
var items : [TSLatestDetailsModel]?
var itemsModified : [TSLatestDetailsModel]?
init(WithDictionary dictionary: [String : Any]?)
super.init()
if let dict = dictionary
if let nodeValue = dict["items"]
items = [TSLatestDetailsModel]()
itemsModified = [TSLatestDetailsModel]()
for item in nodeValue as! [Any]
let model = TSLatestDetailsModel.init(WithDictionary: item as? [String : Any])
items?.append(model)
if !((item as! [String : Any])["one_liner"] as! String).isEmpty
let filteredArray = itemsModified?.filter($0.one_liner == ((item as! [String : Any])["one_liner"] as! String))
if filteredArray?.count == 0
let model = TSLatestDetailsModel.init(WithDictionary: item as? [String : Any])
itemsModified?.append(model)
if let nodeValue = dict["item_list"]
items = [TSLatestDetailsModel]()
itemsModified = [TSLatestDetailsModel]()
for item in nodeValue as! [Any]
let model = TSLatestDetailsModel.init(WithDictionary: item as? [String : Any])
items?.append(model)
if !((item as! [String : Any])["one_liner"] as! String).isEmpty
let filteredArray = itemsModified?.filter($0.one_liner == ((item as! [String : Any])["one_liner"] as! String))
if filteredArray?.count == 0
let model = TSLatestDetailsModel.init(WithDictionary: item as? [String : Any])
itemsModified?.append(model)
if let nodeValue = dict["_id"]
storyname = nodeValue as? String
if let nodeValue = dict["order"]
order = nodeValue as? Int
if let nodeValue = dict["category"]
cat_id = (nodeValue as! [Any])[0] as? String
if let dictStoryType = dict["_id"] as? [String : Any]
if let nodeValue = dictStoryType["issuedate"]
issuedate = nodeValue as? String
if let nodeValue = dictStoryType["formated_issue_date_title"]
formatted_issue_date = nodeValue as? String
if let nodeValue = dictStoryType["id"]
id = nodeValue as? String
if let nodeValue = dictStoryType["category_name"]
cat_name = nodeValue as? String
if let nodeValue = dict["name"]
storyname = nodeValue as? String
if let nodeValue = dict["story"]
storyname = nodeValue as? String
if let nodeValue = dict["main_title"]
main_title = nodeValue as? String
if let nodeValue = dict["color"]
color = nodeValue as? String
class TSLatestDetailsModel: NSObject
var __v : Int?
var _id : String?
var title : String?
var topic_key : String?
var blurb : String?
var blurb_link : String?
var atr_blurb_link : NSMutableAttributedString?
var formated_issue_date : String?
var formated_issue_date_item : String?
var formated_issue_date_title : String?
var issue_link : String?
var issue_title : String?
var issue_date : String?
var one_liner : String?
var main_title : String?
var source : String?
var source_link : String?
var isActive : Bool?
var isDeleted : Bool?
var isfavourite : Bool?
var story_order_number : Int?
var story_type : String?
var categories : [String]?
var story_type_model : TSStoryTypeDetailsModel?
var favourite_category_id : String?
init(WithDictionary dictionary: [String : Any]?)
super.init()
if let dict = dictionary
if let nodeValue = dict["__v"]
__v = nodeValue as? Int
if let nodeValue = dict["_id"]
_id = nodeValue as? String
if let nodeValue = dict["title"]
title = nodeValue as? String
if let nodeValue = dict["topic_key"]
topic_key = nodeValue as? String
if let nodeValue = dict["blurb"]
blurb = nodeValue as? String
if let nodeValue = dict["blurb_link"]
blurb_link = nodeValue as? String
let attrString = NSMutableAttributedString(attributedString: (blurb_link?.html2AttributedString)!)
atr_blurb_link = attrString
if let nodeValue = dict["formated_issue_date"]
formated_issue_date = nodeValue as? String
if let nodeValue = dict["issue_date"]
issue_date = nodeValue as? String
if let nodeValue = dict["issue_link"]
issue_link = nodeValue as? String
if let nodeValue = dict["issue_title"]
issue_title = nodeValue as? String
if let nodeValue = dict["one_liner"]
one_liner = nodeValue as? String
if let nodeValue = dict["main_title"]
main_title = nodeValue as? String
if let nodeValue = dict["source"]
source = nodeValue as? String
if let nodeValue = dict["source_link"]
source_link = nodeValue as? String
if let nodeValue = dict["isActive"]
isActive = nodeValue as? Bool
if let nodeValue = dict["isfavourite"]
isfavourite = nodeValue as? Bool
if let nodeValue = dict["story_order_number"]
story_order_number = nodeValue as? Int
if let nodeValue = dict["story_type"]
story_type = nodeValue as? String
if let nodeValue = dict["formated_issue_date_title"]
formated_issue_date_title = nodeValue as? String
if let nodeValue = dict["formated_issue_date_item"]
formated_issue_date_item = nodeValue as? String
if let nodeValue = dict["favourite_category_ids"]
if (nodeValue as! [String]).count > 0
favourite_category_id = (nodeValue as! [String])[0]
if let nodeValue = dict["story_type"]
let model = TSStoryTypeDetailsModel.init(WithDictionary: nodeValue as? [String : Any])
story_type_model = model
if let nodeValue = dict["category"]
categories = [String]()
for category in nodeValue as! [String]
categories?.append(category)
cellForRowAtIndexPath
:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
let cell = tableView.dequeueReusableCell(withIdentifier: "TSArchiveDetailsCell") as! TSArchiveDetailsCell
cell.delegate = self
if !((favoriteDetilsModel?.data![indexPath.section].items![indexPath.row].source!.isEmpty)!)
cell.viewFav.isHidden = false
else
if favoriteDetilsModel?.data![indexPath.section].storyname?.lowercased() == "brush up"
cell.viewFav.isHidden = false
else
cell.viewFav.isHidden = true
if isSayItOnRounds
let modelLatestDetails = favoriteDetilsModel?.data![indexPath.section].items?.filter($0._id! == selectedItemId)[0]
cell.setupCellData(model: modelLatestDetails!)
else if isBrushUp
let thirdBrushUpItemModel = favoriteDetilsModel?.data![indexPath.section].items![2]
if thirdBrushUpItemModel?._id == selectedItemId
let modelLatestDetails = favoriteDetilsModel?.data![indexPath.section].items?.filter($0._id == selectedItemId)
cell.setupCellData(model: modelLatestDetails![0])
else
let modelLatestDetails = favoriteDetilsModel?.data![indexPath.section].items![indexPath.row]
cell.setupCellData(model: modelLatestDetails!)
else
let modelLatestDetails = favoriteDetilsModel?.data![indexPath.section].items![indexPath.row]
cell.setupCellData(model: modelLatestDetails!)
return cell
【问题讨论】:
在此处添加此单元格的完整代码。model?.data![indexPath.section].items![indexPath.row]
- 数据和项目是简单的数组还是你的重载“[..]”(下标)?
有嵌套的字典数组先生!
有多个部分,部分下有多行。
参见例如我的回答是:***.com/a/50519089/341994。但不要过早优化;按照我之前说的做,用 Instruments 找出问题是什么,这样你才能解决正确的问题。
【参考方案1】:
可能的问题:
-
单元格布局。我需要看看,你如何制作布局和重用单元格。
同时解析数据和绘制单元格。
您需要在 (
tableView.datasource = self or tableView.reloadData()
) 之前创建所有数据。因此,您的 [AttributedString] 必须在重新加载 tableView 之前准备好。不要解析cellfoRowAtIndexPath
中的数据。
此外,请检查 tableView 在单元格生命周期内对每个单元格仅调用一次cellfoRowAtIndexPath
。
【讨论】:
Vasily Bodnarchuk:我已经编辑了我的问题,请您看一下。以上是关于表格视图卡住了很多的主要内容,如果未能解决你的问题,请参考以下文章
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