我很难解决一个问题。我有一个包含许多原型(prototype)单元的表格 View 。其中之一是我使用标签 View 来显示选定的多个标签。所以我使用了一个 XIB 文件，其中有一个 TAGVIEW 作为它的 subview ，并且我在 TableView 单元格中使用了该 XIB。现在，当我第一次加载表格 View 并向下滚动时，单元格的高度很大，但是当我向下和向上滚动时，它适合标签的大小。我已经尝试了以下解决方案，但没有一个有效。
我尝试了解决方案:
1.cell.layoutIfNeeded 在返回单元格之前。
2.cell.layoutSubView
3.cell.tagView.layoutIfNeeded
4.cell.setNeedsLayout()
5.ViewDidAppear中Relaod tableview
6.在tagViewCellXIB中，在AwakeForNib方法中添加self.layoutIfNeeded。
7.在tagViewCellXIB中，重写didMoveToParent()并添加self.layoutIfNeeded。
这是 tagViewCell 类
class TagViewCell: UITableViewCell {
@IBOutlet weak var tagView: TagListView!
@IBOutlet weak var textfield: UITextField!
@IBOutlet weak var titleLbl: UILabel!
@IBOutlet weak var heightTagViewConstraint : NSLayoutConstraint!
@IBOutlet weak var lblValidation: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
self.layoutIfNeeded()
// Initialization code
}
override func didMoveToSuperview() {
super.didMoveToSuperview()
self.layoutIfNeeded()
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
self.heightTagViewConstraint.constant = 35
}
func configureView(type: TagCellType){
switch type {
case .Language:
setupLanguageCell()
titleLbl.text = "Language"
textfield.isHidden = true
if UserData.userData.language.count == 0{
tagView.isHidden = true
textfield.isHidden = false
textfield.placeholder = "What languages do you speak?"
}
break
default:
textfield.isHidden = true
setupTagCell(tagType: type)
if type == .preferArea {
seUpPreffredAreaValidation()
titleLbl.text = "Preferred areas"
if UserData.userData.preferAreaArr.count == 0{
tagView.isHidden = true
textfield.isHidden = false
textfield.placeholder = "What areas do you prefer?"
}
}
else if type == .City{
titleLbl.text = "Preferred cities"
if UserData.userData.cities.count == 0{
tagView.isHidden = true
textfield.isHidden = false
textfield.placeholder = "What city do you prefer? (Optional)"
}
}else{
titleLbl.text = "Preferred countries"
if UserData.userData.country.count == 0{
tagView.isHidden = true
textfield.isHidden = false
textfield.placeholder = "What country do you prefer? (Optional)"
}
}
break
}
}
/// Set up tag view
func setupLanguageCell() {
tagView.removeAllTags()
tagView.tag = 1003 // For Language field
for (index, elememt) in UserData.userData.language.enumerated() {
print(index)
if let langDict = elememt as? NSDictionary{
tagView.isHidden = false
let languageTagView = tagView.addTag(langDict.value(forKey: "lang_name") as! String)
languageTagView.tagBackgroundColor = UIColor.clear
languageTagView.textColor = .black
languageTagView.textFont = UIFont.systemFont(ofSize: 17)
languageTagView.paddingX = -1
languageTagView.isUserInteractionEnabled = false
let levelTagView = tagView.addTag(Constants.languageLevel[langDict.value(forKey: "level") as! Int])
levelTagView.frame = CGRect(x: levelTagView.frame.origin.x, y: (languageTagView.frame.height / 2) - (levelTagView.frame.height / 2) + 2, width: levelTagView.frame.width, height: levelTagView.frame.height)
levelTagView.layoutIfNeeded()
levelTagView.layoutSubviews()
levelTagView.tagBackgroundColor = UIColor().textOrange()
levelTagView.textFont = UIFont.systemFont(ofSize: 10)
levelTagView.cornerRadius = 6
print("pading yyyyyy \(String(describing: tagView.rowViews.last?.frame.minY))")
if UserData.userData.language.count == index+1{
if (tagView.rowViews.last?.frame.minY)! == 48{
levelTagView.frame.origin.y = (languageTagView.frame.height / 2) - (levelTagView.frame.height / 2) + 8
}
}
}
}
if UserData.userData.language.count == 0 {
self.lblValidation.isHidden = false
} else {
self.lblValidation.isHidden = true
}
}
func seUpPreffredAreaValidation() {
if UserData.userData.preferAreaArr.count == 0 {
self.lblValidation.isHidden = false
} else {
self.lblValidation.isHidden = true
}
}
/// setup cell for country and cities
///
/// - Parameter tagType: type of cell country or cities
func setupTagCell(tagType:TagCellType) {
tagView.removeAllTags()
var tagArray:[String] = []
tagArray = UserData.userData.country
tagView.tag = 1001 // For countries field
if tagType == .City {
tagArray = []
tagArray = UserData.userData.cities
tagView.tag = 1002 // For city field
}
if tagType == .preferArea {
tagArray = []
tagArray = UserData.userData.preferAreaArr
tagView.tag = 1003
}
var tagValue = ""
for (_, elememt) in tagArray.enumerated() {
tagView.isHidden = false
print(elememt)
if elememt.characters.count > 17 {
let index = elememt.index(elememt.startIndex, offsetBy: 16)
tagValue = elememt.substring(to: index) + ".."
}else{
tagValue = elememt
}
let levelTagView = tagView.addTag(tagValue)
levelTagView.tagBackgroundColor = UIColor().textOrange()
tagView.textFont = UIFont.systemFont(ofSize: 17)
levelTagView.cornerRadius = 8
levelTagView.enableRemoveButton = false
levelTagView.paddingX = 6
levelTagView.paddingY = 3
}
}
}
对于 cellForRowAtIndexPath 使用以下代码
let cell = self.tableView.dequeueReusableCell(withIdentifier: "tagcell", for: indexPath) as! TagViewCell
cell.configureView(type: .City)
cell.tagView.delegate = self
if UserData.userData.cities.count >= 0 && UserData.userData.cities.count <= 3 {
cell.heightTagViewConstraint.constant = 25.7
}
else if let height = cell.tagView.subviews.last?.frame.maxY {
cell.heightTagViewConstraint.constant = height + 10
}
return cell
最佳答案
在 TagViewCell 类中重写 layoutSubviews，如下所示
class TagViewCell: UITableViewCell {
override func layoutSubviews() {
//Set the frame of tagView here
//self.tagView.frame =
}
}
并在返回单元格时调用cell.layoutIfNeeded。如果您仍然遇到任何问题，请发表评论。我们随时为您提供帮助。
关于ios - 第一次 UITableView 中的 tableview cell XIB 高度不正确？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50479163/