先說(shuō)一下存在的問(wèn)題：昨天晚上處理一個(gè)相對(duì)比較復(fù)雜的自適應(yīng)cell讹俊，想緩存獲取的高度不對(duì)牵啦。這里貼一下圖迫皱。這里這是展示布局上很少的一部分。有時(shí)間再研究一下
IMG_0012.PNG
下面說(shuō)一下正常情況了昙沦。也可能是上面的布局太復(fù)雜琢唾，哪里出了問(wèn)題。先展示一下獲取正常高度的圖
IMG_0013.PNG
1盾饮、先看cell里面的代碼采桃；最主要的是看約束，相對(duì)cell的top bottom(whiteView),以及whiteView的子視圖相對(duì)于whiteView的約束
lazy var whiteView:UIView = {
let view = UIView()
view.backgroundColor = .white
view.layer.cornerRadius = 5
view.layer.shadowColor = UIColor.init(hex: "0x3B6FF5").cgColor
view.layer.shadowOffset = CGSize(width: 0, height: 0)
view.layer.shadowRadius = 5
view.layer.shadowOpacity = 0.8
return view
}()
lazy var titleLabel: UILabel = {
let view = UILabel()
view.text = "描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題描述標(biāo)題"
view.numberOfLines = 0
view.font = .systemFont(ofSize: 14)
view.sizeToFit()
return view
}()
lazy var picImageView: UIImageView = {
let view = UIImageView()
view.image = UIImage.image(image: UIImage.init(named: "001")!, orientation: .up)
return view
}()
lazy var commentView:ALFitHeightView = {
let view = ALFitHeightView()
return view
}()
func al_makeUI(){
self.contentView.addSubview(self.whiteView)
self.whiteView.addSubview(self.titleLabel)
self.whiteView.addSubview(self.picImageView)
self.whiteView.addSubview(self.commentView)
self.titleLabel.snp.makeConstraints { (make) in
make.leading.top.equalToSuperview().offset(15)
make.right.equalToSuperview().offset(-15)
}
self.picImageView.snp.makeConstraints { (make) in
make.leading.equalTo(self.titleLabel)
make.right.equalTo(self.titleLabel)
// make.center.equalToSuperview()
make.top.equalTo(self.titleLabel.snp.bottom).offset(5)
}
self.commentView.snp.makeConstraints { (make) in
make.top.equalTo(self.picImageView.snp.bottom).offset(5)
make.left.equalTo(self.titleLabel.snp.left)
make.right.equalTo(self.titleLabel.snp.right)
make.bottom.equalToSuperview().offset(-15)
}
self.whiteView.snp.makeConstraints { (make) in
make.top.left.equalToSuperview().offset(10)
make.bottom.right.equalToSuperview().offset(-10)
}
}
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
self.selectionStyle = .none
al_makeUI()
}
2丘损、看控制器里面的代碼
var heightArr:NSMutableArray = {
let arr = NSMutableArray()
return arr
}()
lazy var tableView: UITableView = {
let view = UITableView.init(frame: CGRect(x: 0, y: CGFloat(NavigationHeight), width: self.view.frame.size.width, height: self.view.frame.size.height - CGFloat(NavigationHeight)), style: .plain)
view.delegate = self
view.dataSource = self
view.separatorStyle = .none
view.register(ALFitHeightTableViewCell.self, forCellReuseIdentifier: "cell")
view.tableFooterView = UIView.init(frame: CGRect.zero)
view.backgroundColor = UIColor.init(hex: "FAFBFF")
if #available(iOS 11, *){
view.contentInsetAdjustmentBehavior = .never
}else{
if #available(iOS 13.0, *) {
view.automaticallyAdjustsScrollIndicatorInsets = false
} else {
self.automaticallyAdjustsScrollViewInsets = false
}
}
return view
}()
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 30
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if self.heightArr.count > 0 {
let height = self.heightArr[safe:indexPath.row]
if height != nil {
DebugLog("1111")
return height as! CGFloat
}
return UITableView.automaticDimension
// return height != nil ? height as! CGFloat : UITableView.automaticDimension
}else{
return UITableView.automaticDimension
}
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 100
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ALFitHeightTableViewCell
return cell
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
let height = self.heightArr[safe:indexPath.row]
if height == nil{
let height = cell.systemLayoutSizeFitting(CGSize(width: self.tableView.width(), height: 0), withHorizontalFittingPriority: .required, verticalFittingPriority: .fittingSizeLevel).height
self.heightArr.add(height)
DebugLog(height)
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
}
override func viewDidLoad() {
super.viewDidLoad()
self.navTitle = "tableviewcell高度自適應(yīng)"
self.view.addSubview(self.tableView)
}
補(bǔ)充：經(jīng)一朋友提醒芍碧，試了一下 func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) 在這個(gè)方法里面可以直接拿到cell.frame，可以不用再調(diào)用系統(tǒng)的systemLayoutSizeFitting方法再計(jì)算一遍消耗CPU資源
