对不起，我是斯威夫特的初学者。
首先，我有一个UITableview和一个动态UITableViewCell。
我有一个关于在动态单元格中计算行号的问题。
我在堆栈中找到两个UILabel扩展名答案，但它们对我不起作用。
对我有什么想法吗？
谢谢。
class ViewController: UIViewController {
let tableView = UITableView()
let cellNoButton = "cellNoButton"
let cellWithButton = "cellWithButton"
var isExpand: Bool = true
let text = "Students, who translate English texts, do exercises and do tests are very good at translating, doing exercises and doing tests, but they have problems with understanding English in real life. In real life, nobody waits for your translation. People usually use simple English when they speak but they use it fast. You have to understand with no translation to your native language. If you translate, you cannot be part of communication because you are thinking about the language too much. These words are maybe hard to read but they are true.So, if you want to understand English fast and learn fast, read two articles or more a day. You can improve your reading and listening quickly when you read easy English news. We will help you learn English fast and understand it. When you use this website every day, you can learn 3000 words which you need for communication with anybody in English."
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
tableView.separatorInset = .zero
tableView.estimatedRowHeight = 50
tableView.rowHeight = UITableViewAutomaticDimension
tableView.register(NoButtonTableViewCell.self, forCellReuseIdentifier: cellNoButton)
tableView.register(WithButtonTableViewCell.self, forCellReuseIdentifier: cellWithButton)
self.view.addSubview(tableView)
tableView.snp.makeConstraints { (make) in
make.top.left.right.bottom.equalToSuperview()
}
}
}
extension ViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if isExpand {
let cell = tableView.dequeueReusableCell(withIdentifier: cellNoButton, for: indexPath) as! NoButtonTableViewCell
cell.titleLabel.text = text //titleLabel.numberOfLines = 0
print("===) \(cell.titleLabel.numberOfVisibleLines)") //it return 1.
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: cellWithButton, for: indexPath) as! WithButtonTableViewCell
return cell
}
}
}
extension UILabel {
var numberOfVisibleLines: Int {
let textSize = CGSize(width: CGFloat(self.frame.size.width), height: CGFloat(MAXFLOAT))
let rHeight: Int = lroundf(Float(self.sizeThatFits(textSize).height))
let charSize: Int = lroundf(Float(self.font.pointSize))
return rHeight / charSize
}
func calculateMaxLines() -> Int {
let maxSize = CGSize(width: frame.size.width, height: CGFloat(Float.infinity))
let charSize = font.lineHeight
let text = (self.text ?? "") as NSString
let textSize = text.boundingRect(with: maxSize, options: .usesLineFragmentOrigin, attributes: [.font: font], context: nil)
let linesRoundedUp = Int(ceil(textSize.height/charSize))
return linesRoundedUp
}
}
最佳答案
试用此代码以获取行数
extension UILabel {
func calculateLines() -> Int {
let maxSize = CGSize(width: frame.size.width, height: CGFloat(Float.infinity))
let charSize = font.lineHeight
let text = (self.text ?? "") as NSString
let textSize = text.boundingRect(with: maxSize, options: .usesLineFragmentOrigin, attributes: [.font: font], context: nil)
let linesRoundedUp = Int(ceil(textSize.height/charSize))
return linesRoundedUp
}
}
关于ios - 如何在UITableViewCell中计算UILabel正确的行号？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/53863731/