我在嘗試在另一個表視圖的單元格內構建表視圖時遇到了問題。我認為這是一個非常簡單的任務......
應用程式結構：
- 帶有鍛煉專案的集合視圖。
- 點擊每個后，用戶將被移動到發生問題的靜態表視圖。
我在 Reveal 應用程式中注意到表格視圖出現在單元格中，它并沒有說約束不正確，一切看起來都很好。但是表格視圖的框架高度為 0.333。
顯示應用程式螢屏截圖和表格視圖存在的事實
但用戶會看到：
I tried methods(with different values) as tough: estimatedHeightForRowAt, heightForRowAt, but they do nothing, by the way UITableView.automaticDimension returns -1.
But when I set explicitly height for the row for outermost table view everything is good, except the fact that the size will be different in distinct elements, and table view is too big, or too small. I made this constraint, but it seems work only for one case when element has 3 splits:
self.heightAnchor.constraint(equalToConstant: 40 titleLabel.frame.height CGFloat(splits.count) * 44.0)
| With 3 splits in element | Less than 3 |
|---|---|
 |
 |
I read that adding subviews of custom cell to contentView instead of cell itself helped somebody, but in my case I got this message:
Warning once only: Detected a case where constraints ambiguously suggest a height of zero for a table view cell's content view. We're considering the collapse unintentional and using standard height instead. Cell: <projectClimber.SplitCell: 0x140670050; baseClass = UITableViewCell; frame = (0 0; 355 44); autoresize = W; layer = <CALayer: 0x600003797700>>
I was able to dispose of this warning actually by removing contentView and just add sub view to cell itself. But it doesn’t solve anything.
I don’t really know how to set proper value to table view's height, maybe there’s an approach without using table view or maybe in different way. I want to hear your opinion about this, thank you.
Code
Main table view
class WorkoutStatisticsTableViewController: UITableViewController {
....
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
//...
//Switch statement and other cases
//...
case 3:
let cell = FourthTableViewCell()
cell.configure(with: workout)
cell.selectionStyle = .none
// Here I added
return cell
}
//I tried these methods, but nothing changed
// override func tableView(_ tableView: UITableView, estimatedHeightForRowAt
indexPath: IndexPath) -> CGFloat {
// return 250
// }
//
// override func tableView(_ tableView: UITableView, heightForRowAt indexPath:
IndexPath) -> CGFloat {
//
// return UITableView.automaticDimension
// }
....
}
Table view cell class, where lay title label and table view
class FourthTableViewCell: UITableViewCell, UITableViewDelegate, UITableViewDataSource {
//...
//Methods for tableview delegate and data source and implementation of title label
//...
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) ->
UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: SplitCell.reuseIdentifier, for: indexPath) as! SplitCell
cell.configure(cellWithNumber: indexPath.row 1, with: splits[indexPath.row])
cell.selectionStyle = .none
return cell
}
//Number of splits, i.e. rows in table view in this cell
var splits: [Int] = []
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
self.tableView.dataSource = self
self.tableView.delegate = self
//just for making table view visible
self.tableView.backgroundColor = .orange
tableView.register(SplitCell.self, forCellReuseIdentifier: SplitCell.reuseIdentifier)
addSubview(titleLabel)
addSubview(tableView)
titleLabel.translatesAutoresizingMaskIntoConstraints = false
tableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 20),
titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20),
titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20),
tableView.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 10),
tableView.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 10),
tableView.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -10),
tableView.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -10),
// Tried this line for calculating height of cell
// self.heightAnchor.constraint(equalToConstant: 40 titleLabel.frame.height CGFloat(splits.count) * 44.0)
])
}
//Configure cell with workout element, which is used for taking splits
func configure(with workout: Workout) {
print("Configure func, workout's splits \(workout.splits.count)")
//Need to populate splits this way, because in workout I use List<Int>
for item in workout.splits {
self.splits.append(item)
}
}
}
Split cell class. Where is located only two labels
class SplitCell: UITableViewCell {
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
addSubview(titleLabel)
addSubview(timeLabel)
titleLabel.translatesAutoresizingMaskIntoConstraints = false
timeLabel.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
titleLabel.topAnchor.constraint(equalTo: topAnchor, constant: 10),
titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 15),
titleLabel.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -10),
timeLabel.topAnchor.constraint(equalTo: topAnchor, constant: 10),
timeLabel.leadingAnchor.constraint(equalTo: titleLabel.trailingAnchor, constant: 50),
timeLabel.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -10)
])
}
func configure(cellWithNumber number: Int, with time: Int) {
titleLabel.text = "Split #\(number)"
timeLabel.text = String.makeTimeString(seconds: time)
}
}
uj5u.com熱心網友回復：
經過十幾次嘗試后，我決定將此約束用于表視圖，它位于靜態表視圖的單元格內：
tableView.heightAnchor.constraint(equalToConstant: CGFloat(splits.count) * 27)
但是還有一個問題——魔法值。27 是 17 的總和，它是標簽的高度，10 是內部表格視圖單元格中標簽的底部和頂部約束常數的總和。
我相信某處有更好的解決方案，但現在總比沒有好。
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標籤：ios swift uitableview autolayout