我在tableViewCell中嵌入了一个collectionView。我从this回答了一个例子，除了我希望我的collectionViewCells大小不同。这里是我计算tableViewRowHeight并在collectionView中标记框架的代码。对不起我的硬编码，我只是想以某种方式去做（。
以下是代码：
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
var cellHeight: CGFloat = 0.0
let screenWidth: CGFloat = UIScreen.mainScreen().bounds.height
var question: NSString = events[indexPath.row].category
var size = CGSizeMake(screenWidth * 0.2, 9999)
var textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
size = textRect.size
cellHeight = size.height
question = events[indexPath.row].event
size = CGSizeMake(screenWidth * 0.3, 9999)
textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
size = textRect.size
if cellHeight < size.height {
cellHeight = size.height
}
question = events[indexPath.row].location
size = CGSizeMake(screenWidth * 0.3, 9999)
textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
size = textRect.size
if cellHeight < size.height {
cellHeight = size.height
}
question = events[indexPath.row].date
size = CGSizeMake(screenWidth * 0.1, 9999)
textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
size = textRect.size
if cellHeight < size.height {
cellHeight = size.height
}
question = events[indexPath.row].time
size = CGSizeMake(screenWidth * 0.1, 9999)
textRect = question.boundingRectWithSize(size, options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!], context: nil)
size = textRect.size
if cellHeight < size.height {
cellHeight = size.height
}
return cellHeight
}
我的数据类有5个标签，我试图找出最大标签的高度。也许你可以告诉我更好的方法，因为我是新手（。然后在我的customTableViewCell.xib中，我的collectionView带有对所有边缘的约束。这里是cellForItemAtIndexPath的代码：
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
var cell:CustomCollectionViewCell? = collectionView.dequeueReusableCellWithReuseIdentifier("FOLDER_CELL", forIndexPath: indexPath) as? CustomCollectionViewCell
var rect: CGRect?
switch indexPath.row {
case 0:
cell!.frame = CGRectMake(0, 0, self.foldersCollectionView.frame.width * 0.2, self.foldersCollectionView.frame.height)
rect = cell!.frame
cell!.label.frame = rect!
cell!.label.text = event!.category
break
case 1:
cell!.frame = CGRectMake(self.foldersCollectionView.frame.width * 0.2, 0, self.foldersCollectionView.frame.width * 0.3, self.foldersCollectionView.frame.height)
rect = cell!.frame
cell!.label.frame = rect!
cell!.label.text = event!.event
break
case 2:
cell!.frame = CGRectMake(self.foldersCollectionView.frame.width * 0.5, 0, self.foldersCollectionView.frame.width * 0.26, self.foldersCollectionView.frame.height)
rect = cell!.frame
cell!.label.frame = rect!
cell!.label.text = event!.location
break
case 3:
cell!.frame = CGRectMake(self.foldersCollectionView.frame.width * 0.76, 0, self.foldersCollectionView.frame.width * 0.12, self.foldersCollectionView.frame.height)
rect = cell!.frame
cell!.label.frame = rect!
cell!.label.text = event!.date
break
case 4:
cell!.frame = CGRectMake(self.foldersCollectionView.frame.width * 0.88, 0, self.foldersCollectionView.frame.width * 0.12, self.foldersCollectionView.frame.height)
rect = cell!.frame
cell!.label.frame = rect!
cell!.label.text = event!.time
break
default:
break
}
println("cell frame - \(cell!.frame)")
println("cell label frame - \(cell!.label.frame)")
cell!.layer.borderColor = UIColor.blackColor().CGColor
cell!.layer.borderWidth = 0.5
return cell!
}
当我启动我的应用程序时，所有looks都很好但是当我开始滚动tableView时，它看起来像this截图。我不知道如何解决这个问题。也许我必须以不同的方式计算标签的大小，因为在控制台中它总是写下警告：
未定义UICollectionViewFlowLayout的行为，因为： 项目高度必须小于UICollectionView的高度减去该部分的顶部和底部值。
有人可以帮我解决我的问题吗？
UPDATE -------------------------------
我找到了另一种计算文字高度的解决方案：
func heightForView(text:String, font:UIFont, width:CGFloat) -> CGFloat{
let label:UILabel = UILabel(frame: CGRectMake(0, 0, width, CGFloat.max))
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.ByWordWrapping
label.font = font
label.textAlignment = .Center
label.text = text
label.sizeToFit()
return label.frame.height
}
以下是我如何使用它：
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
let screenWidth: CGFloat = UIScreen.mainScreen().bounds.width - 14
var large: String = events[indexPath.row].category
var largeWidth: CGFloat = screenWidth * 0.2
var cellHeight: CGFloat = 0.0
if count(large) < count(events[indexPath.row].event){
large = events[indexPath.row].event
largeWidth = screenWidth * 0.3
}
if count(large) < count(events[indexPath.row].location){
large = events[indexPath.row].location
largeWidth = screenWidth * 0.26
}
if count(large) < count(events[indexPath.row].date){
large = events[indexPath.row].date
largeWidth = screenWidth * 0.12
}
if count(large) < count(events[indexPath.row].time){
large = events[indexPath.row].time
largeWidth = screenWidth * 0.12
}
cellHeight = heightForView(large, font: UIFont(name: "HelveticaNeue-Light", size: 18.0)!, width: largeWidth)
cellHeight += 15.0
println("ch - \(cellHeight)")
return cellHeight
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
var cell:CustomCollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("FOLDER_CELL", forIndexPath: indexPath) as! CustomCollectionViewCell
let screenWidth: CGFloat = self.foldersCollectionView.frame.width
var large: String = event!.category
var largeWidth: CGFloat = screenWidth * 0.2
var cellHeight: CGFloat = 0.0
if count(large) < count(event!.event){
large = event!.event
largeWidth = screenWidth * 0.3
}
if count(large) < count(event!.location){
large = event!.location
largeWidth = screenWidth * 0.26
}
if count(large) < count(event!.date){
large = event!.date
largeWidth = screenWidth * 0.12
}
if count(large) < count(event!.time){
large = event!.time
largeWidth = screenWidth * 0.12
}
cellHeight = heightForView(large, font: UIFont(name: "HelveticaNeue-Light", size: 18.0)!, width: largeWidth)
cellHeight += 15.0
println("fcv - \(cellHeight)")
var rect: CGRect?
switch indexPath.row {
case 0:
cell.frame = CGRectMake(0, 0, screenWidth * 0.2, cellHeight)
rect = cell.frame
//cell.label.frame = rect!
cell.label.text = event!.category
break
case 1:
cell.frame = CGRectMake(screenWidth * 0.2, 0, screenWidth * 0.3, cellHeight)
rect = cell.frame
//cell.label.frame = rect!
cell.label.text = event!.event
break
case 2:
cell.frame = CGRectMake(screenWidth * 0.5, 0, screenWidth * 0.26, cellHeight)
rect = cell.frame
//cell.label.frame = rect!
cell.label.text = event!.location
break
case 3:
cell.frame = CGRectMake(screenWidth * 0.76, 0, screenWidth * 0.12, cellHeight)
rect = cell.frame
//cell.label.frame = rect!
cell.label.text = event!.date
break
case 4:
cell.frame = CGRectMake(screenWidth * 0.88, 0, screenWidth * 0.12, cellHeight)
rect = cell.frame
//cell.label.frame = rect!
cell.label.text = event!.time
break
default:
break
}
cell.layer.borderColor = UIColor.blackColor().CGColor
cell.layer.borderWidth = 0.5
return cell
}
现在一切正常，但滚动时tableView有点滞后。你能帮我优化计算吗？