我遇到了iOS 8 beta 4(beta 5也一样)的问题,即UILabel在UITableViewCells中没有显示所有文本。我使用了自适应大小单元格来实现这一点,并为所有设备使用一个故事板。
以下是iPhone上的效果:
图片
代码:
ViewController.swift
这是我的故事板:
我认为这可能是beta 4中的一个错误,但根据发布说明,它应该在beta 5中得到修复:
在beta 5中修复了: 当多行标签的宽度由于某些视图的layoutMargins更改而更改时,标签的内在内容大小没有被无效化,而应该被无效化。结果,布局可能会意外地截断标签(或文本视图)。///解决方法:正在更改layoutMargins的视图应覆盖layoutMarginsDidChange并将invalidateIntrinsicContentSize发送到标签。
以下是iPhone上的效果:
图片
代码:
ViewController.swift
@IBOutlet var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.registerClass(TableViewCell.self, forCellReuseIdentifier: "cell")
self.tableView.estimatedRowHeight = 200
self.tableView.rowHeight = UITableViewAutomaticDimension
}
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as TableViewCell
switch indexPath.row {
case 0:
cell.label.text = "hello hello hello hellohellohellohellohello hello hello hello hello hello hello hello hellohellohello hellohello hellohellohellohellohello hello hello hello hello hello hello hello hello hello hello hello hello hellohellohello hello hello hello"
case 1:
cell.label.text = "doesn'twork doesn'tworkdoesn't work doesn'twork doesn'tworkdoesn't work doesn'twork doesn'twork doesn't workdoesn't workdoesn'twork doesn'twork doesn't workdoesn't workdoesn't workdoesn'twork "
case 2:
cell.label.text = "baims baimsbaimsbaims baimsbaimsbaimsbaims baims baimsbaims baimsbaimsbaimsbaims baimsbaims baims baimsbaimsbaims baimsbaims baims baimsbaimsbaimsbaims baimsbaims baimsbaims baimsbaims"
default:
cell.label.text = "hello hello hello hellohellohellohellohello hello hello hello hello hello hello hello hellohellohello hellohello hellohellohellohellohello hello hello hello hello hello hello hello hello hello hello hello hello hellohellohello hello hello hello"
}
cell.setNeedsUpdateConstraints()
cell.updateConstraintsIfNeeded()
return cell
}
TableViewCell.swift
var label : UILabel!
var didUpdateConstraints = false
override init(style: UITableViewCellStyle, reuseIdentifier: String) {
self.label = UILabel()
self.label.textColor = self.label.tintColor
self.label.numberOfLines = 0
self.label.setTranslatesAutoresizingMaskIntoConstraints(false)
super.init(style: style, reuseIdentifier: reuseIdentifier)
self.contentView.addSubview(self.label)
}
override func updateConstraints() {
if !self.didUpdateConstraints {
self.contentView.addConstraint(NSLayoutConstraint(item: self.label, attribute: .Leading, relatedBy: .Equal, toItem: self.contentView, attribute: .Leading, multiplier: 1, constant: 20))
self.contentView.addConstraint(NSLayoutConstraint(item: self.label, attribute: .Trailing, relatedBy: .Equal, toItem: self.contentView, attribute: .Trailing, multiplier: 1, constant: 20))
self.contentView.addConstraint(NSLayoutConstraint(item: self.label, attribute: .Bottom, relatedBy: .Equal, toItem: self.contentView, attribute: .Bottom, multiplier: 1, constant: 10))
self.contentView.addConstraint(NSLayoutConstraint(item: self.label, attribute: .Top, relatedBy: .Equal, toItem: self.contentView, attribute: .Top, multiplier: 1, constant: 13))
self.didUpdateConstraints = true
}
super.updateConstraints()
}
这是我的故事板:
![storyboard](https://istack.dev59.com/4jPzS.webp)
在beta 5中修复了: 当多行标签的宽度由于某些视图的layoutMargins更改而更改时,标签的内在内容大小没有被无效化,而应该被无效化。结果,布局可能会意外地截断标签(或文本视图)。///解决方法:正在更改layoutMargins的视图应覆盖layoutMarginsDidChange并将invalidateIntrinsicContentSize发送到标签。