使用Swift从Xib / nib实例化UIView

Question

尝试按以下方式调用此函数时，收到错误的Ambiguous reference to member 'TimelineSectionHeaderView' ：

if let view = TimelineSectionHeaderView.instantiateFromNib() {
    return view
}

我在这里做错了什么？

import UIKit

class TimelineSectionHeaderView: UIView {

  @IBOutlet weak var dayLabel: UILabel!
  @IBOutlet weak var dateLabel: UILabel!

  class func instantiateFromNib() -> TimelineSectionHeaderView? {
      let x = UINib(nibName: "timelineSectionHeader", bundle: nil).instantiate(withOwner: nil, options: nil).first as? TimelineSectionHeaderView
      print(x ?? "no value")
      return x
  }
}

Answer 1

您需要在下面删除此行：-

if let view = TimelineSectionHeaderView.instantiateFromNib() {
    return view
}

创建一个这样的实例方法：

func instantiateFromNib() -> TimelineSectionHeaderView? {
      let x = UINib(nibName: "timelineSectionHeader", bundle: nil).instantiate(withOwner: nil, options: nil).first as? TimelineSectionHeaderView
      print(x ?? "no value")
      return x
  }

现在在您的ViewController中，您可能已经使用该outlet变量创建了TimelineSectionHeaderView outlet ，然后像这样调用它：

if let view = timelineViewInstanceVariable.instantiateFromNib() {
    return view
}