在表格单元格中创建UITextField成为第一响应者,可以通过以下步骤实现:
class CustomTextField: UITextField {
override func becomeFirstResponder() -> Bool {
let result = super.becomeFirstResponder()
if let tableView = superview as? UITableView, let indexPath = tableView.indexPathForRow(at: convert(CGPoint.zero, to: tableView)) {
tableView.scrollToRow(at: indexPath, at: .middle, animated: true)
}
return result
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath)
let textField = CustomTextField()
textField.frame = cell.contentView.bounds
textField.autoresizingMask = [.flexibleWidth, .flexibleHeight]
textField.tag = indexPath.row
textField.delegate = self
cell.contentView.addSubview(textField)
return cell
}
func textFieldDidBeginEditing(_ textField: UITextField) {
if let tableView = textField.superview?.superview as? UITableView, let indexPath = tableView.indexPathForRow(at: textField.frame.origin) {
tableView.scrollToRow(at: indexPath, at: .middle, animated: true)
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
if let cell = tableView.cellForRow(at: indexPath), let textField = cell.contentView.viewWithTag(indexPath.row) as? CustomTextField {
textField.becomeFirstResponder()
}
}
这样,在用户点击表格单元格时,UITextField将成为第一响应者,并自动滚动到可见区域。
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