如何在iOS中绘制工具提示

// 创建一个按钮
let button = UIButton(type: .system)
button.setTitle("显示工具提示", for: .normal)
button.addTarget(self, action: #selector(showTooltip), for: .touchUpInside)

// 触发事件
@objc func showTooltip() {
    // 创建UIPopoverPresentationController实例
    let popover = UIViewController()
    popover.modalPresentationStyle = .popover
    popover.preferredContentSize = CGSize(width: 200, height: 100)
    
    // 设置内容
    let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
    label.text = "这是一个工具提示"
    label.textAlignment = .center
    popover.view.addSubview(label)
    
    // 设置UIPopoverPresentationController
    let popoverController = popover.popoverPresentationController
    popoverController?.sourceView = button
    popoverController?.sourceRect = button.bounds
    popoverController?.permittedArrowDirections = .any
    
    // 显示工具提示
    present(popover, animated: true, completion: nil)
}