iOS8之后新增了UIPopoverPresentationController,可以实现类似于iPad的UIPopoverController.
Demo地址
第一步:
打开Main.storyboard,在默认的ViewController中添加一个UIButton,然后新建一个UIView
Controller,并将UIButton的action事件指向新创建的ViewController.
如下图所示:
Main.storyboard示例图.png
第二步:
打开ViewController.swift,并添加代码.
import UIKit
class ViewController: UIViewController, UIPopoverPresentationControllerDelegate {
@IBOutlet weak var button: UIButton!
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let vc = segue.destination
vc.modalPresentationStyle = .popover
//箭头所指区域
vc.popoverPresentationController?.sourceView = button
vc.popoverPresentationController?.sourceRect = button.bounds
//箭头方向
vc.popoverPresentationController?.permittedArrowDirections = .up
//设置代理
vc.popoverPresentationController?.delegate = self
//弹出窗口大小
vc.preferredContentSize = CGSize(width: 200, height: 300)
}
//iPhone下默认是.overFullScreen(全屏显示)，需要返回.none，否则，没有弹窗效果。iPad不需要
func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
return .none
}
}
注意事项:
- 遵守
UIPopoverPresentationControllerDelegate代理 - 实现
adaptivePresentationStyle代理方法,并返回.none.(iPhone下默认是.overFullScreen) - 如果按钮不是UIButtton,而是导航栏上的UIBarButtonItem.由于该控件没有指定的frame,无法设置
sourceView和sourceRect,将箭头所指区域下的两行代码修正一下即可:
vc.popoverPresentationController?.barButtonItem = self.navigationItem.rightBarButtonItem;
弹窗效果.png
