xcode导航栏按钮状态
xcode导航栏按钮状态
提问于 2019-03-15 15:03:11
我有一个编辑按钮- UIBarButtonItem
单击时，它将从屏幕上消失
并在单击“取消”按钮时出现
如您所见，编辑按钮的状态在出现后保持选中状态。如何以编程方式将导航栏按钮状态更改为正常状态？或者给我一个更好的建议。
以下是我的项目代码
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, introductionDelegate {
var navBarEditButton: UIBarButtonItem?
var navBarDeleteButton: UIBarButtonItem?
var navBarCancelButton: UIBarButtonItem?
override func viewDidLoad() {
super.viewDidLoad()
self.navBarEditButton = UIBarButtonItem(title: "Edit", style: .plain, target: self, action: #selector(editObjectsAction))
self.navBarDeleteButton = UIBarButtonItem(title: "Delete", style: .plain, target: self, action: #selector(deleteObjectsAction))
self.navBarCancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelAction))
self.navigationItem.leftBarButtonItems = [navBarEditButton!]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@objc private func editObjectsAction(_ sender: UIBarButtonItem) {
self.navigationItem.leftBarButtonItems = [navBarCancelButton!, navBarDeleteButton!]
}
@objc private func cancelAction(_ sender: UIBarButtonItem) {
self.navigationItem.leftBarButtonItems = [navBarEditButton!]
}
@objc private func deleteObjectsAction(_ sender: UIBarButtonItem) {
}回答 2
Stack Overflow用户
回答已采纳
发布于 2019-03-15 17:50:33
我添加了一个新函数
func refreshNavBarButton (navBarButton: inout UIBarButtonItem) {
navBarButton = UIBarButtonItem(title: navBarButton.title, style: navBarButton.style, target: navBarButton.target, action: navBarButton.action)
}我每次都会在导航栏按钮显示之前调用它
refreshNavBarButton(navBarButton: &navBarEditButton!)
self.navigationItem.leftBarButtonItems = [navBarEditButton!]Stack Overflow用户
发布于 2019-03-15 15:17:47
您可以使用UIButton创建UIBarButtonItem并处理该按钮上的状态。这样，您可以更改UIBarButtonItem样式，但只需检查是否获得了预期的结果。
let myButton = UIButton(frame: CGRect(x: 10, y: 300, width: 100, height: 40)) // handle state on this button
self.navBarEditButton = UIBarButtonItem(customView: myButton)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/55177246
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