我的任务是编写一个小应用程序,其中必须将各种 Controller 嵌入到默认 Controller 中。所有 Controller 都存储在一个 Storyboard中。
在 subview 中嵌入 Controller 的示例代码
if let id = getControllerId(pageIndex) { // get controller's storyboard id by segmented index
let storyBoard = NSStoryboard(name: "Main", bundle: nil)
let controller = storyBoard.instantiateControllerWithIdentifier(id) as! NSViewController
controller.view.translatesAutoresizingMaskIntoConstraints = false
if self.view.subviews.count > 0 {
let prevView = self.view.subviews[0]
prevView.removeFromSuperview() // here should be releasing previous controller
}
self.view.addSubview(controller.view)
// make all side constraints
let views = ["view": controller.view]
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-(0)-[view]-(0)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-(0)-[view]-(0)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views))
} else {
NSLog("ERROR: Unable get controller storyboard id for index \(pageIndex)")
}
而且我注意到嵌入式 Controller 不执行 viewWillDisappear。我需要这个事件来清除观察者和其他一些东西。
我不确定将 Controller 显示为嵌入在 subview 中的正确方法,但我没有找到任何其他解决方案。
我制作示例项目来测试这种情况
https://github.com/avvensis/embeddedviewcontrollers
谁能帮我解决这个问题?
最佳答案
viewWillDisappear 不会执行,因为您没有隐藏任何内容。
你的控制者在你创造他之后很快就会死去。所以第 1 步是对其进行引用:
class ViewController: NSViewController {
// MARK: - Custom properties
let pageIds: [String] = ["redController", "yellowController", "greenController"]
var currentControler : NSViewController!
...
private func showEmbeddedController(pageIndex: Int) {
if let id = getControllerId(pageIndex) { // get controller's storyboard id by segmented index
let storyBoard = NSStoryboard(name: "Main", bundle: nil)
currentControler = storyBoard.instantiateControllerWithIdentifier(id) as! NSViewController
currentControler.view.translatesAutoresizingMaskIntoConstraints = false
if self.view.subviews.count > 0 {
let prevView = self.view.subviews[0]
prevView.removeFromSuperview() // here should be releasing previous controller
}
self.view.addSubview(currentControler.view)
// make all side constraints
let views = ["view": currentControler.view]
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("|-(0)-[view]-(0)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-(0)-[view]-(0)-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: views))
} else {
NSLog("ERROR: Unable get controller storyboard id for index \(pageIndex)")
}
}
}
然后在你的基础 Controller 中使用 deinit 方法:
class EmbeddedViewController: NSViewController {
....
deinit {
print("DEBUG: \(self.className) deinit")
}
}
关于swift - 正确释放嵌入在 subview 中的 NSViewController,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38893822/