我创建了一个导航,该导航会推送一个包含图像视图的视图控制器,以及一个按钮,该按钮每次单击都会添加相同的视图控制器。每次轻击后,内存都会增加,而每次后轻击后,尽管调用了deinit
,但不会释放内存。代码中没有指向内存泄漏的内容,是我缺少的东西吗?
class ViewController: UIViewController {
lazy var nextButton:UIButton? = {
let button = UIButton(type: .roundedRect)
button.setTitle("Next", for: .normal)
button.addTarget(self, action: #selector(nextButtonTapped), for: .touchUpInside)
button.translatesAutoresizingMaskIntoConstraints = false
button.backgroundColor = UIColor.red
return button
}()
lazy var imageView:UIImageView? = {
let image = #imageLiteral(resourceName: "DJI_0014")
let imageView = UIImageView(image: image)
imageView.translatesAutoresizingMaskIntoConstraints = false
return imageView
}()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
guard let imageView = self.imageView, let nextButton = self.nextButton else{
print("imageView, nextButton are nil")
return
}
self.view.backgroundColor = UIColor.white
self.view.addSubview(imageView)
NSLayoutConstraint.activate([
imageView.topAnchor.constraint(equalTo:self.view.topAnchor),
imageView.leadingAnchor.constraint(equalTo: self.view.leadingAnchor),
imageView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor),
imageView.trailingAnchor.constraint(equalTo: self.view.trailingAnchor)])
view.addSubview(nextButton)
NSLayoutConstraint.activate([nextButton.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
nextButton.centerYAnchor.constraint(equalTo: self.view.centerYAnchor, constant: 0),nextButton.heightAnchor.constraint(equalToConstant: 200),nextButton.widthAnchor.constraint(equalToConstant: 200)])
}
@objc func nextButtonTapped(){
print("next button tapped")
self.navigationController?.pushViewController(ViewController(), animated: true)
}
deinit {
print("view controller is deinitialized")
}
}
我查看了下面列出的其他问题,并试图采纳他们的建议,但似乎没有一个帮助
Navigation arc memory not released
答案 0 :(得分:0)
最后,我已经确定了问题所在,这是从navigationBar引起的:
` navigationController?.setNavigationBarHidden(true, animated: false)`
此代码将消除所有有关大内存残留的问题。代码的其他部分也可以。在这种情况下,所有内存将始终保持1900万左右。
我试图使用navigationDelegate进行转换,发现系统崩溃了,并且崩溃了,并认为如果重复执行推vc会使NavigationBar布局不正确。因此我将其隐藏起来,问题就消失了。但是,如果您确实需要navigationBar或其动画,那么这里将有很多工作要做。
但是发现了内存问题。