由于使用本地变量在Xcode11.3以上版本中进行优化导致iOS应用程序崩溃

Question

我正在使用XCode 11.6生成一个带有优化的构建。

优化构建设置为

Apple CLang Code Generation
Optimization Level: Fastest, Smallest [-Os]
Swift Compiler - Code Generation
Optimization Level: Optimize for speed [-O]

我在下面的代码中遇到了崩溃。我只想知道为什么只有11.3以上的XCode版本生成的优化构建会崩溃。

    //it crashes only when the object is declared as var not let
    var view : UIView = UIView.init(frame: CGRect.zero) 

    //lblContainer is a weak variable defined in class
    self.lblContainer = view; 
    
    //it always crashes here
    self.lblContainer.isUserInteractionEnabled = false

    self.lblContainer.translatesAutoresizingMaskIntoConstraints = false;
    self.addSubview(self.lblContainer)
    self.lblContainer.backgroundColor = UIColor.clear;
    self.lblContainer.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true;
    self.lblContainer.centerYAnchor.constraint(equalTo: self.centerYAnchor).isActive = true;
    self.lblContainer.leftAnchor.constraint(greaterThanOrEqualTo: self.leftAnchor, constant: 8.0).isActive = true
    self.lblContainer.rightAnchor.constraint(lessThanOrEqualTo: self.rightAnchor, constant: -8.0).isActive = true

​

​

您可以在此处找到sample project

Answer 1

1.请尝试通过执行print(type(of:self.lblContainer.isUserInteractionEnabled))找出self.lblContainer.isUserInteractionEnabled的类型(我确定它是布尔值)

2.查看另一个堆栈溢出post here，以查找出现的错误