由于信号，命令失败：分段错误：发出IR SIL功能时为11 [英] Command failed due to signal: Segmentation fault: 11 while emitting IR SIL function

问题描述

我想在 UITextView 的扩展名中添加闭包属性，因此我使用typealias定义闭包：

I want to add closure properties in the extension of UITextView so I define a closure using typealias:

typealias TextViewHeightDidChangedClosure = (_ currentTextViewHeight:CGFloat)->Void

extension UITextView{

  func setTextViewHeightDidChanged(textViewHeightDidChanged:TextViewHeightDidChangedBlock){
    objc_setAssociatedObject(self, &TextViewHeightDidChangedBlockKey, textViewHeightDidChanged, objc_AssociationPolicy.OBJC_ASSOCIATION_COPY_NONATOMIC)
  }

  func textViewHeightDidChanged()->TextViewHeightDidChangedBlock?{
   let textChanged : ((CGFloat)->Void) = objc_getAssociatedObject(self, &TextViewHeightDidChangedBlockKey) as! TextViewHeightDidChangedBlock
    return textChanged
  }

}

但是它告诉我一个错误，提示：

But it tells me an error that says:

命令由于信号失败：分段错误：11。

Command failed due to signal: Segmentation fault: 11.

这是错误的图片

谁能告诉我原因并给我深刻的解释，非常感谢！

Can anyone tell me why and give me an deep meaningful explanation, thank you very much!

推荐答案

如果在类中声明 Bool！属性，并尝试使用此属性创建三元条件，也会出现此错误：

You can also have this error if you declare a Bool! property in a class and you try to make a ternary condition with this property:

var isSomething: Bool!

func myFunc() {
    let value = isSomething ? "something" : "not"
}

只需添加！在您的财产上

Just add the ! on your property

var isSomething: Bool!

func myFunc() {
    let value = isSomething! ? "something" : "not"
}

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