[英]Swift 4 NSTreeController @objc dynamic var nodes = [Node]() crashes app on start
After Swift 4 migration, my NSTreeController project now crashes on start. 在Swift 4迁移之后,我的NSTreeController项目现在在启动时崩溃。 I boiled it down to the casting of @objc to my dynamic array.
我将其归结为将@objc转换为动态数组。 Does anyone have any idea why it keeps causing the crash?
有谁知道为什么它继续导致崩溃?
@objc dynamic var nodes =[Node]() // The @objc is causing the crash
I figured out the problem. 我解决了这个问题。 It was when I did the Swift migration to 4 and selected the first option (recommended) which did not attach @objc property to variables that needed it.
这是当我将Swift迁移到4并选择第一个选项(推荐)时,该选项未将@objc属性附加到需要它的变量上。 Mainly my entire Node class needed @objc property on the variables, which the second option 'Match Swift 3 Behavior', did do and my desktop application ran without any crashes.
主要是我的整个Node类都需要变量的@objc属性,第二个选项“ Match Swift 3 Behavior”确实做到了,并且我的桌面应用程序运行时没有崩溃。
An example of the proper conversion from Swift 3 to 4 below for your Node class: 以下是您的Node类从Swift 3正确转换为4的示例:
class Node: NSObject, TreeNode {
@objc var name1: String
@objc var name2: String
@objc var name3: String?
@objc var children: [Node] = []
@objc init(name1: String, name2: String, name3: String) {
self.name1 = name1
self.name2 = name2
self.name3 = name3
}
@objc func addChild(node: Node) {
// add child function
}
@objc func findChild(node: Node) -> Node? {
// find child function
}
}
So for anyone running into this issue, when you convert to Swift 4, try using the 'Match Swift 3 Behavior' option. 因此,对于遇到此问题的任何人,当您转换为Swift 4时,请尝试使用“匹配Swift 3行为”选项。
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