objc_copyClassList:更新到iOS 13.4 / XCode 11.4后崩溃EXC_BAD_INSTRUCTION
objc_copyClassList:更新到iOS 13.4 / XCode 11.4后崩溃EXC_BAD_INSTRUCTION
提问于 2020-03-26 00:48:25
在更新到iOS 13.4 / XCode 11.4之后
这段代码
func getSubclassInfos() -> [ClassInfo] {
let superObject = CityModel.self
let superClassInfo = ClassInfo(superObject)
var subclassList = [ClassInfo]()
var count = UInt32(0)
guard let classList = objc_copyClassList(&count) else {
return subclassList
}
for i in 0..<Int(count) {
let clazz = classList[i] // Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
if let classInfo = ClassInfo(classList[i]),
let superclassInfo = classInfo.superclassInfo,
superclassInfo == superClassInfo
{
subclassList.append(classInfo)
}
}
return subclassList
}在模拟器中使用EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)在let clazz = classList[i]行中崩溃。
这一行不在我的原始代码中。此处显示的是下标崩溃，而不是ClassInfo(...)
你知道我能做什么吗？
(代码的灵感来自List all subclasses of one class)
Stack Overflow用户
回答已采纳
发布于 2020-03-26 01:23:04
刚刚注意到：classList是一个完全错误的词。返回结果类型为AutoreleasingUnsafeMutablePointer<AnyClass>?。首先将其转换为UnsafeBufferPointer<AnyClass>，然后对其进行处理：
func getSubclassInfos() -> [ClassInfo] {
let superObject = CityModel.self
let superClassInfo = ClassInfo(superObject)
var count = UInt32(0)
guard let classListPointer = objc_copyClassList(&count) else { return [] }
return UnsafeBufferPointer(start: classListPointer, count: Int(count))
.map(ClassInfo.init)
.filter { $0 == superClassInfo }
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/60853427
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