Ios Xcode 9.0测试版:swift“;无法初始化类对象";调用Type.init()时
我刚升级到Xcode 9.0测试版,现在我的应用程序在发布时崩溃了Ios Xcode 9.0测试版:swift“;无法初始化类对象";调用Type.init()时,ios,swift,xcode,swift3,xcode9-beta,Ios,Swift,Xcode,Swift3,Xcode9 Beta,我刚升级到Xcode 9.0测试版,现在我的应用程序在发布时崩溃了 2017-06-09 14:35:18.817213-0700 recharge-consumer-ios[13524:1720597] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[recharge_consumer_ios.SignedOutContainerViewController&l
2017-06-09 14:35:18.817213-0700 recharge-consumer-ios[13524:1720597] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[recharge_consumer_ios.SignedOutContainerViewController<0x105c691b8> init]: cannot init a class object.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010caf4f6b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010ba3e121 objc_exception_throw + 48
2 CoreFoundation 0x000000010cb7f6ff +[NSObject(NSObject) init] + 127
3 recharge-consumer-ios 0x0000000105322223 _T021recharge_consumer_ios22RechargeViewControllerCACycfCTD + 19
其中MyViewControllerProtocol
是:
protocol MyViewControllerProtocol {
// some other fields here too
init()
}
class MyViewController: UIViewController, MyViewControllerProtocol {
required init() {
fatalError("init has not been implemented")
}
init(nibName nibNameOrNil: String?) {
super.init(nibName: nibNameOrNil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
失败的实例如下所示:
class SignedOutContainerViewController: MyViewController {
required init() {
super.init(nibName: "SignedOutContainerViewController")
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
其中MyViewController
为:
protocol MyViewControllerProtocol {
// some other fields here too
init()
}
class MyViewController: UIViewController, MyViewControllerProtocol {
required init() {
fatalError("init has not been implemented")
}
init(nibName nibNameOrNil: String?) {
super.init(nibName: nibNameOrNil, bundle: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
你知道哪里出了问题,或者有没有其他地方的指示?Xcode 9.0 Beta(9M136h),swift 3。使用@objc作为崩溃的方法我想跟进,因为接受的答案对我不起作用。所有这些都是从2017年6月12日开始在操场上使用swift 4.0开发快照工具链对Xcode进行测试的 这将失败,并出现运行时异常
import Foundation
public protocol MyProtocol {
init()
}
@objc // This doesn't work
public class MyClass: NSObject, MyProtocol {
@objc // This doesn't work either
required public override init() {
super.init()
}
}
let anonymousType: AnyClass = MyClass.self
let metaType: MyProtocol.Type = anonymousType as! MyProtocol.Type
let instance = metaType.init()
对我来说,这并不像用@objc
标记类或方法那么简单。我找到了两个适合我的解决方案
import Foundation
public protocol MyProtocol {
init()
}
final public class MyClass: NSObject, MyProtocol {
required public override init() {
super.init()
}
}
let anonymousType: AnyClass = MyClass.self
let metaType: MyProtocol.Type = anonymousType as! MyProtocol.Type
let instance = metaType.init()
import Foundation
@objc
public protocol MyProtocol {
init()
}
public class MyClass: NSObject, MyProtocol {
required public override init() {
super.init()
}
}
let anonymousType: AnyClass = MyClass.self
let metaType: MyProtocol.Type = anonymousType as! MyProtocol.Type
let instance = metaType.init()
无需复制,请向我们展示您如何声明一致性类以及如何调用该方法。@Kevin更新了完整的层次结构。调用是第一个代码块中的“type.init()”。如果改用
MyViewController.type
,它还会崩溃吗?@PauloMattos没有,但我的想法是,我通过调用SetAndRefreshChildViewControllers来控制我的应用程序流,这些类型具有实现MyViewControllerProtocol的各种ViewControllers数组。所以只有使用MyViewController才能达到目的。@Eric…是的,我明白;)我希望所有视图控制器都是MyViewController
子类,就像示例中的signedoutcontainerservicewcontroller
,因此使用超类或协议元类型没有多大关系。