description.pointee.isGeneric代码崩溃stop reason = EXC_BAD_ACCESS

[misaka14]

杰哥，你好，想使用KakaJSON获取类的metadata数据，遇到一个崩溃

• 1、有一个OC的类WTStudent

@interface WTStudent : NSObject

@end

@interface WTPerson : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic, assign) NSUInteger age;
@property (nonatomic, strong) WTStudent *stu;
@end

• 2、Swift中的Student继承WTPerson

class Student: WTPerson {

}

• 3、获取Student的MetaData数据

let mt = Metadata.type(Student.self) as? ModelType

• 4、崩溃点

* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x2c)
    frame #0: 0x00007fff51b2c94d libsystem_platform.dylib`_platform_memmove$VARIANT$Haswell + 77
    frame #1: 0x0000000100b7398b Metadata扫描`__swift_memcpy60_4 at <compiler-generated>:0
  * frame #2: 0x0000000100b5276d Metadata扫描`NominalType<>.builtGenericTypes(self=0x00006000022f4630) at Type.swift:47:25
    frame #3: 0x0000000100b437c0 Metadata扫描`ClassType.build(self=0x00006000022f4630) at ClassType.swift:18:24
    frame #4: 0x0000000100b561a2 Metadata扫描`BaseType.init(name="WTPerson", type=WTPerson, kind=class, self=0x00006000022f4630) at BaseType.swift:22:9
    frame #5: 0x0000000100b6282e Metadata扫描`ModelType.init(name="WTPerson", type=WTPerson, kind=class) at <compiler-generated>:0
    frame #6: 0x0000000100b44b3b Metadata扫描`ClassType.init(name="WTPerson", type=WTPerson, kind=class) at <compiler-generated>:0
    frame #7: 0x0000000100b449bc Metadata扫描`ClassType.__allocating_init(name:type:kind:) at ClassType.swift:0
    frame #8: 0x0000000100b72c9d Metadata扫描`static Metadata.type(type=WTPerson, self=Metadata扫描.Metadata) at Metadata.swift:49:22
    frame #9: 0x0000000100b4390c Metadata扫描`ClassType.build(self=0x00006000022f45a0) at ClassType.swift:21:28
    frame #10: 0x0000000100b561a2 Metadata扫描`BaseType.init(name="Student", type=Metadata扫描.Student, kind=class, self=0x00006000022f45a0) at BaseType.swift:22:9
    frame #11: 0x0000000100b6282e Metadata扫描`ModelType.init(name="Student", type=Metadata扫描.Student, kind=class) at <compiler-generated>:0
    frame #12: 0x0000000100b44b3b Metadata扫描`ClassType.init(name="Student", type=Metadata扫描.Student, kind=class) at <compiler-generated>:0
    frame #13: 0x0000000100b449bc Metadata扫描`ClassType.__allocating_init(name:type:kind:) at ClassType.swift:0
    frame #14: 0x0000000100b72c9d Metadata扫描`static Metadata.type(type=Metadata扫描.Student, self=Metadata扫描.Metadata) at Metadata.swift:49:22
    frame #15: 0x0000000100b57001 Metadata扫描`AppDelegate.application(application=0x00007f8ffdf04e80, launchOptions=nil, self=0x00006000010f37c0) at AppDelegate.swift:20:27
    frame #16: 0x0000000100b57183 Metadata扫描`@objc AppDelegate.application(_:didFinishLaunchingWithOptions:) at <compiler-generated>:0

[czeludzki]

我也遇到了同样的问题... 这里需要父类也遵循 Convertible 协议才能可以哦 我的解决办法是, 不用kakajson解析, 甚至是遇到nsobject的对象, 都用mjextension

[wolfcon]

如果要使用 MJExtension 也已经给出了针对 Swift 的示例代码, 可以参考.