objective-c - 错误: unrecognized selector sent to class

Question

对于 Objective C(甚至对于 OOP 而言)，我完全是个菜鸟。这就是我正在尝试做的事情

AInterface.m

@implementation AInterface

 - (BOOL)getParam:(NSData **)a param1:(NSData**)param1 param2:(NSData**)param2
{

       //Do a bunch of things
       return bool;
} 

@end

AInterface.h

@interface AInterface : NSObject

- (BOOL)getParam:(NSData **)a param1:(NSData**)param1 param2:(NSData**)param2;

+ (instancetype) inst;
@end

testMain.m()

int main()
{
    Bool result = NO;
    NSData *a = Nil;
    NSData *b = Nil;
    NSData *c = Nil;

    result = [[AInterface inst] getParam:(NSData **)&a param1:(NSData**)&a param2:(NSData**)&b];

    return result 
}

当我运行此命令时，我收到一条错误消息，提示失败:

 caught "NSInvalidArgumentException", "+[AInterface inst]: unrecognized selector sent to class 

Answer 1

尽管您在 @interface 部分声明了 +inst 方法，但您的类并未实现它，这会导致运行时错误。您需要添加实现才能使其工作，例如

@implementation AInterface
...
+ (instancetype)inst {
   return [self new];
}