objective-c - 进行类扩展时避免警告

Question

我想做以下事情:

@interface UINavigationController ()

-(void)removeFromNavigationStack:(Class)aClass;

@end

在 .m 文件中

@implementation UINavigationController

-(void)removeFromNavigationStack:(Class)aClass {

}

但是在 .m 文件中有很多警告，例如“找不到'initWithRootViewController:'的方法定义”

如何避免这种情况？我尝试过包含但仍然有警告

谢谢

Answer 1

由于您正在处理 UIKit 类 UINavigationController，因此您可能想要使用类别。扩展需要在类实现的主 @implementation block 中定义，并且您无权访问 UINavigationController

来自docs :

Class extensions are like anonymous categories, except that the methods they declare must be implemented in the main @implementation block for the corresponding class. Using the Clang/LLVM 2.0 compiler, you can also declare properties and instance variables in a class extension.