OC 类方法的调用

代码：

#import <Foundation/Foundation.h>
@interface Dog:NSObject{
  @public
    NSString *_name;
    int _age;
}
+(void)eat:(NSString *) food;
@end
@implementation Dog

+(void)eat:(NSString *) food{
    NSLog(@"dog eat %@",food);
}

@end
int main(int argc, const char * argv[])
{

    @autoreleasepool {

        [Dog eat:@"gutou"];

    }
    return 0;
}

图解：