OC 入门实现登陆验证

#import <Foundation/Foundation.h>
@interface CZLogin : NSObject{
    char *_username;
    char *_password;
}
-(BOOL)validateUserName:(NSString *)username andValidatePassword:(NSString *)password;
@end

@implementation CZLogin

-(BOOL)validateUserName:(NSString *)username andValidatePassword:(NSString *)password{
    if (username == nil || [username isEqualTo:@""] ) {
        NSLog(@"username can be not null");
        return NO;
    }
    if (password == nil || [password isEqualTo:@""] ) {
        NSLog(@"password can be not null");
        return NO;
    }

    if([username isEqualTo:@"admin"] && [password isEqualTo:@"admin"]){
        NSLog(@"login success");
        return YES;
    }
    return NO;
}

@end

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

    @autoreleasepool {

        CZLogin *login = [CZLogin new];
        [login validateUserName:@"admin" andValidatePassword:@"admin"];
        NSLog(@"Hello, World!");

    }
    return 0;
}