题目-字典

#import <Foundation/Foundation.h>

@interface Person : NSObject

@property (nonatomic, copy) NSString *userName;
@property (nonatomic, copy) NSString *password;
@property (nonatomic, copy) NSString *phone;
@property (nonatomic) NSInteger age;

//...

@end

#import "Person.h"

@implementation Person


@end

#import <Foundation/Foundation.h>
#import "Person.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSDictionary *dic = @{@"abc":@"123", @"gcd":@"456"};
        
        NSLog(@"%@", dic);
        NSString *userName = @"abc";
        NSString *passowrd = @"123";
        
        if ([dic objectForKey:userName] == nil)
        {
            NSLog(@"用户名不存在");
        }
        else
        {
            //判断密码是否正确
            if ([passowrd isEqualToString:[dic objectForKey:userName]])
            {
                NSLog(@"登陆成功");
            }
            else
            {
                NSLog(@"密码错误");
            }
        }
        
        
        //2....
        Person *p1 = [[Person alloc] init];
        p1.userName = @"abc";
        p1.password = @"123";
        p1.phone = @"1111111";
        Person *p2 = [[Person alloc] init];
        p2.userName = @"gcd";
        p2.password = @"123";
        p2.phone = @"2222222";
        
        NSDictionary *userDic = @{p1.userName:p1, p2.userName:p2};
        NSLog(@"%@", userDic);
        
        //先把对象取出来
        Person *p = [userDic objectForKey:userName];
        
        if (p == nil)
        {
            NSLog(@"用户名不存在");
        }
        else
        {
            //判断密码是否正确
            
            if ([passowrd isEqualToString:p.password])
            {
                NSLog(@"登陆成功");
                NSLog(@"%@", p.phone);
            }
            else
            {
                NSLog(@"密码错误");
            }
        }
        
        
        
        
        
        
        
        
        
        
        
        
        
    }
    return 0;
}