Object -C NSValue -- 笔记

//

//  main.m

//  NSValue

//

//  Created by facial on 26/8/15.

//  Copyright (c) 2015 facial_huo. All rights reserved.

//

#import <Foundation/Foundation.h>

struct sct {

int a;

int b;

}test;

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

@autoreleasepool {

// insert code here...

NSLog(@"Hello, World!");

NSString *str = @"hey you";

//把字符串转换成nsdata类型

NSData * data = [str dataUsingEncoding:NSUTF8StringEncoding];

NSLog(@"%s", data.bytes); // 输出hey you

//把NSData转换成string类型

NSString *newStr = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];

NSLog(@"%@", newStr);

}

return 0;

}