Objective-C:NSValue类的常见用法

特殊类型的包装类：数组、结构体(OC内部的、自定义的)、指针

//
//  main.m
//  05-NSValue
//
//  Created by ma c on 15/8/17.
//  Copyright (c) 2015年. All rights reserved.
//

#import <Foundation/Foundation.h>
typedef struct
{
    char *name;
    int age;
    char gender;
}Student;

int main(int argc, const char * argv[])
{
    @autoreleasepool
    {
        //NSValue测试
        //1.指针
        int num = 10;
        int *p = &num;
        NSValue *value1 = [NSValue valueWithPointer:p];
        int *p2 = (int*)[value1 pointerValue];
        NSLog(@"num = %d",*(p2));
        
        //2.数组
        int arr[5] = {1,2,3,4,5};
        NSValue *value2 = [NSValue valueWithPointer:arr];
        int *p3 = (int*)[value2 pointerValue];
        for(int i=0; i<5; i++)
        {
            NSLog(@"%d",p3[i]);
        }
        
        //3.Foundation中常用的结构体:NSRangeNSRectNSSizeNSPoint
        NSRange range = NSMakeRange(0, 5);
        NSValue *value3 = [NSValue valueWithRange:range];
        NSRange range2 = [value3 rangeValue];
        NSLog(@"%@",NSStringFromRange(range2));
        
        NSRect rect = NSMakeRect(0, 0, 100, 100);
        NSValue *value4 = [NSValue valueWithRect:rect];
        NSRect rect2 = [value4 rectValue];
        
        NSLog(@"%@",NSStringFromRect(rect2));
        
        
        //4.自定义的结构体
        Student stu = {"Tom",20,'M'};
        NSValue *value5 = [NSValue valueWithBytes:&stu objCType:@encode(Student)];
        NSLog(@"%s",@encode(Student));//输出结构体类型
        
        Student stu2;
        [value5 getValue:&stu2];
        NSLog(@"name = %s,age = %i,gender = %c",stu2.name,stu2.age,stu2.gender);
    }
    return 0;
}