Objective-C:NSValue类的常见用法

//
//  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 = #
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:NSRange\NSRect\NSSize\NSPoint
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;
}