Objective-c 装箱和拆箱

//
//  main.m
//  KenshinCui
//
//  Created by hxd_mac on 15-6-7.
//  Copyright (c) 2015年 hxd198. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Person.h"
void Test1()
{
//基本数据类型装箱
//    +(NSNumber *)numberWithChar:(char)value;
//
//    +(NSNumber *)numberWithInt:(int)value;
//
//    +(NSNumber *)numberWithFloat:(float)value;
//
//    +(NSNumber *)numberWithDouble:(double)value;
//
//    +(NSNumber *)numberWithBool:(BOOL)value;
//
//    +(NSNumber *)numberWithInteger:(NSInteger)value;
//
//基本数据类型拆箱
//    -(char)charValue;
//
//    -(int)intValue;
//
//    -(float)floatValue;
//
//    -(double)doubleValue;
//
//    -(BOOL)boolValue;
//NSNumber 不能对结构体装箱
NSNumber *number = [NSNumber numberWithChar:'C'];

NSLog(@"number: %@", number);

NSArray *array = [NSArray arrayWithObject:number];

NSLog(@"array: %@", array);

NSLog(@"%c", number.charValue);
}
void Test2()
{
//常用的结构体Foundation已经为我们提供好了具体的装箱方法：

//    +(NSValue *)valueWithPoint:(NSPoint)point;
//
//    +(NSValue *)valueWithSize:(NSSize)size;
//
//    +(NSValue *)valueWithRect:(NSRect)rect;

//对应的拆箱方法：

//    -(NSPoint)pointValue;
//
//    -(NSSize)sizeValue;
//
//    -(NSRect)rectValue;
CGPoint point = CGPointMake(2.5, 4);

NSValue *value = [NSValue valueWithPoint:point];

NSLog(@"value: %@", value);

NSArray *array = [NSArray arrayWithObject:value];

NSLog(@"array: %@", array);

CGPoint point2 = [value pointValue];

NSLog(@"point.x = %.1f, point.y = %.1f", point2.x, point2.y );

}
typedef struct myDate{
int year;
int month;
int day;
}myDate;
void Test3()
{
//    自定义的结构体类型，使用以下方法进行装箱：
//
//    +(NSValue *)valueWithBytes:(const void *)value objCType:(const char *)type;
//
//    调用下面的方法进行拆箱：
//
//    -(void)getValue:(void *)value;
myDate date = {2015, 6, 8};

char *type = @encode(myDate);

NSValue *value = [NSValue valueWithBytes:&date objCType:type];

NSLog(@"value: %@", value);

NSArray *array = [NSArray arrayWithObject:value];

NSLog(@"array: %@", array);

myDate date2;

[value getValue:&date2];

NSLog(@"%d, %d, %d", date2.year, date2.month, date2.day);
}
void Test4()
{
//NSNull null单例 只有 null一个方法
NSNull *nul1 = [NSNull null];

NSNull *nul2 = [NSNull null];

NSLog(@"%@", (nul1 == nul2)?@"yes":@"no");

NSArray *array = [NSArray arrayWithObjects:@"a",nul1,@"b",nul2,nil];

NSLog(@"array: %@", array);

}
typedef enum {
sprint = 0,
summer,
autumn,
winter,
}seaSon;
void Test5()
{
// @符号用来装箱
NSNumber *number = @100;

NSArray *array = [NSArray arrayWithObjects:@10, @"string", number, @7.2, @'c', @YES, nil];

NSLog(@"array: %@", array);

NSNumber *num2 = @(1+2*3);

NSLog(@"num2: %@", num2);

NSNumber *num3 = @(winter);

NSLog(@"num3: %@", num3);

NSArray *arr2 = @[@YES, @"string", @'c', @7, @5.5];

NSLog(@"arr2[3]: %@", arr2[3]);

NSMutableArray *arr3 = [NSMutableArray arrayWithArray:arr2];

arr3[0] = @"mac";

NSLog(@"arr3[0] = %@", arr3[0]);

NSDictionary *dictionary = @{@1: @'a', @2: @'b', @3: @'c'};

NSLog(@"dictionary = %@", dictionary);

NSMutableDictionary *dic2 = [NSMutableDictionary dictionaryWithDictionary:dictionary];

dic2[@"1"] = @"yes";

NSLog(@"dic2[@\"1\"] = %@", dic2[@"1"]);

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

Test1();
Test2();
Test3();
Test4();
Test5();

}
return 0;
}