OC基础数据类型-NSValue

1、NSValue：将指针等复杂的类型存储为对象

1 struct sct {

2     int a;

3     int b;

4 }sctt;

1 NSValue * value = [[NSValue alloc] initWithBytes:&sctt objCType:@encode(struct sct)];

判断NSValue存储的类型

1 if(strcmp(value.objCType, @encode(struct sct)) == 0){

2     NSLog(@"It is struct sct");

3 }

获取NSValue中结构体的数据

 1 //初始化sct的a、b

 2 struct sct {

 3     int a;

 4     int b;

 5 }sctt = {4, 5};

 6 

 7 //获取NSValue中结构体的数据

 8 struct sct newSct;

 9 [value getValue:&newSct];

10 NSLog(@"%d, %d", newSct.a, newSct.b);

1 char * p = (char *)0x1f;

2 NSValue * value = [[NSValue alloc] initWithBytes:&p objCType:@encode(char *)];

3 

4 char * q;

5 [value getValue:&q];

6 NSLog(@"%p", q);

 

结题！！！