OC基础数据类型-NSValue

1、NSValue：将指针等复杂的类型存储为对象

 struct sct {
     int a;
     int b;
 }sctt;

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

判断NSValue存储的类型

 if(strcmp(value.objCType, @encode(struct sct)) == ){
     NSLog(@"It is struct sct");
 }

获取NSValue中结构体的数据

 //初始化sct的a、b
 struct sct {
     int a;
     int b;
 }sctt = {, };

 //获取NSValue中结构体的数据
 struct sct newSct;
 [value getValue:&newSct];
 NSLog(@"%d, %d", newSct.a, newSct.b);

 char * p = (char *)0x1f;
 NSValue * value = [[NSValue alloc] initWithBytes:&p objCType:@encode(char *)];

 char * q;
 [value getValue:&q];
 NSLog(@"%p", q);

结题！！！