OC基礎數據類型-NSValue

1、NSValue：將指針等復雜的類型存儲為對象

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

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

判斷NSValue存儲的類型

if(strcmp(value.objCType, @encode(struct sct)) == 0){
    NSLog(@"It is struct sct");
}

獲取NSValue中結構體的數據

//初始化sct的a、b
struct sct {
    int a;
    int b;
}sctt = {4, 5};

//獲取NSValue中結構體的數據
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);

 

結題！！！