Objective-C:NSValue類的常見用法

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特殊類型的封裝類：數組、結構體(OC內部的、自訂的)、指標

 1 // 2 //  main.m 3 //  05-NSValue 4 // 5 //  Created by ma c on 15/8/17. 6 //  Copyright (c) 2015年 bjsxt. All rights reserved. 7 // 8  9 #import <Foundation/Foundation.h>10 typedef struct11 {12     char *name;13     int age;14     char gender;15 }Student;16 17 int main(int argc, const char * argv[])18 {19     @autoreleasepool20     {21         //NSValue測試22         //1.指標23         int num = 10;24         int *p = &num;25         NSValue *value1 = [NSValue valueWithPointer:p];26         int *p2 = (int*)[value1 pointerValue];27         NSLog(@"num = %d",*(p2));28         29         //2.數組30         int arr[5] = {1,2,3,4,5};31         NSValue *value2 = [NSValue valueWithPointer:arr];32         int *p3 = (int*)[value2 pointerValue];33         for(int i=0; i<5; i++)34         {35             NSLog(@"%d",p3[i]);36         }37         38         //3.Foundation中常用的結構體:NSRange\NSRect\NSSize\NSPoint39         NSRange range = NSMakeRange(0, 5);40         NSValue *value3 = [NSValue valueWithRange:range];41         NSRange range2 = [value3 rangeValue];42         NSLog(@"%@",NSStringFromRange(range2));43         44         NSRect rect = NSMakeRect(0, 0, 100, 100);45         NSValue *value4 = [NSValue valueWithRect:rect];46         NSRect rect2 = [value4 rectValue];47         48         NSLog(@"%@",NSStringFromRect(rect2));49         50         51         //4.自訂的結構體52         Student stu = {"Tom",20,‘M‘};53         NSValue *value5 = [NSValue valueWithBytes:&stu objCType:@encode(Student)];54         NSLog(@"%s",@encode(Student));55         56         Student stu2;57         [value5 getValue:&stu2];58         NSLog(@"name = %s,age = %i,gender = %c",stu2.name,stu2.age,stu2.gender);59     }60     return 0;61 }

 

Objective-C:NSValue類的常見用法