NSMutableArray--可变数组

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//
//  main.m
//  OC04-task-08
//
//  Created by Xin the Great on 15-1-24.
//  Copyright (c) 2015年 Xin the Great. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "Person.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        
        /////////////NSMutableArray--可变数组///////////
        
        //使用了父类的构造方法构造一个可变数组
        NSMutableArray *arr = [NSMutableArray array];
        
        //NSMutableArray自己的构造方法,表示初始化数组的容量大小，注意：这里只是为了代码的可读性
        NSMutableArray *arr0 = [NSMutableArray arrayWithCapacity:2];
        //添加元素（对象）
        /*
         Inserts a given object at the end of the array.
         */
        [arr0 addObject:@"1"];
        [arr0 addObject:@"2"];
        [arr0 addObject:@"3"];
        NSLog(@"arr0 is %@",arr0);

        //用父类的方法构造
        NSMutableArray *arr1 = [NSMutableArray arrayWithObjects:@"1",@"3", nil];
        NSLog(@"arr1 is %@",arr1);
        
        //向数组的末尾添加一个新元素
        [arr addObject:@"x"];
        NSLog(@"arr is %@", arr);
        
        //插入元素
        [arr1 insertObject:@"2" atIndex:1];
        [arr1 insertObject:@"0" atIndex:0];
        NSLog(@"arr1 is %@",arr1);
        
        //删除元素
        //删除最后一个元素
        [arr1 removeLastObject];
        NSLog(@"arr1 is %@",arr1);
        
        //删除指定下标元素
        [arr1 removeObjectAtIndex:1];
        NSLog(@"arr1 is %@",arr1);
        
        //删除指定元素 //如果元素不存在，则什么也不做
        [arr1 removeObject:@"2"];
        NSLog(@"arr1 is %@",arr1);

        //移除所有元素
        [arr1 removeAllObjects];
        NSLog(@"arr1 is %@",arr1);
        
        
        //添加多个元素
        NSMutableArray *arr2 = [NSMutableArray arrayWithObjects:@"1",@"2", nil];
        NSArray *lists = @[@"3",@"4",@"5",@"6"];
        [arr2 addObjectsFromArray:lists];
        NSLog(@"arr2 is %@",arr2);
        
        //替换和交换元素
        //根据传进来的对象替换下标的目标对象
        [arr2 replaceObjectAtIndex:2 withObject:@"7"];
        NSLog(@"arr2 is %@",arr2);
        //根据两个元素的下标交换元素
        [arr2 exchangeObjectAtIndex:2 withObjectAtIndex:5];
        NSLog(@"arr2 is %@",arr2);
        
        //扩展：
        Person *ps = [[Person alloc] init];
        ps.name = @"tom";
        ps.age = 10;
        
        //数组的遍历
        NSArray *arr3 = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",ps];
        //传统遍历法
        for (int i = 0; i < [arr3 count]; i++) {
            NSLog(@"arr3[%d] is %@",i, arr3[i]);
        }
        
        //快速遍历法
        for (id value in arr3) {
            //循环块
            if ([value isMemberOfClass:[Person class]]) {
                Person *ps = (Person *)value;
                NSLog(@"person name is %@",ps.name);
                continue;
            }
            NSLog(@"value is %@",value);
            
        }
        
        
        //mutableCopy
        NSArray *arr4 = @[@"1", @"2", @"3"];
        NSLog(@"arr4 is %@", arr4);
        NSMutableArray *arr5 = [arr4 mutableCopy];
        [arr5 addObject:@"4"];
        NSLog(@"arr5 is %@", arr5);
        
        
//        NSMutableArray *arr6 = [NSMutableArray arrayWithArray:arr4];
        
        
    }
    return 0;
}

NSMutableArray--可变数组

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原文地址：http://blog.csdn.net/zuojx1013/article/details/43163627