1223.2——数组的相关操作

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

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Person *xw = [[Person alloc] init];
        Person *zs = [[Person alloc] init];
        Dog *ww =[[Dog alloc] init];
        Dog *hz =[[Dog alloc] init];
        
        //数组的创建
        NSArray *array = @[@"pxd", xw, zs, ww, hz];
        NSArray *array2 = @[array, @"zp", @"wc"];
        NSLog(@"%@", array2);
        
        //创建一个空的数组
        NSArray *array3 = [NSArray array];
        NSArray *array4 = [[NSArray alloc] init];
        
        NSArray *array5 = [NSArray arrayWithArray:array];
        NSArray *array6 = [[NSArray alloc] initWithArray:array];
        
        NSArray *array7 = [NSArray arrayWithObject:xw];
        
        //创建的时候初始化一部分数据
        //数据结尾为nil 不能向数组里面添加一个值为nil的对象
        NSArray *array8 = [NSArray arrayWithObjects:xw, zs, nil];
        NSArray *array8_1 = [[NSArray alloc] initWithObjects:xw, zs, nil];
        NSLog(@"....%@", array8);
        
        //1.获取数组元素个数 count
        NSLog(@"the count of array8 is %ld", [array8 count]);
        
        //2.访问数组里面的某个元素 使用索引值访问index
        Person *temp = [array8 objectAtIndex:0];
        
        //3.获取数组里面的最后一个元素
        Person *temp2 = [array8 lastObject];
        Person *temp3 = [array8 firstObject];
        
        //4.如何遍历一个数组
        for (int i = 0; i < array8.count; i++){
            NSLog(@"%@", [array8 objectAtIndex:i]);
        }
        
        //使用快速循环
        for (Person *p in array8){
            NSLog(@"%@", p);
        }
        
        //获取一个对象的索引值
        NSInteger index = [array8 indexOfObject:@"pxdafafa"];
        NSLog(@"index:%ld", index);
        
        //判断数组里面是否包含某个元素
        if ([array8 containsObject:@"pxdadfafa"]) {
            NSLog(@"YES");
        } else{
            NSLog(@"NO");
        }
        
        //NSMutableArray可变数组
        NSMutableArray *marray1 = [NSMutableArray array];
        NSMutableArray *mArray = [NSMutableArray arrayWithCapacity:3];
        
        //增加一个元素
        [mArray addObject:xw];
        [mArray addObject:zs];
        
        //交换元素
        [mArray exchangeObjectAtIndex:0 withObjectAtIndex:1];
        
        //插入一个元素
        [mArray insertObject:array5 atIndex:0];
        NSLog(@"%@", mArray);
        
        //删除一个元素
        [mArray removeObject:xw];
        [mArray removeObjectAtIndex:0];
        NSLog(@"%@", mArray);
        
        //删除所有
        [mArray removeAllObjects];
        
    }
    return 0;
}