#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

    @autoreleasepool {

        //NSArray的初始化以及常用数组操作方法简单归纳

        //不可变数组

        //数组的元素只能是对象，如果是int和float的话，就用NSNumber转换一下才能用

        //初始化的几种方式，可以一个元素、多个元素、从已有组复制、从文件、网址等

        NSArray *arr1 = [NSArray arrayWithObject:@"hello"];

        for (id a in arr1) {

            NSLog(@"%@",a);

        }

        //向数组对象初始化赋值，这里可以写任意对象的指针，结尾必须使用nil

        NSArray *arr2 = [NSArray arrayWithObjects:@"hello",@"world", nil];

        for (id b in arr2) {

            NSLog(@"%@",b);

        }

        //定义指定类型的数组

        NSString *str[3];

        NSNumber *num[3];

        //初始化数组元素赋值

        str[0] = @"hello";

        str[1] = @"world";

        str[2] = @"!";

        num[0] = [[NSNumber alloc] initWithInt:1];

        num[1] = [[NSNumber alloc] initWithInt:2];

        num[2] = [[NSNumber alloc] initWithInt:3];

        NSArray *arr3 = [NSArray arrayWithObjects:str count:3];

        NSArray *arr4 = [NSArray arrayWithObjects:num count:3];

        //遍历数组方法一

        for (id strr in arr3) {

            NSLog(@"%@",strr);

        }

        //遍历数组方法二

        for (int i = 0; i < [arr4 count]; i++) {

            NSLog(@"%@",[arr4 objectAtIndex:i]);

        }

        //复制数组

        NSArray *arr5 = [NSArray arrayWithArray:arr4];

        for (NSNumber *c in arr5) {

            NSLog(@"%@",c);

        }

        //给数组增加新元素(对象)

        NSArray *newArr5 = [arr5 arrayByAddingObject:@"Augus"];

        for (int i = 0 ; i < [newArr5 count]; i++) {

            if (i == [newArr5 count] - 1) {

                NSLog(@"%@",[newArr5 objectAtIndex:i]);

            }

        }

        //把数组里元素利用连接符连接成字符串

        NSString *strNew = [arr5 componentsJoinedByString:@"-"];

        NSLog(@"%@",strNew);

        //查询数组中是否包含某一元素，YES和NO

        BOOL isContain = [arr3 containsObject:@"hello"];

        NSLog(@"%d",isContain);

        //查询并返回位置，如没有则为NSNotFound

        NSInteger index = [arr3 indexOfObject:@"!"];

        NSString *indexF = [NSString stringWithFormat:@"%ld",index];

        NSInteger indexN = [indexF integerValue];//类型转换

        NSLog(@"%ld",indexN);

        //获取最后一个元素

        NSString *lastEle = [arr3 lastObject];

        NSLog(@"%@",lastEle);

        //可变数组，5个元素

        NSMutableArray *mutArr = [[NSMutableArray alloc] initWithCapacity:5];

        //添加一个元素

        [mutArr addObject:@"hello"];

        [mutArr addObject:[NSNumber numberWithInt:66]];

        [mutArr addObject:@"Augus"];

        [mutArr addObject:[NSNumber numberWithDouble:19.9]];

        //指定位置插入一个元素

        [mutArr insertObject:@"world" atIndex:1];

        //移除数组的元素，按名称、按序号等

        NSLog(@"%@",mutArr);

        [mutArr removeLastObject];

        NSLog(@"%@",mutArr);

        //替换元素

        [mutArr replaceObjectAtIndex:2 withObject:@"!"];

        NSLog(@"%@",mutArr);

        //把一个数组添加到另一个里,实际上就是把数组里的元素都添加进去了

        [mutArr addObjectsFromArray:arr4];

        NSLog(@"%@",mutArr);

        NSLog(@"%ld",[mutArr count]);

    }

    return 0;

}