使用NSUInteger输入insertObject：___ atIndex：___

Question

我试图使用NSMutableArray创建一个简单的命令行tic-tac-toe游戏。

创建了一个名为＆＃34; Board＆＃34;用方法＆＃34; getPosition＆＃34; （我假设这是获取用户输入的最佳方式） 我要求的位置，然后从int转换为NSUInteger）

#import "Board.h"

@implementation Board

-(void)getPosition;
{
    int enteredPosition;
    scanf("%i", &enteredPosition);
    NSUInteger nsEnteredPosition = (NSUInteger ) enteredPosition;
    NSLog(@"Position = %lu", (unsigned long)nsEnteredPosition);
}



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


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

    @autoreleasepool {

        NSString *currentPlayer;
        NSMutableArray *gameBoard=[[NSMutableArray alloc] initWithCapacity:9];

        for(int i; i<=2; i++)
        {
            if(i %2)
            {
                currentPlayer=@"X";
            }
            else
            {
                currentPlayer=@"O";
            }

        NSLog(@"Player %@, select an open spot 1 - 9 on the board", currentPlayer);
        Board *currentPosition = [[Board alloc] init];
        [currentPosition getPosition];
        [gameBoard insertObject:currentPlayer atIndex:currentPosition]; //this is where i have a problem
        }

据我所知，atIndex需要一个NSUInteger参数，但我收到错误信息：

  

＆＃34;指向整数转换的不兼容指针发送＆＃39; Board * _strong＆＃34;   参数类型＆＃39; NSUInteger＆＃39; （又名＆＃39;未分配长＆＃39;）

Answer 1

您正在使用currentPosition作为Board对象的索引。也许[currentPosition getPosition]应该返回NSUInteger。如果是这样，请尝试重写代码的最后部分，如下所示：

Board *theBoard = [[Board alloc] init];
NSUInteger currentPosition = [theBoard getPosition];
[gameBoard insertObject:currentPlayer atIndex:currentPosition]; //this is where i have a problem