Question

很抱歉，标题听起来很混乱。但我正在尝试制作一个具有表格视图的应用程序。每行都有自己的按钮，有自己的一组点。我非常希望按钮能够向计数器添加特定数量的点数。但是，我不知道如何访问所选行的NSArray的int。这是代码：

@interface FBViewController ()

@end

@implementation FBViewController {

    NSArray *tablePoints;
    NSArray *tablePointLabel;
    int counter;

}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    //A table that displays the points on the buttons
    tablePointLabel = [NSArray arrayWithObjects:
                   @"10",
                   @"10",
                   @"10",
                   @"20",
                   @"20",
                   @"20",
                   @"30",
                   @"30",
                   @"50",
                   @"70",
                   @"100",
                   @"300",
                   @"300",
                   nil];

    //table of ints (points)
    tablePoints = [NSArray arrayWithObjects:
                   @10,
                   @10,
                   @10,
                   @20,
                   @20,
                   @20,
                   @30,
                   @30,
                   @50,
                   @70,
                   @100,
                   @300,
                   @300,
                   nil];

    counter = 0;

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return [tableData count];
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *simpleTableIdentifier = @"FBCell";

    FBCell *cell = (FBCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil) {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"FBCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];
    }


    UIButton *pointButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    pointButton.frame = CGRectMake(250.0f, 5.0f, 75.0f, 30.0f);
    [pointButton setBackgroundColor:[UIColor greenColor]];
    [pointButton setTitle:[tablePointLabel objectAtIndex:indexPath.row] forState:UIControlStateNormal];
    [cell addSubview:pointButton];
    [pointButton addTarget:self
                    action:@selector(addPoint:)
              forControlEvents:UIControlEventTouchUpInside];


    return cell;
}

-(IBAction)addPoint:(id)sender {


    counter + [tablePoints objectAtIndex:indexPath.row] = counter; 
    **//This is where I have an issue. indexPath.row does not work for int arrays. what do i do???**


}

Answer 1

NSArray包含对象，而不是值。在您的情况下，它包含NSNumber对象，而NSNumber对象又保存值。

使用indexPath.row获取NSNumber，然后获取值。

NSNumber *numberObject = [tablePoints objectAtIndex:myIndex];
int myInt = [numberObject intValue]; // NSNumber covers a range of different types of values

一个问题是你在哪里获得indexPath.row并且在那时它是有效的。

Answer 2

很多方法可以改善这一点（包括rmaddy提供的建议）

我的建议不是实例化一个uibutton（我猜测是等于每个表行的高度/宽度，是实现

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//increments counte
counter += [tablePoints[indexPath.row] intValue];
}

此外，对于行标签，只需坚持uilabel，并为（UITableViewCell *）tableView：（UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath，根据数组值设置标签。实际上，您甚至不需要声明两个相同的数组，只需重新调整相同的数组。

如何从所选行的NSArray访问int？

2 个答案: