Question

我有一个包含多个产品的NSMutableArray。每种产品都有一定数量。我想在单击步进器时更新相关产品的数量。但我的所有产品（整个NSMutableArray）都使用步进器的数量进行更新。

    NSInteger index = stepper.tag;

    Product *p = [products objectAtIndex:index];
    p.amount = [NSNumber numberWithDouble:stepper.value];
   //    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%d", stepper.tag] message:@"test" delegate:nil cancelButtonTitle:@"ok"otherButtonTitles:nil];
   //    [alert show];

   for (Product *p in products) {
       UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:@"%@", p.amount] message:p.name delegate:nil cancelButtonTitle:@"ok"otherButtonTitles:nil];
       [alert show];
   }

有没有人有解决方案？

Answer 1

由于Product * p是一个指针，因此您不必删除并重新插入数组。您只需修改产品即可。试试这个：

NSInteger index = stepper.tag;

Product *p = [products objectAtIndex:index];
p.amount = [NSNumber numberWithDouble:stepper.value];

索引上的对象更新整个nsmutablearray

1 个答案: