开关坏了，语法错误？

Question

出于某种原因，此 switch 语句不想识别我的视图控制器类名称或附加变量（IndexViewController 附加 indexVC）。如果我在常规的 if 或没有依赖语句中执行此操作，它确实会识别同一段代码。我实际上查阅了 switch 的语法，因为我认为我的思想泄漏了一些内存。但语法似乎没问题。有人可以指出我的错误吗？谢谢

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

switch (indexPath.row) {
    case 0:
        IndexViewController *indexVC = [self.storyboard instantiateViewControllerWithIdentifier:@"IndexViewController"];
        [self.currentVC presentViewController:indexVC animated:YES completion:nil];
        break;
    case 1:
        ProtectionViewController *proVC = [self.storyboard instantiateViewControllerWithIdentifier:@"ProViewController"];
        [self.currentVC presentViewController:proVC animated:YES completion:nil];
        break;
    case 2:
        UsersViewController *usersVC = [self.storyboard instantiateViewControllerWithIdentifier:@"UsersViewController"];
        [self.currentVC presentViewController:usersVC animated:YES completion:nil];
        break;
    case 3:
        StatisticsViewController *statisticsVC = [self.storyboard instantiateViewControllerWithIdentifier:@"StatisticsViewController"];
        [self.currentVC presentViewController:statisticsVC animated:YES completion:nil];
        break;

    default:
        NSLog(@"We dont beleive in defaults");
        break;
}

}

Answer 1

您需要赋予 case-local 变量作用域：

switch (indexPath.row) {
    case 0: {
        IndexViewController *indexVC = [self.storyboard instantiateViewControllerWithIdentifier:@"IndexViewController"];
        [self.currentVC presentViewController:indexVC animated:YES completion:nil];
        break;
    }
    case 1: {
        ...
    }
    ...

添加大括号。

开关坏了，语法错误？

switch gone bad, syntax error?

switch-statement

ios