使用switch报错：Expected expression

使用switch，写如下的代码时：

int type = 0;
switch (type) {
    case 0:
        ViewController *vc = [ViewController new];
        [self.navigationController pushViewController:vc animated:YES];
        break;
    default:
        break;
}

Xcode会提示错误：Expected expression

解决办法：在case块开始与结尾加入花括号{ }，如下

int type = 0;
switch (type) {
    case 0:
    {
        ViewController *vc = [ViewController new];
        [self.navigationController pushViewController:vc animated:YES];
    }
        break;
    default:
        break;
}

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