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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