我的app有一个问题。我正在构建一个具有导航控制器的应用程序。当我选择一个特定的行时，它的相关URL将被加载。它工作正常。但是如何从这个视图返回到前一个视图？我试图在视图顶部放置一个导航栏，但它不可见。请你帮帮我.....
我在selectrowmethod中放置了以下编码
（void）tableView：（UITableView *）tableView didSelectRowAtIndexPath：（NSIndexPath *）indexPath {
//获取所选国家/地区 NSString * selectedCountry = [listOfItems objectAtIndex：indexPath.row];
// NSString * url = @“”;
if（indexPath.row == 0）{
// url = @“http://www.osha.gov/dcsp/osp/stateprogs/alaska.html”; //label.text=url; 的NSLog（@ “==”）; NSURL * url = [[NSURL alloc] initWithString：@“http://labor.state.ak.us/lss/oshhome.htm”]; [[UIApplication sharedApplication] openURL：url]; // self.label.text = @“url”; // NSLog（@“++++++：％@”，self.label.text）; //textView.text = @ “URL”;
}
else if（indexPath.row == 1）{
NSURL * url = [[NSURL alloc] initWithString：@“http://www.ica.state.az.us/ADOSH/”]; [[UIApplication sharedApplication] openURL：url];
// URL = @ “http://www.osha.gov/dcsp/osp/stateprogs/arizona.html”; } else if（indexPath.row == 2）{
NSURL * url = [[NSURL alloc] initWithString：@“http://www.dir.ca.gov/occupational_safety.html”]; [[UIApplication sharedApplication] openURL：url];
// URL = @ “http://www.osha.gov/dcsp/osp/stateprogs/arizona.html”; }
else if（indexPath.row == 3）{
NSURL * url = [[NSURL alloc] initWithString：@“http://www.ctdol.state.ct.us/osha/osha.htm”]; [[UIApplication sharedApplication] openURL：url];
// URL = @ “http://www.osha.gov/dcsp/osp/stateprogs/arizona.html”; } }