不使用xib切换界面(切换viewcontroller)
ThreeViewController* wuGuan=[[ThreeViewControlleralloc]init];
[self.navigationControllerpushViewController:wuGuananimated:NO];
[wuGuan release];
使用xib切换界面(切换viewcontroller)
TWOViewController* wuGuan=[[TWOViewControlleralloc]initWithNibName:@"TWOViewController"bundle:nil];
[self.navigationControllerpushViewController:wuGuananimated:NO];
[wuGuanrelease];