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##UIAlertView和UIActionSheet
```objc// cancelButton buttonIndex == 1// destructiveButton buttonIndex ?==0?UIActionSheet *sheet =[[UIActionSheet alloc]initWithTitle:@"确定注销吗" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"注销" otherButtonTitles:nil, nil];? ???[sheet showInView:self.view];
``````objc- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{? ? if (buttonIndex == 0) {? ? ? ? [self.navigationController popViewControllerAnimated:YES];? ? }? ??}```
/* * ?清空导航条背景图片，系统判断当前为NIL，但还是会再生成一张背景图片 ?*/? ? [self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc]init] forBarMetrics:UIBarMetricsDefault];? ??? ? /* * ?去掉分割线 ?*/? ? [self.navigationController.navigationBar ?setShadowImage:[[UIImage alloc]init]];

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原文地址：http://www.cnblogs.com/sg6548676/p/4637787.html