UIAlertView和UIActionSheet

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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]];

UIAlertView和UIActionSheet

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原文地址：http://www.cnblogs.com/sg6548676/p/4637788.html