IOS-UIAlertView和UIActionSheet
IOS中两大控件:UIAlertView和UIActionSheet
UIAlertView是在屏幕中央弹出一个消息框,该消息框可以用来做消息提示,也可以让用户选择不同选项。
UIActionSheet是在屏幕底端弹出一个消息框,功能类似UIAlertView,不过两者除了位置不一样外,其外观也有出入。为了能够响应UIAlertView和UIActionSheet,需要设定其代理,而对应的代理需要实现对应的协议(UIAlertViewDelegate,UIActionSheetDelegate)。实现以下两个函数
// Called when a button is clicked. The view will be automatically dismissed after this call returns - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex; // Called when a button is clicked. The view will be automatically dismissed after this call returns - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex;
示例代码
- 代理实现协议
@interface ViewController : UIViewController <UIAlertViewDelegate, UIActionSheetDelegate>
- 主要功能代码
-(IBAction)onTextFieldEnd:(id)sender { [_textTime resignFirstResponder]; // 显示对话框 #if 0 UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"TextContend" message:_textTime.text delegate:self cancelButtonTitle:@"OK" otherButtonTitles:@"Good", @"Thanks", nil]; [alert show]; [alert release]; #else // 底部弹出对话框 UIActionSheet* sheet = [[UIActionSheet alloc] initWithTitle:@"ActionSheet" delegate:self cancelButtonTitle:@"cancelButtonTitle" destructiveButtonTitle:@"destructiveButtonTitle" otherButtonTitles:@"OtherButton1", @"OtherButton2", nil]; [sheet showInView:self.view]; [sheet release]; #endif } // 按钮按下时响应函数 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { NSString* strInfo = nil; strInfo = [[NSString alloc] initWithFormat:@"你按下了【%@】按钮,第%d个按钮", [alertView buttonTitleAtIndex:buttonIndex], buttonIndex]; UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"按钮响应代理函数" message:strInfo delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show]; [alert release]; [strInfo release]; } // 按钮按下时响应函数 - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex { NSString* strInfo = nil; strInfo = [[NSString alloc] initWithFormat:@"你按下了【%@】按钮,第%d个按钮", [actionSheet buttonTitleAtIndex:buttonIndex], buttonIndex]; UIAlertView* alert = [[UIAlertView alloc]initWithTitle:@"按钮响应代理函数" message:strInfo delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show]; [alert release]; [strInfo release]; }
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