警示框

点击按钮弹出警示框

- (IBAction)login:(UIButton *)sender {    UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"输入账号密码" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];//delegate属性赋值为self，也就是view controller,所以在view controller中需要实现代理功能，就是alert view: :    alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;    [alert show];}- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    switch (buttonIndex) {        case 0:            NSLog(@"Cancel button clicked");            break;        case 1:{            NSLog(@"OK button clicked");            UITextField * text1 = [alertView textFieldAtIndex:0];            UITextField * text2 = [alertView textFieldAtIndex:1];            NSLog(@"账号为：%@",text1.text);            NSLog( @"%@",text2.text);            _textt.text = text1.text;            //_textt.textContainer = text2.text            //[_textt.text stringByAppendingFormat:@"%@",text2.text];            //取警示框上的数据            break;        }        default:            break;    }}//不断弹出-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{//这里弹出一个警示框的时候，点击确定时，又会调用委托对象的方法，而此处委托用的是和前一个委托相同，所以会调用相同的方法，报错    UIAlertView * alert1 = [[UIAlertView alloc]initWithTitle:@"密码错误！！！" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];    alert1.alertViewStyle = UIAlertViewStyleDefault;    [alert1 show];//    UITextView    //下面是自己写的，搞恶作剧用，不断弹出警示框，可以写上各种信息，最后来一个自动关机之类的动作。    UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"输入账号密码" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];    alert.alertViewStyle = UIAlertViewStyleLoginAndPasswordInput;        [alert show];}