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//返回到上一界面 -(void)customBackBtnPressed:(id)send{ UIAlertView *alertView= [[UIAlertView alloc] initWithTitle:@"温馨提示" message:@"还差一步就完成注册! 确定放弃?" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定",nil]; [alertView show]; } //通常用的这个代理方法来做 发现键盘在popViewControllerAnimated后会重新出现 - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{ if (buttonIndex==1) { [self.navigationController popViewControllerAnimated:YES]; } } //百思不得其姐后,后了下面这个代理方法,竟然键盘不出现了! - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex { if (buttonIndex==1) { [self.navigationController popViewControllerAnimated:YES]; } }