一个简单的登录功能，遇到最大的问题就是怎么处理弹出的键盘，如何让它下去，这是一个首先要处理的问题。

ViewController.h:

#import <UIKit/UIKit.h>  @interface DXWViewController : UIViewController  - (IBAction)OKClick:(id)sender; - (IBAction)cancleClick:(id)sender; @property (retain, nonatomic) IBOutlet UILabel *label; - (IBAction)end:(id)sender;//键盘退出方法 @property (retain, nonatomic) IBOutlet UITextField *name; @property (retain, nonatomic) IBOutlet UITextField *password;  @end

ViewController.m:

#import "DXWViewController.h"  @interface DXWViewController ()  @end  @implementation DXWViewController  - (void)viewDidLoad {     [super viewDidLoad];     //view一加载就让输入框成为第一响应者     [self.name becomeFirstResponder]; }  - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning]; }  - (IBAction)OKClick:(id)sender {     NSString *strName = self.name.text;     NSString *strPwd = self.password.text;     self.label.text = [NSString stringWithFormat:@"姓名：%@，密码：%@",strName,strPwd];     //根据字的长度来设置label的大小，而不是用autolayerout来实现     CGSize size = [self.label.text sizeWithFont:self.label.font];     CGRect frame = CGRectMake(self.label.frame.origin.x,self.label.frame.origin.y, size.width, self.label.frame.size.height);     self.label.frame = frame; }  - (IBAction)cancleClick:(id)sender { } - (void)dealloc {     [_label release];     [_name release];     [_password release];     [super dealloc]; } - (IBAction)end:(id)sender {     [self.name resignFirstResponder];     [self.password resignFirstResponder]; } @end