.h代码

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UITextFieldDelegate>
{int i_offset;    //偏移量int i_textFieldY;          //textField 的y 值int i_textFieldHeight;    //textField的高度IBOutlet UITextField *uitf_textField1;IBOutlet UITextField *uitf_textField2;IBOutlet UITextField *uitf_textField3;
}@end

#import "ViewController.h"#define StautsBarHeight 20.0f@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad
{[super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.uitf_textField1.delegate = self;uitf_textField2.delegate = self;uitf_textField3.delegate = self;i_offset = 0;    //默认偏移量为0i_textFieldY = 0;  i_textFieldHeight = 0;//注册键盘监听消息
    [self registerKeyBoardNotification];}- (void)viewDidUnload
{[super viewDidUnload];// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}#pragma mark- UITextFieldDelegateMethod- (void)textFieldDidBeginEditing:(UITextField *)textField
{        NSLog(@"进入textFieldDidBeginEditing");  i_textFieldY = textField.frame.origin.y;i_textFieldHeight = textField.frame.size.height;}- (BOOL)textFieldShouldReturn:(UITextField *)textField
{            [textField resignFirstResponder];return YES;
}#pragma mark- 键盘通知事件 ［核心代码］//注册键盘监听消息
-(void)registerKeyBoardNotification
{//增加监听，当键盘出现或改变时收出消息    ［核心代码］
    [[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillShow:)name:UIKeyboardWillShowNotificationobject:nil];//增加监听，当键退出时收出消息
    [[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(keyboardWillHide:)name:UIKeyboardWillHideNotificationobject:nil];// 键盘高度变化通知，ios5.0新增的
#ifdef __IPHONE_5_0float version = [[[UIDevice currentDevice] systemVersion] floatValue];if (version >= 5.0) {[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillChangeFrameNotification object:nil];}
#endif
}//当键盘出现或改变时调用
- (void)keyboardWillShow:(NSNotification *)aNotification
{//获取键盘的高度NSDictionary *userInfo = [aNotification userInfo];NSValue *aValue = [userInfo objectForKey:UIKeyboardFrameEndUserInfoKey];CGRect keyboardRect = [aValue CGRectValue];int keyboardHeight = keyboardRect.size.height;//计算偏移量i_offset = keyboardHeight - (self.view.frame.size.height-(i_textFieldY+i_textFieldHeight));//进行偏移NSTimeInterval animationDuration = 0.30f;                [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];                [UIView setAnimationDuration:animationDuration];float width = self.view.frame.size.width;                float height = self.view.frame.size.height;  if(i_offset > 0)                                         {CGRect rect = CGRectMake(0.0f,StautsBarHeight-i_offset,width,height); //把整个view 往上提，肯定要用负数 y                self.view.frame = rect;        }  [UIView commitAnimations];
}//当键退出时调用
- (void)keyboardWillHide:(NSNotification *)aNotification
{if(i_offset > 0)                                         {//恢复到偏移前的正常量NSTimeInterval animationDuration = 0.30f;                [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];                [UIView setAnimationDuration:animationDuration];float width = self.view.frame.size.width;                float height = self.view.frame.size.height;  CGRect rect = CGRectMake(0.0f,StautsBarHeight,width,height); //把整个view 往上提，肯定要用负数 y   注意self.view 的y 是从20开始的，即StautsBarHeight self.view.frame = rect;  [UIView commitAnimations]; }  i_offset = 0;
}