iOS TextField输入框点击键盘时随着键盘上移

-(void)textFieldDidBeginEditing:(UITextField *)textField

{

    CGRect frame = textField.frame;

    int offset = frame.origin.y + 70  - (self.view.frame.size.height -216.0);//iPhone键盘高度216，iPad的为352

    [UIView beginAnimations:@"ResizeForKeyboard" context:nil];

    [UIView setAnimationDuration:0.5f];

    //将视图的Y坐标向上移动offset个单位，以使下面腾出地方用于软键盘的显示

    if(offset > 0)

        self.view.frame = CGRectMake(0.0f, -offset,self.view.frame.size.width, self.view.frame.size.height);

    [UIView commitAnimations];

} 

//输入框编辑完成以后，将视图恢复到原始状态

-(void)textFieldDidEndEditing:(UITextField *)textField

{

    self.view.frame =CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);

}