-(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);
}