-(void)textFieldDidBeginEditing:(UITextField *)textField
{
CGRect frame = textField.frame;
int offset = frame.origin.y + 70 - (self.view.frame.size.height -216.0);//iPhone鍵盤高度216，iPad的為352
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:0.5f];
//將視圖的Y坐標向上移動offset個單位，以使下面騰出地方用於軟鍵盤的顯示
if(offset > 0)
self.view.frame = CGRectMake(0.0f, -offset,self.view.frame.size.width, self.view.frame.size.height);
[UIView commitAnimations];
}
//輸入框編輯完成以后，將視圖恢復到原始狀態
-(void)textFieldDidEndEditing:(UITextField *)textField
{
self.view.frame =CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height);
}