解决textField中键盘挡住的问题

#pragma mark - 

#pragma mark - 解决键盘挡住的问题

//这是textfield的delegate，编辑开始网上偏移

-(void)textFieldDidBeginEditing:(UITextField *)textField

{

    [self animateTextField:textField up:YES];

}

//编辑结束恢复原来的位置

- (void)textFieldDidEndEditing:(UITextField *)textField

{

    [self animateTextField:textField up:NO];

}

//判断向上还是向下便宜，实现效果

-(void)animateTextField:(UITextField *)textField up:(BOOL)up

{

    const int movementDistance = 30;

    const float movementDuration = 0.3f;

    int movement = (up?-movementDistance:movementDistance);

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

    [UIView setAnimationBeginsFromCurrentState:YES];

    [UIView setAnimationDuration:movementDuration];

    self.view.frame = CGRectOffset(self.view.frame, 0, movement);

    [UIView commitAnimations];

}