CODEWITHSUNDEEP
iosobjective-cuiscrollview
Junior Bill gates
Junior Bill gates

Reputation: 1866

Implementing scroll View in ios for a particular case

In my app i have 8 Text-fields.I have implemented scrollview when keyboard appears,but when i start entering text in the 1st textfield the view scrolls and it hides my current focused Text-field.I want that the scroll should happen when i am entering text in some particular text-field suppose 5th onwards. How can i do so.

Upvotes: 0

Views: 47

Answers (4)

Chirag Shah
Chirag Shah

Reputation: 3016

hi i have used this code from long time and it is very useful for scrollview and tableview

#pragma mark
#pragma mark - text field delegate method
-(void)textFieldDidBeginEditing:(UITextField *)textField
{
    [self showKeyBoard:YES];
    [self setTableOffsetForTextField:textField];
}
-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    [self.view endEditing:YES];
    [self showKeyBoard:NO];
    return YES;
}
#pragma mark - Show Hide Key Board
- (void)showKeyBoard:(BOOL)boolValue
{
    scrollView.contentInset = UIEdgeInsetsMake(0, 0, boolValue ? ([self kbHeight1]) : 0.0, 0.0);
}


- (CGFloat)kbHeight1
{
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

        UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

        if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown) {
            return 264.0;
        }
        else
        {
            return 352.0;
        }
    }
    else
    {
        return 216.0;
    }

}
- (void)setTableOffsetForTextField:(UIView *)textField
{

    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad && (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)){

        return;
    }


    CGPoint point = [textField convertPoint:textField.frame.origin toView:scrollView];
    CGFloat diff = [self difference];
    CGFloat pos = (point.y - diff);
    if (pos < 0 || pos > scrollView.contentSize.height - diff) {
        pos = 0;
    }
    [scrollView setContentOffset:CGPointMake(0, pos) animated:YES];
}


-(CGFloat)difference{
    CGSize screenSize = self.view.frame.size;

    CGFloat diff;
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {

        diff = (screenSize.height > 768) ? 264.0 : 250;

    }
    else
    {
        diff = (screenSize.height == 480) ? 120.0 : 70.0;        
    }
    return diff;
}

may this help you.

Upvotes: 1

Vidhyanand
Vidhyanand

Reputation: 5369

You can do it using tags.

Put tags to each text field as 1-8 for 8 textfields. Check the tag value for text field if it is equal or greater than 5 then only apply your scrollview else return;

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    if(textField.tag==5 || textField.tag>=5)
       {
       //Implement scrollview here
       }
}

Hope it helps you...!

Upvotes: 0

Varij Kapil
Varij Kapil

Reputation: 103

Use NSNotifications to know the height of the keyboard:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKeyboardEditProfile) name:UIKeyboardWillShowNotification object:nil];

and then implement this function to get the height of the keyboard:

-(void)showKeyBoard:(NSNotification *)notification
{

NSDictionary *info=[notification userInfo];
 keyboardSize=[[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;

}

This will give you the size of the keyboard.

Now use set the tags of the textfields in increasing order of their appearance, and set your view controller as their delegate.

Then use this delegate method to set the contentOffset of the scrollView:

- (void)textFieldDidBeginEditing:(UITextField *)textField { 
}

Upvotes: 1

sfirite
sfirite

Reputation: 161

implement method of UITextFieldDelegate:

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    [self.scroolView scrollRectToVisible:textfield.frame animated:YES]; 
}

You can implement more custom logic to calculate visibleFrame in this method.

Upvotes: 0

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