ios UICollectionView remove header programmatically
I want have a control of the header of a UICollectionView as I need to remove and add it based on user-generated events.
What I have tried so far:
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{
if(toRemoveHeader){
return CGSizeZero;
}else{
return CGSizeMake(320, 45);
}
}
And then call [self.collectionView reloadData] whenever the user-event is generated. I would prefer to make this without reloading the data. Any ideas?
ios uicollectionview uicollectionviewlayout
edited Jan 3 at 5:48
Cœur
19k9114155
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
add a comment |
I want have a control of the header of a UICollectionView as I need to remove and add it based on user-generated events.
What I have tried so far:
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{
if(toRemoveHeader){
return CGSizeZero;
}else{
return CGSizeMake(320, 45);
}
}
And then call [self.collectionView reloadData] whenever the user-event is generated. I would prefer to make this without reloading the data. Any ideas?
ios uicollectionview uicollectionviewlayout
edited Jan 3 at 5:48
Cœur
19k9114155
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
Hi! How you has solved this? =D
– Adriano Tadao
Oct 13 '14 at 17:29
I dont think i solved it...
– Petar
Oct 14 '14 at 7:08
add a comment |
I want have a control of the header of a UICollectionView as I need to remove and add it based on user-generated events.
What I have tried so far:
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{
if(toRemoveHeader){
return CGSizeZero;
}else{
return CGSizeMake(320, 45);
}
}
And then call [self.collectionView reloadData] whenever the user-event is generated. I would prefer to make this without reloading the data. Any ideas?
ios uicollectionview uicollectionviewlayout
edited Jan 3 at 5:48
Cœur
19k9114155
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
I want have a control of the header of a UICollectionView as I need to remove and add it based on user-generated events.
What I have tried so far:
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{
if(toRemoveHeader){
return CGSizeZero;
}else{
return CGSizeMake(320, 45);
}
}
And then call [self.collectionView reloadData] whenever the user-event is generated. I would prefer to make this without reloading the data. Any ideas?
ios uicollectionview uicollectionviewlayout
ios uicollectionview uicollectionviewlayout
edited Jan 3 at 5:48
Cœur
19k9114155
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
edited Jan 3 at 5:48
Cœur
19k9114155
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
edited Jan 3 at 5:48
Cœur
19k9114155
edited Jan 3 at 5:48
Cœur
19k9114155
edited Jan 3 at 5:48
Cœur
19k9114155
19k9114155
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
asked Mar 14 '14 at 9:29
PetarPetar
1,48011935
1,48011935
Hi! How you has solved this? =D
– Adriano Tadao
Oct 13 '14 at 17:29
I dont think i solved it...
– Petar
Oct 14 '14 at 7:08
add a comment |
Hi! How you has solved this? =D
– Adriano Tadao
Oct 13 '14 at 17:29
I dont think i solved it...
– Petar
Oct 14 '14 at 7:08
Hi! How you has solved this? =D
– Adriano Tadao
Oct 13 '14 at 17:29
Hi! How you has solved this? =D
– Adriano Tadao
Oct 13 '14 at 17:29
I dont think i solved it...
– Petar
Oct 14 '14 at 7:08
I dont think i solved it...
– Petar
Oct 14 '14 at 7:08
add a comment |
2 Answers
2
active
oldest
votes
Your implementation is fully functional, the problem might be that you don't assign the object implementing that function to the delegate property of your collectionView.
The function collectionView:layout:referenceSizeForHeaderInSection: is implemented by a class confirming to the UICollectionViewDelegateFlowLayout protocol, and the collectionView expects its delegate to implement this method, and not its dataSource.
In one of my implementations I show a footer only if there are no cells in that section, and as long as the delegate property is set correctly it works perfectly.
#pragma mark - UICollectionViewDelegateFlowLayout
- (CGSize) collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
referenceSizeForFooterInSection:(NSInteger)section
{
NSUInteger count = [self collectionView: collectionView
numberOfItemsInSection: section];
CGFloat footerHeight = (count == 0) ? 60.f : 0.f;
CGFloat footerWidth = collectionView.frame.size.width;
return CGSizeMake(footerWidth, footerHeight);
}
answered Sep 9 '16 at 15:47
AerowsAerows
538418
add a comment |
If you are using Swift you can do it this way in your UICollectionViewController subclass:
var hideHeader: Bool = true //or false to not hide the header
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
if hideHeader {
return CGSizeZero //supplementary view will not be displayed if height/width are 0
} else {
return CGSizeMake(30,80) //size of your UICollectionReusableView
}
}
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
or if you want to get the existing size of the header view as specified in the storyboard, replace the CGSizeMake(30,80) line with this:let headerView = self.view.subviews[0].subviews[0] as! UICollectionReusableView let existingSize = headerView.frame.size return existingSize
– gammachill
Feb 25 '16 at 15:59
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your implementation is fully functional, the problem might be that you don't assign the object implementing that function to the delegate property of your collectionView.
The function collectionView:layout:referenceSizeForHeaderInSection: is implemented by a class confirming to the UICollectionViewDelegateFlowLayout protocol, and the collectionView expects its delegate to implement this method, and not its dataSource.
In one of my implementations I show a footer only if there are no cells in that section, and as long as the delegate property is set correctly it works perfectly.
#pragma mark - UICollectionViewDelegateFlowLayout
- (CGSize) collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
referenceSizeForFooterInSection:(NSInteger)section
{
NSUInteger count = [self collectionView: collectionView
numberOfItemsInSection: section];
CGFloat footerHeight = (count == 0) ? 60.f : 0.f;
CGFloat footerWidth = collectionView.frame.size.width;
return CGSizeMake(footerWidth, footerHeight);
}
answered Sep 9 '16 at 15:47
AerowsAerows
538418
add a comment |
Your implementation is fully functional, the problem might be that you don't assign the object implementing that function to the delegate property of your collectionView.
The function collectionView:layout:referenceSizeForHeaderInSection: is implemented by a class confirming to the UICollectionViewDelegateFlowLayout protocol, and the collectionView expects its delegate to implement this method, and not its dataSource.
In one of my implementations I show a footer only if there are no cells in that section, and as long as the delegate property is set correctly it works perfectly.
#pragma mark - UICollectionViewDelegateFlowLayout
- (CGSize) collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
referenceSizeForFooterInSection:(NSInteger)section
{
NSUInteger count = [self collectionView: collectionView
numberOfItemsInSection: section];
CGFloat footerHeight = (count == 0) ? 60.f : 0.f;
CGFloat footerWidth = collectionView.frame.size.width;
return CGSizeMake(footerWidth, footerHeight);
}
answered Sep 9 '16 at 15:47
AerowsAerows
538418
add a comment |
Your implementation is fully functional, the problem might be that you don't assign the object implementing that function to the delegate property of your collectionView.
The function collectionView:layout:referenceSizeForHeaderInSection: is implemented by a class confirming to the UICollectionViewDelegateFlowLayout protocol, and the collectionView expects its delegate to implement this method, and not its dataSource.
In one of my implementations I show a footer only if there are no cells in that section, and as long as the delegate property is set correctly it works perfectly.
#pragma mark - UICollectionViewDelegateFlowLayout
- (CGSize) collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
referenceSizeForFooterInSection:(NSInteger)section
{
NSUInteger count = [self collectionView: collectionView
numberOfItemsInSection: section];
CGFloat footerHeight = (count == 0) ? 60.f : 0.f;
CGFloat footerWidth = collectionView.frame.size.width;
return CGSizeMake(footerWidth, footerHeight);
}
answered Sep 9 '16 at 15:47
AerowsAerows
538418
Your implementation is fully functional, the problem might be that you don't assign the object implementing that function to the delegate property of your collectionView.
The function collectionView:layout:referenceSizeForHeaderInSection: is implemented by a class confirming to the UICollectionViewDelegateFlowLayout protocol, and the collectionView expects its delegate to implement this method, and not its dataSource.
In one of my implementations I show a footer only if there are no cells in that section, and as long as the delegate property is set correctly it works perfectly.
#pragma mark - UICollectionViewDelegateFlowLayout
- (CGSize) collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
referenceSizeForFooterInSection:(NSInteger)section
{
NSUInteger count = [self collectionView: collectionView
numberOfItemsInSection: section];
CGFloat footerHeight = (count == 0) ? 60.f : 0.f;
CGFloat footerWidth = collectionView.frame.size.width;
return CGSizeMake(footerWidth, footerHeight);
}
answered Sep 9 '16 at 15:47
AerowsAerows
538418
answered Sep 9 '16 at 15:47
AerowsAerows
538418
answered Sep 9 '16 at 15:47
AerowsAerows
538418
answered Sep 9 '16 at 15:47
AerowsAerows
538418
538418
add a comment |
add a comment |
If you are using Swift you can do it this way in your UICollectionViewController subclass:
var hideHeader: Bool = true //or false to not hide the header
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
if hideHeader {
return CGSizeZero //supplementary view will not be displayed if height/width are 0
} else {
return CGSizeMake(30,80) //size of your UICollectionReusableView
}
}
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
or if you want to get the existing size of the header view as specified in the storyboard, replace the CGSizeMake(30,80) line with this:let headerView = self.view.subviews[0].subviews[0] as! UICollectionReusableView let existingSize = headerView.frame.size return existingSize
– gammachill
Feb 25 '16 at 15:59
add a comment |
If you are using Swift you can do it this way in your UICollectionViewController subclass:
var hideHeader: Bool = true //or false to not hide the header
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
if hideHeader {
return CGSizeZero //supplementary view will not be displayed if height/width are 0
} else {
return CGSizeMake(30,80) //size of your UICollectionReusableView
}
}
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
or if you want to get the existing size of the header view as specified in the storyboard, replace the CGSizeMake(30,80) line with this:let headerView = self.view.subviews[0].subviews[0] as! UICollectionReusableView let existingSize = headerView.frame.size return existingSize
– gammachill
Feb 25 '16 at 15:59
add a comment |
If you are using Swift you can do it this way in your UICollectionViewController subclass:
var hideHeader: Bool = true //or false to not hide the header
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
if hideHeader {
return CGSizeZero //supplementary view will not be displayed if height/width are 0
} else {
return CGSizeMake(30,80) //size of your UICollectionReusableView
}
}
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
If you are using Swift you can do it this way in your UICollectionViewController subclass:
var hideHeader: Bool = true //or false to not hide the header
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
if hideHeader {
return CGSizeZero //supplementary view will not be displayed if height/width are 0
} else {
return CGSizeMake(30,80) //size of your UICollectionReusableView
}
}
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
edited Nov 1 '16 at 9:26
Natan R.
4,42312545
4,42312545
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
answered Feb 25 '16 at 15:58
gammachillgammachill
878813
878813
or if you want to get the existing size of the header view as specified in the storyboard, replace the CGSizeMake(30,80) line with this:let headerView = self.view.subviews[0].subviews[0] as! UICollectionReusableView let existingSize = headerView.frame.size return existingSize
– gammachill
Feb 25 '16 at 15:59
add a comment |
or if you want to get the existing size of the header view as specified in the storyboard, replace the CGSizeMake(30,80) line with this:let headerView = self.view.subviews[0].subviews[0] as! UICollectionReusableView let existingSize = headerView.frame.size return existingSize
– gammachill
Feb 25 '16 at 15:59
or if you want to get the existing size of the header view as specified in the storyboard, replace the CGSizeMake(30,80) line with this:
let headerView = self.view.subviews[0].subviews[0] as! UICollectionReusableView let existingSize = headerView.frame.size return existingSize– gammachill
Feb 25 '16 at 15:59
or if you want to get the existing size of the header view as specified in the storyboard, replace the CGSizeMake(30,80) line with this:
let headerView = self.view.subviews[0].subviews[0] as! UICollectionReusableView let existingSize = headerView.frame.size return existingSize– gammachill
Feb 25 '16 at 15:59
add a comment |
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Hi! How you has solved this? =D
– Adriano Tadao
Oct 13 '14 at 17:29
I dont think i solved it...
– Petar
Oct 14 '14 at 7:08