UICollectionView with exact number of items in a row - rounding value
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I am calculating UICollectionView
Cell itemSize, such that if the count is passed it calculates the size accordingly.
I have considered the sectionInset.left
and sectionInset.right
as well as the minimumInteritemSpacing
When testing in iPhone XR, I get the finalW
as 124.66666666666667. This is when numberOfItems
is passed as 3, left and right insets are 10 each and minimuminteritemSpacing is 10.
The problem here is it shows 2 items instead of 3.
Debugging it further if I have CGSize Object (124.666,124.66) it shows 3 items
But If I leave it as it is without rounding it shows only 2 items. i.e (124.66666666666667,124.66666666666667)
Not sure if the calculation is wrong or what am I doing wrong.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return calculateItemSize(numberofItems: 3)
}
func calculateItemSize(numberofItems:Int) -> CGSize{
//Max Width
let maxW = self.collectionList.frame.width
let flowLayoutObject = self.collectionList.collectionViewLayout as! UICollectionViewFlowLayout
//Left and right inset
let leftInset = flowLayoutObject.sectionInset.left
let rightInset = flowLayoutObject.sectionInset.right
//UsableW
let usableW = maxW - leftInset - rightInset
let usableWWithSpacing = usableW - CGFloat(numberofItems-1)*flowLayoutObject.minimumInteritemSpacing
let finalW = (usableWWithSpacing) / CGFloat(numberofItems)
return CGSize(width: finalW, height: finalW)
}
ios uicollectionview uicollectionviewlayout cgsize
add a comment |
I am calculating UICollectionView
Cell itemSize, such that if the count is passed it calculates the size accordingly.
I have considered the sectionInset.left
and sectionInset.right
as well as the minimumInteritemSpacing
When testing in iPhone XR, I get the finalW
as 124.66666666666667. This is when numberOfItems
is passed as 3, left and right insets are 10 each and minimuminteritemSpacing is 10.
The problem here is it shows 2 items instead of 3.
Debugging it further if I have CGSize Object (124.666,124.66) it shows 3 items
But If I leave it as it is without rounding it shows only 2 items. i.e (124.66666666666667,124.66666666666667)
Not sure if the calculation is wrong or what am I doing wrong.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return calculateItemSize(numberofItems: 3)
}
func calculateItemSize(numberofItems:Int) -> CGSize{
//Max Width
let maxW = self.collectionList.frame.width
let flowLayoutObject = self.collectionList.collectionViewLayout as! UICollectionViewFlowLayout
//Left and right inset
let leftInset = flowLayoutObject.sectionInset.left
let rightInset = flowLayoutObject.sectionInset.right
//UsableW
let usableW = maxW - leftInset - rightInset
let usableWWithSpacing = usableW - CGFloat(numberofItems-1)*flowLayoutObject.minimumInteritemSpacing
let finalW = (usableWWithSpacing) / CGFloat(numberofItems)
return CGSize(width: finalW, height: finalW)
}
ios uicollectionview uicollectionviewlayout cgsize
add a comment |
I am calculating UICollectionView
Cell itemSize, such that if the count is passed it calculates the size accordingly.
I have considered the sectionInset.left
and sectionInset.right
as well as the minimumInteritemSpacing
When testing in iPhone XR, I get the finalW
as 124.66666666666667. This is when numberOfItems
is passed as 3, left and right insets are 10 each and minimuminteritemSpacing is 10.
The problem here is it shows 2 items instead of 3.
Debugging it further if I have CGSize Object (124.666,124.66) it shows 3 items
But If I leave it as it is without rounding it shows only 2 items. i.e (124.66666666666667,124.66666666666667)
Not sure if the calculation is wrong or what am I doing wrong.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return calculateItemSize(numberofItems: 3)
}
func calculateItemSize(numberofItems:Int) -> CGSize{
//Max Width
let maxW = self.collectionList.frame.width
let flowLayoutObject = self.collectionList.collectionViewLayout as! UICollectionViewFlowLayout
//Left and right inset
let leftInset = flowLayoutObject.sectionInset.left
let rightInset = flowLayoutObject.sectionInset.right
//UsableW
let usableW = maxW - leftInset - rightInset
let usableWWithSpacing = usableW - CGFloat(numberofItems-1)*flowLayoutObject.minimumInteritemSpacing
let finalW = (usableWWithSpacing) / CGFloat(numberofItems)
return CGSize(width: finalW, height: finalW)
}
ios uicollectionview uicollectionviewlayout cgsize
I am calculating UICollectionView
Cell itemSize, such that if the count is passed it calculates the size accordingly.
I have considered the sectionInset.left
and sectionInset.right
as well as the minimumInteritemSpacing
When testing in iPhone XR, I get the finalW
as 124.66666666666667. This is when numberOfItems
is passed as 3, left and right insets are 10 each and minimuminteritemSpacing is 10.
The problem here is it shows 2 items instead of 3.
Debugging it further if I have CGSize Object (124.666,124.66) it shows 3 items
But If I leave it as it is without rounding it shows only 2 items. i.e (124.66666666666667,124.66666666666667)
Not sure if the calculation is wrong or what am I doing wrong.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return calculateItemSize(numberofItems: 3)
}
func calculateItemSize(numberofItems:Int) -> CGSize{
//Max Width
let maxW = self.collectionList.frame.width
let flowLayoutObject = self.collectionList.collectionViewLayout as! UICollectionViewFlowLayout
//Left and right inset
let leftInset = flowLayoutObject.sectionInset.left
let rightInset = flowLayoutObject.sectionInset.right
//UsableW
let usableW = maxW - leftInset - rightInset
let usableWWithSpacing = usableW - CGFloat(numberofItems-1)*flowLayoutObject.minimumInteritemSpacing
let finalW = (usableWWithSpacing) / CGFloat(numberofItems)
return CGSize(width: finalW, height: finalW)
}
ios uicollectionview uicollectionviewlayout cgsize
ios uicollectionview uicollectionviewlayout cgsize
edited Jan 1 at 17:06
andyPaul
asked Jan 1 at 4:36
andyPaulandyPaul
1,66553166
1,66553166
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