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Add ‘scrollOffset’ property

This commit is contained in:
WenchaoD 2017-02-21 22:33:16 +08:00
parent f72e492bab
commit 00474bf3bb
1 changed files with 6 additions and 1 deletions
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7
FSPagerView/FSPagerView.swift
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@ -153,6 +153,11 @@ open class FSPagerView: UIView,UICollectionViewDataSource,UICollectionViewDelega
return self.collectionView.isTracking
}
open var scrollOffset: CGFloat {
let scrollOffset = Double(self.collectionView.contentOffset.x.divided(by: self.collectionViewLayout.itemSpan))
return fmod(CGFloat(scrollOffset), CGFloat(Double(self.numberOfItems)))
}
// MARK: - Public readonly-properties
open fileprivate(set) dynamic var currentIndex: Int = 0
@ -312,7 +317,7 @@ open class FSPagerView: UIView,UICollectionViewDataSource,UICollectionViewDelega
public func scrollViewDidScroll(_ scrollView: UIScrollView) {
if self.numberOfItems > 0 {
// In case someone is using KVO
let currentIndex = lround(Double(scrollView.contentOffset.x.divided(by: self.collectionViewLayout.itemSpan))) % self.numberOfItems
let currentIndex = lround(Double(self.scrollOffset))
if (currentIndex != self.currentIndex) {
self.currentIndex = currentIndex
}