当有空格时,防止uicollectionview单元格窗体向右移动--SWIFT
我的问题是,当下一个单元格跳到第二行时,uicollectionview单元格正在向左移动,而第一行中有空间(不适合容纳下一个单元格的空间),我如何防止单元格向右移动,即使还有空间,我也需要设置单元格之间的最大空间之类的东西(哪些不存在) 这是我的密码:当有空格时,防止uicollectionview单元格窗体向右移动--SWIFT,swift,uicollectionview,uicollectionviewcell,uicollectionviewlayout,Swift,Uicollectionview,Uicollectionviewcell,Uicollectionviewlayout,我的问题是,当下一个单元格跳到第二行时,uicollectionview单元格正在向左移动,而第一行中有空间(不适合容纳下一个单元格的空间),我如何防止单元格向右移动,即使还有空间,我也需要设置单元格之间的最大空间之类的东西(哪些不存在) 这是我的密码: func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionVi
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = mycollectionView.dequeueReusableCellWithReuseIdentifier("CharakterCell", forIndexPath: indexPath) as CharakterCollectionViewCell
for (var i=0 ; i<4 ; i++)
{
if (collectionCellIndex[i] == nil)
{
collectionCellIndex[i] = indexPath
println("\(collectionCellIndex[i])")
println(i)
break
}
}
return cell
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout:UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
var size = CGSize(width: 0, height: 0)
var label = UILabel()
if (selectedCharInCollectionNames[indexPath.row] == "")
{
size = CGSize(width: 40, height: 30)
}
else
{
label.text = selectedCharInCollectionNames[indexPath.row]
label.sizeToFit()
var width = label.frame.width
size = CGSize(width: (width+25), height: 30)
}
label.sizeToFit()
return size
}
private let sectionInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
func collectionView(collectionView: UICollectionView!,
layout collectionViewLayout: UICollectionViewLayout!,
insetForSectionAtIndex section: Int) -> UIEdgeInsets {
return sectionInsets
}
func collectionView(collectionView:UICollectionView,cellForItemAtIndexPath indepath:nsindepath)->UICollectionViewCell{
让cell=mycollectionView.dequeueReusableCellWithReuseIdentifier(“CharakterCell”,forIndexPath:indexPath)作为CharakterCollectionViewCell
对于(var i=0;i CGSize){
变量大小=CGSize(宽度:0,高度:0)
var label=UILabel()
如果(selectedCharInCollectionNames[indexPath.row]=“”)
{
尺寸=CGSize(宽:40,高:30)
}
其他的
{
label.text=selectedCharInCollectionNames[indexPath.row]
label.sizeToFit()
变量宽度=label.frame.width
尺寸=CGSize(宽度:(宽度+25),高度:30)
}
label.sizeToFit()
返回大小
}
私有let sectionInsets=UIEdgeInsets(顶部:10,左侧:10,底部:10,右侧:10)
func collectionView(collectionView:UICollectionView!,
布局集合视图布局:UICollectionViewLayout!,
insetForSectionAtIndex节:Int)->UIEdgeInsets{
返回部分插图
}
@Kevin R答案!解决了我的问题
class AlignLeftFlowLayout: UICollectionViewFlowLayout {
var maximumCellSpacing = CGFloat(9.0)
override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? {
let attributesToReturn = super.layoutAttributesForElementsInRect(rect) as? [UICollectionViewLayoutAttributes]
for attributes in attributesToReturn ?? [] {
if attributes.representedElementKind == nil {
attributes.frame = self.layoutAttributesForItemAtIndexPath(attributes.indexPath).frame
}
}
return attributesToReturn
}
override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes! {
let curAttributes = super.layoutAttributesForItemAtIndexPath(indexPath)
let sectionInset = (self.collectionView?.collectionViewLayout as UICollectionViewFlowLayout).sectionInset
if indexPath.item == 0 {
let f = curAttributes.frame
curAttributes.frame = CGRectMake(sectionInset.left, f.origin.y, f.size.width, f.size.height)
return curAttributes
}
let prevIndexPath = NSIndexPath(forItem: indexPath.item-1, inSection: indexPath.section)
let prevFrame = self.layoutAttributesForItemAtIndexPath(prevIndexPath).frame
let prevFrameRightPoint = prevFrame.origin.x + prevFrame.size.width + maximumCellSpacing
let curFrame = curAttributes.frame
let stretchedCurFrame = CGRectMake(0, curFrame.origin.y, self.collectionView!.frame.size.width, curFrame.size.height)
if CGRectIntersectsRect(prevFrame, stretchedCurFrame) {
curAttributes.frame = CGRectMake(prevFrameRightPoint, curFrame.origin.y, curFrame.size.width, curFrame.size.height)
} else {
curAttributes.frame = CGRectMake(sectionInset.left, curFrame.origin.y, curFrame.size.width, curFrame.size.height)
}
return curAttributes
}
}