UICollectionView 水平滚动照片库 swift
UICollectionView horizantal scrolling Photo Gallery with swift
我正在尝试使用 UICollectionView
和 Swift 制作照片库。我想全屏显示照片并向右滑动以获取下一张图片。我有一个肖像框的工作代码,但是一旦我转到风景,我的单元格似乎没有重新调整到正确的位置和大小。
意味着它始终保持相同的width
、height
、x position
和y position
。我在纵向和横向框架上也出现此错误:
->未定义 UICollectionViewFlowLayout 的行为,因为:
->项目高度必须小于 UICollectionView 的高度减去部分插入顶部和底部值。
我在网上寻找答案并尝试了所有可能的解决方案,但它似乎对我不起作用。让我知道是否有人可以帮助解决这个问题。非常感谢。
这是我的代码:
import UIKit
class ImageDetailViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout,UINavigationControllerDelegate {
@IBOutlet weak var imgDetailCollectionView: UICollectionView!
var index: Int!
var imageItems: Array<Items> = []
var currentIndex: CGFloat!
var size = UIScreen.mainScreen().bounds.size
init(index: Int , imageItems: Array<Items>) {
self.index = index
self.imageItems = imageItems
super.init(nibName: "ImageDetailViewController", bundle: NSBundle.mainBundle())
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
imgDetailCollectionView.registerNib(UINib(nibName: "ImageDetailCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "ImageDetailCollectionViewCell")
//self.automaticallyAdjustsScrollViewInsets = false
imgDetailCollectionView.setZoomScale(0.5, animated: true)
}
override func viewDidLayoutSubviews() {
imgDetailCollectionView.scrollRectToVisible(CGRectMake(320 * CGFloat(index), 0, 320 , 240), animated: false)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
return self.imageItems.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell{
var cell = imgDetailCollectionView.dequeueReusableCellWithReuseIdentifier("ImageDetailCollectionViewCell", forIndexPath: indexPath) as ImageDetailCollectionViewCell
cell.setup(imageItems[indexPath.row].url!)
if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation)){
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
var frame = cell.frame
frame.size = CGSizeMake(size.width, size.height)
cell.frame = frame
}else{
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
var frame = cell.frame
frame.size = CGSizeMake(size.height, size.width)
cell.frame = frame
}
return cell
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
var size = UIScreen.mainScreen().bounds.size
if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation)){
return CGSizeMake(size.width, size.height)
}else{
return CGSizeMake(size.height, size.width)
}
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
return 0
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
return 0
}
override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
var currentOffset = self.imgDetailCollectionView.contentOffset
self.currentIndex = currentOffset.x / imgDetailCollectionView.frame.size.width
}
override func didRotateFromInterfaceOrientation(fromInterfaceOrientation: UIInterfaceOrientation) {
var currentSize = imgDetailCollectionView.bounds.size
var offset = self.currentIndex * currentSize.width
imgDetailCollectionView.setContentOffset(CGPointMake(offset, 0), animated: false)
imgDetailCollectionView.reloadData()
}
override func willAnimateRotationToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
}
}
您的问题是您在横向模式下检查方向并使用高度作为宽度。这是不正确的。当设备旋转时,宽度 属性 将 return 设备纵向时的实际高度。
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
var cell = imgDetailCollectionView.dequeueReusableCellWithReuseIdentifier("ImageDetailCollectionViewCell", forIndexPath: indexPath) as ImageDetailCollectionViewCell
cell.setup(imageItems[indexPath.row].url!)
cell.frame.size = view.frame.size
return cell
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
return CGSizeMake(view.frame.width, view.frame.height)
}
另外注意,apple建议大家使用viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator)
方式,因为这是较新的API方式。此外,在 iOS9 中,如果您改用此方法,您将通过使用此方法启用多任务处理功能。
由于下一行,可能会打印此错误:
var size = UIScreen.mainScreen().bounds.size
为了快速检查,您可以输入例如:
var 大小 = UIScreen.mainScreen().bounds.size * 0.25
如果错误消息消失,您应该按照消息中的说明从可用高度中减去 collectionView 的 contentInsets 和 sectionInsets (collectionView.bounds.height)。
这样做,您将避免出现单元格高度试图比 collectionView 'higher' 高的情况。
我正在尝试使用 UICollectionView
和 Swift 制作照片库。我想全屏显示照片并向右滑动以获取下一张图片。我有一个肖像框的工作代码,但是一旦我转到风景,我的单元格似乎没有重新调整到正确的位置和大小。
意味着它始终保持相同的width
、height
、x position
和y position
。我在纵向和横向框架上也出现此错误:
->未定义 UICollectionViewFlowLayout 的行为,因为:
->项目高度必须小于 UICollectionView 的高度减去部分插入顶部和底部值。
我在网上寻找答案并尝试了所有可能的解决方案,但它似乎对我不起作用。让我知道是否有人可以帮助解决这个问题。非常感谢。
这是我的代码:
import UIKit
class ImageDetailViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout,UINavigationControllerDelegate {
@IBOutlet weak var imgDetailCollectionView: UICollectionView!
var index: Int!
var imageItems: Array<Items> = []
var currentIndex: CGFloat!
var size = UIScreen.mainScreen().bounds.size
init(index: Int , imageItems: Array<Items>) {
self.index = index
self.imageItems = imageItems
super.init(nibName: "ImageDetailViewController", bundle: NSBundle.mainBundle())
}
required init(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func viewDidLoad() {
super.viewDidLoad()
imgDetailCollectionView.registerNib(UINib(nibName: "ImageDetailCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "ImageDetailCollectionViewCell")
//self.automaticallyAdjustsScrollViewInsets = false
imgDetailCollectionView.setZoomScale(0.5, animated: true)
}
override func viewDidLayoutSubviews() {
imgDetailCollectionView.scrollRectToVisible(CGRectMake(320 * CGFloat(index), 0, 320 , 240), animated: false)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
return self.imageItems.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell{
var cell = imgDetailCollectionView.dequeueReusableCellWithReuseIdentifier("ImageDetailCollectionViewCell", forIndexPath: indexPath) as ImageDetailCollectionViewCell
cell.setup(imageItems[indexPath.row].url!)
if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation)){
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
var frame = cell.frame
frame.size = CGSizeMake(size.width, size.height)
cell.frame = frame
}else{
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
var frame = cell.frame
frame.size = CGSizeMake(size.height, size.width)
cell.frame = frame
}
return cell
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
var size = UIScreen.mainScreen().bounds.size
if(UIDeviceOrientationIsPortrait(UIDevice.currentDevice().orientation)){
return CGSizeMake(size.width, size.height)
}else{
return CGSizeMake(size.height, size.width)
}
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
return 0
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
return 0
}
override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
var currentOffset = self.imgDetailCollectionView.contentOffset
self.currentIndex = currentOffset.x / imgDetailCollectionView.frame.size.width
}
override func didRotateFromInterfaceOrientation(fromInterfaceOrientation: UIInterfaceOrientation) {
var currentSize = imgDetailCollectionView.bounds.size
var offset = self.currentIndex * currentSize.width
imgDetailCollectionView.setContentOffset(CGPointMake(offset, 0), animated: false)
imgDetailCollectionView.reloadData()
}
override func willAnimateRotationToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {
self.imgDetailCollectionView.collectionViewLayout.invalidateLayout()
}
}
您的问题是您在横向模式下检查方向并使用高度作为宽度。这是不正确的。当设备旋转时,宽度 属性 将 return 设备纵向时的实际高度。
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
var cell = imgDetailCollectionView.dequeueReusableCellWithReuseIdentifier("ImageDetailCollectionViewCell", forIndexPath: indexPath) as ImageDetailCollectionViewCell
cell.setup(imageItems[indexPath.row].url!)
cell.frame.size = view.frame.size
return cell
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
return CGSizeMake(view.frame.width, view.frame.height)
}
另外注意,apple建议大家使用viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator)
方式,因为这是较新的API方式。此外,在 iOS9 中,如果您改用此方法,您将通过使用此方法启用多任务处理功能。
由于下一行,可能会打印此错误:
var size = UIScreen.mainScreen().bounds.size
为了快速检查,您可以输入例如:
var 大小 = UIScreen.mainScreen().bounds.size * 0.25
如果错误消息消失,您应该按照消息中的说明从可用高度中减去 collectionView 的 contentInsets 和 sectionInsets (collectionView.bounds.height)。
这样做,您将避免出现单元格高度试图比 collectionView 'higher' 高的情况。