最佳答案
Swift: 如何在设备旋转后刷新 UICollectionView 布局
我使用 UICollectionView (流布局)来构建一个简单的布局。
使用 self.view.frame.width将每个单元格的宽度设置为屏幕的宽度
但是当我旋转设备的时候，细胞就不会更新了。
我发现了一个函数，需要改变方向:
override func willRotateToInterfaceOrientation(toInterfaceOrientation:
UIInterfaceOrientation, duration: NSTimeInterval) {
//code
}
但是我找不到更新 UICollectionView 布局的方法
主代码在这里:
class ViewController: UIViewController , UICollectionViewDelegate , UICollectionViewDataSource , UICollectionViewDelegateFlowLayout{
@IBOutlet weak var myCollection: UICollectionView!
var numOfItemsInSecOne: Int!
override func viewDidLoad() {
super.viewDidLoad()
numOfItemsInSecOne = 8
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {
//print("orientation Changed")
}
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return numOfItemsInSecOne
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cellO", forIndexPath: indexPath)
return cell
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize{
let itemSize = CGSize(width: self.view.frame.width, height: 100)
return itemSize
}}
