滚动我的一个collectionView时,我遇到了一个奇怪的问题。当我正在打印时indexPath.row
从0..6开始正常,但最后indexPath.row
为3,然后如果我向后滚动它或者用excbadadress崩溃或以随机顺序打印1,2,4 。我假设我的代码中有错误但实际上不明白它在哪里。
这是我的代码:
VC:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath) -> CGSize {
if collectionView == mainEventsCollectionView {
return CGSize(width: UIScreen.main.bounds.width - 40, height: 180)
} else {
return CGSize(width: 150, height: 200)
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == mainEventsCollectionView {
return 3
} else {
return 7
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == mainEventsCollectionView {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "mainEventsCell", for: indexPath) as! MainEventCollectionViewCell
cell.eventTitle.text = "Hello world".uppercased()
cell.setupCell()
return cell
} else {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "importantEventsCell", for: indexPath) as! ImportantEventsCollectionViewCell
print(indexPath.row)
cell.setupCell()
return cell
}
}
细胞:
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
self.roundCorners(.allCorners, radius: 6, borderColor: .clear, borderWidth: 0)
}
func setupCell() {
self.content.backgroundColor = colorWithAlpha(.black, alpha: 0.7)
self.eventDate.textColor = .white
self.eventTime.textColor = .white
self.eventName.textColor = .white
if self.content.layer.sublayers!.count > 3 {
self.content.layer.sublayers!.removeLast()
}
if self.eventDate.text == "Today" {
self.content.backgroundColor = .clear
DispatchQueue.main.async(execute: {
self.content.drawGradient(colors: [UIColor(red: 250/255, green: 217/255, blue: 97/255, alpha: 0.7).cgColor, UIColor(red: 255/255, green: 135/255, blue: 67/255, alpha: 0.7).cgColor], locations: [0, 1])
})
self.eventDate.textColor = .black
self.eventTime.textColor = .black
self.eventName.textColor = .black
}
}
答案 0 :(得分:0)
好的,问题是我尝试将渐变应用于UIView
,其中包含元素(UILables
)。我要做的是向UIView
添加一个子视图并对其应用渐变。