ios - 必须调用父类(super class) 'UICollectionView' 的指定初始化程序

Question

尝试初始化 Collection View 类并出现以下错误:

Must call a designated initializer of the superclass 'UICollectionView'

数据正在从另一个 ViewController 传递，我希望在用户搜索时从 ViewController 中绘制框架。

class searchLocationsCollectionViewManager: UICollectionView, UICollectionViewDataSource, UICollectionViewDelegate {

weak var collectionView: UICollectionView! {
    didSet {
        collectionView.dataSource = self
        collectionView.delegate = self
    }
}

// Data handler
var data: [[String:Any]]? {
    didSet {
        print(data!)
        //collectionView.reloadData()
    }
}

init(collectionView: UICollectionView, frame: CGRect) {
    self.collectionView = collectionView
    super.init()
}

required init(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)!
}



func numberOfSections(in collectionView: UICollectionView) -> Int {
    return 1
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 3
}

// This is the current method for returning the cell.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {




    return UICollectionViewCell()

}

关于为什么会发生上述情况有什么想法吗？

Answer 1

你需要调用指定的初始化器init(frame:collectionViewLayout:)的 UICollectionView。

init(collectionView: UICollectionView, frame: CGRect) {        
    self.collectionView = collectionView
    //Setup collectionView layout here and pass with init 
    let layout = UICollectionViewLayout()
    super.init(frame: frame, collectionViewLayout: layout)
}