iOS UICollectionView推送刷新时出现意外行为

Question

I'm try to implement push to refresh on my collectionView, the code is it.

private lazy var refreshControl : UIRefreshControl = {
    let frame = CGRect(x: 0, y: 0, width: 30, height: 30)
    let control = UIRefreshControl(frame: frame)
    control.addTarget(self, action: #selector(getAllJobs), for: .valueChanged)
    return control
}()

collectionView.refreshControl = refreshControl

Answer 1

There is no need to set frame for UIRefreshControl

I usually implement it using the following steps:

In class properties block:

let refreshControl: UIRefreshControl = UIRefreshControl()

In viewDidLoad :

collectionView.alwaysBounceVertical = true
collectionView.refreshControl = refreshControl
refreshControl.addTarget(self, action: #selector(loadData), for: .valueChanged)

Somewhere in class body:

// Refresh handler
@objc func loadData() {
        // Your refresh-code here
}

Hope it helps.

PS Sometimes there is refresh control flicker bug (somehow similar to yours). It can be solved by adding: extendedLayoutIncludesOpaqueBars = true to your viewDidLoad() method.