[英]Can you make a custom view for a UIRefreshControl in Swift?
I want to put a custom Activity Indicator inside a view and place that inside the pull to refresh view. 我想在视图中放置自定义活动指示器,然后将其放置在下拉菜单中以刷新视图。 This pull to refresh is specifically for a table view. 此刷新刷新专门用于表视图。 What I tried.... 我试过了...
var headerView = UIView(frame: self.refreshControl.bounds)
headerView.addSubview(activityIndicator)
headerView.backgroundColor = UIColor.clear
headerView.frame = refreshControl.bounds
headerView.contentMode = .scaleAspectFit
headerView.translatesAutoresizingMaskIntoConstraints = false
refreshControl.tintColor = .clear
refreshControl.addSubview(headerView)
Yes, you can add your custom view to refresh control by calling addSubview
method. 是的,您可以通过调用addSubview
方法来添加自定义视图以刷新控件。
// Outlet of table view
@IBOutlet weak var tbl : UITableView!
// Create global variable of NVActivityIndicatorView
var nvActivityIndicator : NVActivityIndicatorView?
override func viewDidLoad() {
super.viewDidLoad()
// Create refresh control and add as subview in your table view.
let refreshControl = UIRefreshControl()
refreshControl.backgroundColor = .red
refreshControl.addTarget(self, action: #selector(pullToRefresh), for: .valueChanged)
tbl.addSubview(refreshControl)
// Create NVActivityIndicator view and add as subview inside refresh control
nvActivityIndicator = NVActivityIndicatorView(frame: refreshControl.bounds, type: NVActivityIndicatorType.ballRotate, color: .blue, padding: 0)
nvActivityIndicator?.backgroundColor = refreshControl.backgroundColor
nvActivityIndicator?.translatesAutoresizingMaskIntoConstraints = false
refreshControl.addSubview(nvActivityIndicator!)
// Add constraint to auto resize nvActivityIndicator as per refresh control view.
let nvActivityIndicator_top = NSLayoutConstraint(item: nvActivityIndicator!, attribute: .top, relatedBy: .equal, toItem: refreshControl, attribute: .top, multiplier: 1, constant: 0)
let nvActivityIndicator_bottom = NSLayoutConstraint(item: nvActivityIndicator!, attribute: .bottom, relatedBy: .equal, toItem: refreshControl, attribute: .bottom, multiplier: 1, constant: 0)
let nvActivityIndicator_leading = NSLayoutConstraint(item: nvActivityIndicator!, attribute: .leading, relatedBy: .equal, toItem: refreshControl, attribute: .leading, multiplier: 1, constant: 0)
let nvActivityIndicator_trailing = NSLayoutConstraint(item: nvActivityIndicator!, attribute: .trailing, relatedBy: .equal, toItem: refreshControl, attribute: .trailing, multiplier: 1, constant: 0)
// Add constrains
refreshControl.addConstraint(nvActivityIndicator_top)
refreshControl.addConstraint(nvActivityIndicator_bottom)
refreshControl.addConstraint(nvActivityIndicator_leading)
refreshControl.addConstraint(nvActivityIndicator_trailing)
// Set custom view background colour as per refreshControl background colour
refreshControl.tintColor = refreshControl.backgroundColor
}
@objc func pullToRefresh() {
// Start animation here.
nvActivityIndicator?.startAnimating()
}
I hope this will help you. 我希望这能帮到您。
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