Swift Generic UIPickerView
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
class PickerSource : NSObject, UIPickerViewDelegate, UIPickerViewDataSource { | |
var data: [[String]] = [] | |
var selectionUpdated: ((component: Int, row: Int) -> Void)? | |
// MARK: UIPickerViewDataSource | |
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int { | |
return data.count | |
} | |
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { | |
let rows = data[component] | |
return rows.count | |
} | |
// MARK: UIPickerViewDelegate | |
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! { | |
return "\(data[component][row])" | |
} | |
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { | |
selectionUpdated?(component: component, row: row) | |
} | |
} | |
class Picker<T : Printable> : UIPickerView { | |
var data: [[T]] = [] { | |
didSet { | |
source.data = data.map { $0.map { "\($0)" } } | |
reloadAllComponents() | |
} | |
} | |
var selectionUpdated: ((selections: [T?]) -> Void)? | |
private let source = PickerSource() | |
// MARK: Initialization | |
convenience init() { | |
self.init(frame: CGRectZero) | |
} | |
convenience init(data: [[T]]) { | |
self.init(frame: CGRectZero) | |
self.data = data | |
} | |
override init(frame: CGRect) { | |
super.init(frame: frame) | |
setup() | |
} | |
required init(coder aDecoder: NSCoder) { | |
super.init(coder: aDecoder) | |
setup() | |
} | |
// MARK: Setup | |
private func setup() { | |
dataSource = source | |
delegate = source | |
source.selectionUpdated = { [weak self] component, row in | |
if let _self = self { | |
var selections: [T?] = [] | |
for (idx, componentData) in enumerate(_self.data) { | |
let selectedRow = _self.selectedRowInComponent(idx) | |
if selectedRow >= 0 { | |
selections.append(componentData[selectedRow]) | |
} else { | |
selections.append(nil) | |
} | |
} | |
_self.selectionUpdated?(selections: selections) | |
} | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment