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Easy closure based access to UIControl events (instead of target/action)
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protocol ControlEventBindable: class { } | |
extension UIControl: ControlEventBindable { } | |
extension UIBarButtonItem: ControlEventBindable { } | |
private struct Keys { | |
static var EventHandlers = "_EventHandlers" | |
} | |
// MARK: - Implementation | |
extension ControlEventBindable where Self: UIControl { | |
private var eventHandlers: [ControlEventHandler<Self>] { | |
get { return (objc_getAssociatedObject(self, &Keys.EventHandlers) as? [ControlEventHandler<Self>]) ?? [] } | |
set { objc_setAssociatedObject(self, &Keys.EventHandlers, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) } | |
} | |
/// Listen for `UIControlEvents` executing the provided closure when triggered | |
func on(_ events: UIControlEvents, call closure: @escaping (Self) -> Void) { | |
let handler = ControlEventHandler<Self>(sender: self, events: events, closure: closure) | |
self.eventHandlers.append(handler) | |
} | |
} | |
extension ControlEventBindable where Self: UIBarButtonItem { | |
private var eventHandlers: [BarButtonItemEventHandler<Self>] { | |
get { return (objc_getAssociatedObject(self, &Keys.EventHandlers) as? [BarButtonItemEventHandler<Self>]) ?? [] } | |
set { objc_setAssociatedObject(self, &Keys.EventHandlers, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) } | |
} | |
init(barButtonSystemItem: UIBarButtonSystemItem, closure: @escaping (Self) -> Void) { | |
self.init(barButtonSystemItem: barButtonSystemItem, target: nil, action: nil) | |
self.eventHandlers.append(BarButtonItemEventHandler<Self>(sender: self, closure: closure)) | |
} | |
init(title: String?, style: UIBarButtonItemStyle, closure: @escaping (Self) -> Void) { | |
self.init(title: title, style: style, target: nil, action: nil) | |
self.eventHandlers.append(BarButtonItemEventHandler<Self>(sender: self, closure: closure)) | |
} | |
} | |
private final class ControlEventHandler<Sender: UIControl>: NSObject { | |
let closure: (Sender) -> Void | |
init(sender: Sender, events: UIControlEvents, closure: @escaping (Sender) -> Void) { | |
self.closure = closure | |
super.init() | |
sender.addTarget(self, action: #selector(self.action), for: events) | |
} | |
@objc private func action(sender: UIControl) { | |
guard let sender = sender as? Sender else { return } | |
self.closure(sender) | |
} | |
} | |
private final class BarButtonItemEventHandler<Sender: UIBarButtonItem>: NSObject { | |
private let closure: (Sender) -> Void | |
private let cleanup: () -> Void | |
init(sender: Sender, closure: @escaping (Sender) -> Void) { | |
self.closure = closure | |
self.cleanup = { | |
sender.target = nil | |
sender.action = nil | |
} | |
super.init() | |
sender.target = self | |
sender.action = #selector(self.action) | |
} | |
deinit { cleanup() } | |
@objc private func action(sender: UIBarButtonItem) { | |
guard let sender = sender as? Sender else { return } | |
self.closure(sender) | |
} | |
} |
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let button = UIButton() | |
button.on(.touchUpInside) { button in | |
//use button as a UIButton | |
} | |
let barButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel) { button in | |
//use barbutton | |
} |
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MIT License | |
Copyright (c) [year] [fullname] | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all | |
copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
SOFTWARE. |
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updated to include
UIBarButtonItem
s