Binding+onChange.swift (1765B)
1 // MIT License 2 // Copyright © Paul Hudson 3 // 4 // Permission is hereby granted, free of charge, to any person obtaining a copy of this software 5 // and associated documentation files (the "Software"), to deal in the Software without restriction, 6 // including without limitation the rights to use, copy, modify, merge, publish, distribute, 7 // sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is 8 // furnished to do so, subject to the following conditions: 9 // 10 // The above copyright notice and this permission notice shall be included in all copies or 11 // substantial portions of the Software. 12 // 13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 14 // BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 16 // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 17 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 18 // 19 import SwiftUI 20 21 /// Pass the handler directly to the Binding 22 extension Binding { 23 func onChange(_ handler: @escaping (Value) -> Void) -> Binding<Value> { 24 Binding ( 25 get: { self.wrappedValue }, 26 set: { newValue in 27 self.wrappedValue = newValue 28 handler(newValue) 29 } 30 ) 31 } 32 } 33 34 #if false 35 // use like this: 36 struct BindingView: View { 37 @State private var rating = 0.0 38 var body: some View { 39 Slider (value: $rating.onChange(sliderChanged)) 40 } 41 func sliderChanged(_ value: Double) { 42 print ("Rating changed to \(value)") 43 } 44 } 45 #endif