尝试在SwiftUI中添加一个全屏活动指示器。
我可以在视图协议中使用.overlay(overlay:)函数。
有了这个，我可以做任何视图叠加，但我找不到iOS默认风格UIActivityIndicatorView等效的SwiftUI。
如何使用SwiftUI创建默认样式微调器?
注意:这不是关于在UIKit框架中添加活动指示器。
当前回答
SwiftUI中的活动指标
import SwiftUI
struct Indicator: View {
@State var animateTrimPath = false
@State var rotaeInfinity = false
var body: some View {
ZStack {
Color.black
.edgesIgnoringSafeArea(.all)
ZStack {
Path { path in
path.addLines([
.init(x: 2, y: 1),
.init(x: 1, y: 0),
.init(x: 0, y: 1),
.init(x: 1, y: 2),
.init(x: 3, y: 0),
.init(x: 4, y: 1),
.init(x: 3, y: 2),
.init(x: 2, y: 1)
])
}
.trim(from: animateTrimPath ? 1/0.99 : 0, to: animateTrimPath ? 1/0.99 : 1)
.scale(50, anchor: .topLeading)
.stroke(Color.yellow, lineWidth: 20)
.offset(x: 110, y: 350)
.animation(Animation.easeInOut(duration: 1.5).repeatForever(autoreverses: true))
.onAppear() {
self.animateTrimPath.toggle()
}
}
.rotationEffect(.degrees(rotaeInfinity ? 0 : -360))
.scaleEffect(0.3, anchor: .center)
.animation(Animation.easeInOut(duration: 1.5)
.repeatForever(autoreverses: false))
.onAppear(){
self.rotaeInfinity.toggle()
}
}
}
}
struct Indicator_Previews: PreviewProvider {
static var previews: some View {
Indicator()
}
}
其他回答
如果你想要一个swift-ui风格的解决方案，那么神奇的是:
import Foundation
import SwiftUI
struct ActivityIndicator: View {
@State private var isAnimating: Bool = false
var body: some View {
GeometryReader { (geometry: GeometryProxy) in
ForEach(0..<5) { index in
Group {
Circle()
.frame(width: geometry.size.width / 5, height: geometry.size.height / 5)
.scaleEffect(calcScale(index: index))
.offset(y: calcYOffset(geometry))
}.frame(width: geometry.size.width, height: geometry.size.height)
.rotationEffect(!self.isAnimating ? .degrees(0) : .degrees(360))
.animation(Animation
.timingCurve(0.5, 0.15 + Double(index) / 5, 0.25, 1, duration: 1.5)
.repeatForever(autoreverses: false))
}
}
.aspectRatio(1, contentMode: .fit)
.onAppear {
self.isAnimating = true
}
}
func calcScale(index: Int) -> CGFloat {
return (!isAnimating ? 1 - CGFloat(Float(index)) / 5 : 0.2 + CGFloat(index) / 5)
}
func calcYOffset(_ geometry: GeometryProxy) -> CGFloat {
return geometry.size.width / 10 - geometry.size.height / 2
}
}
简单地使用:
ActivityIndicator()
.frame(width: 50, height: 50)
希望能有所帮助!
使用示例:
ActivityIndicator()
.frame(width: 200, height: 200)
.foregroundColor(.orange)
我的2美分的漂亮和更简单的代码的batuhankrbb，显示使用定时器中的ispresents…或者其他东西…(我将使用它在url回调..)
//
// ContentView.swift
//
// Created by ing.conti on 27/01/21.
import SwiftUI
struct ActivityIndicatorView: View {
@Binding var isPresented:Bool
var body: some View {
if isPresented{
ZStack{
RoundedRectangle(cornerRadius: 15).fill(Color.gray.opacity(0.1))
ProgressView {
Text("Loading...")
.font(.title2)
}
}.frame(width: 120, height: 120, alignment: .center)
.background(RoundedRectangle(cornerRadius: 25).stroke(Color.gray,lineWidth: 2))
}
}
}
struct ContentView: View {
@State var isPresented = false
@State var counter = 0
var body: some View {
VStack{
Text("Hello, world! \(counter)")
.padding()
ActivityIndicatorView(isPresented: $isPresented)
}.onAppear(perform: {
_ = startRefreshing()
})
}
func startRefreshing()->Timer{
let timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { timer in
counter+=1
print(counter)
if counter>2{
isPresented = true
}
if counter>4{
isPresented = false
timer.invalidate()
}
}
return timer
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
除了Mojatba Hosseini的回答，
我做了一些更新，这样就可以把它放在一个快速包中:
活动指标:
import Foundation
import SwiftUI
import UIKit
public struct ActivityIndicator: UIViewRepresentable {
public typealias UIView = UIActivityIndicatorView
public var isAnimating: Bool = true
public var configuration = { (indicator: UIView) in }
public init(isAnimating: Bool, configuration: ((UIView) -> Void)? = nil) {
self.isAnimating = isAnimating
if let configuration = configuration {
self.configuration = configuration
}
}
public func makeUIView(context: UIViewRepresentableContext<Self>) -> UIView {
UIView()
}
public func updateUIView(_ uiView: UIView, context:
UIViewRepresentableContext<Self>) {
isAnimating ? uiView.startAnimating() : uiView.stopAnimating()
configuration(uiView)
}}
扩展:
public extension View where Self == ActivityIndicator {
func configure(_ configuration: @escaping (Self.UIView) -> Void) -> Self {
Self.init(isAnimating: self.isAnimating, configuration: configuration)
}
}
struct ContentView: View {
@State private var isCircleRotating = true
@State private var animateStart = false
@State private var animateEnd = true
var body: some View {
ZStack {
Circle()
.stroke(lineWidth: 10)
.fill(Color.init(red: 0.96, green: 0.96, blue: 0.96))
.frame(width: 150, height: 150)
Circle()
.trim(from: animateStart ? 1/3 : 1/9, to: animateEnd ? 2/5 : 1)
.stroke(lineWidth: 10)
.rotationEffect(.degrees(isCircleRotating ? 360 : 0))
.frame(width: 150, height: 150)
.foregroundColor(Color.blue)
.onAppear() {
withAnimation(Animation
.linear(duration: 1)
.repeatForever(autoreverses: false)) {
self.isCircleRotating.toggle()
}
withAnimation(Animation
.linear(duration: 1)
.delay(0.5)
.repeatForever(autoreverses: true)) {
self.animateStart.toggle()
}
withAnimation(Animation
.linear(duration: 1)
.delay(1)
.repeatForever(autoreverses: true)) {
self.animateEnd.toggle()
}
}
}
}
}
SwiftUI中的活动指标
import SwiftUI
struct Indicator: View {
@State var animateTrimPath = false
@State var rotaeInfinity = false
var body: some View {
ZStack {
Color.black
.edgesIgnoringSafeArea(.all)
ZStack {
Path { path in
path.addLines([
.init(x: 2, y: 1),
.init(x: 1, y: 0),
.init(x: 0, y: 1),
.init(x: 1, y: 2),
.init(x: 3, y: 0),
.init(x: 4, y: 1),
.init(x: 3, y: 2),
.init(x: 2, y: 1)
])
}
.trim(from: animateTrimPath ? 1/0.99 : 0, to: animateTrimPath ? 1/0.99 : 1)
.scale(50, anchor: .topLeading)
.stroke(Color.yellow, lineWidth: 20)
.offset(x: 110, y: 350)
.animation(Animation.easeInOut(duration: 1.5).repeatForever(autoreverses: true))
.onAppear() {
self.animateTrimPath.toggle()
}
}
.rotationEffect(.degrees(rotaeInfinity ? 0 : -360))
.scaleEffect(0.3, anchor: .center)
.animation(Animation.easeInOut(duration: 1.5)
.repeatForever(autoreverses: false))
.onAppear(){
self.rotaeInfinity.toggle()
}
}
}
}
struct Indicator_Previews: PreviewProvider {
static var previews: some View {
Indicator()
}
}
