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
我使用SwiftUI实现了经典的UIKit指示器。 点击这里查看活动指示器的运行情况
struct ActivityIndicator: View {
@State private var currentIndex: Int = 0
func incrementIndex() {
currentIndex += 1
DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(50), execute: {
self.incrementIndex()
})
}
var body: some View {
GeometryReader { (geometry: GeometryProxy) in
ForEach(0..<12) { index in
Group {
Rectangle()
.cornerRadius(geometry.size.width / 5)
.frame(width: geometry.size.width / 8, height: geometry.size.height / 3)
.offset(y: geometry.size.width / 2.25)
.rotationEffect(.degrees(Double(-360 * index / 12)))
.opacity(self.setOpacity(for: index))
}.frame(width: geometry.size.width, height: geometry.size.height)
}
}
.aspectRatio(1, contentMode: .fit)
.onAppear {
self.incrementIndex()
}
}
func setOpacity(for index: Int) -> Double {
let opacityOffset = Double((index + currentIndex - 1) % 11 ) / 12 * 0.9
return 0.1 + opacityOffset
}
}
struct ActivityIndicator_Previews: PreviewProvider {
static var previews: some View {
ActivityIndicator()
.frame(width: 50, height: 50)
.foregroundColor(.blue)
}
}
基本活动指标结果:
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()
}
}
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()
}
}
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)
