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SwiftUI-Animation - 宋明的博客
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<h1 class="title">
SwiftUI-Animation
</h1>
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<a href="http://apolla.cc">宋明</a>
<span style="color: #ccc;">|</span>
<span class="date"><i class="fa fa-calendar-check-o" aria-hidden="true"></i> 2023/03/18</span>
<span class="tran-posted-in">posted in</span>
<span class="posted-in"><a href='SwiftUI.html'><i class="fa fa-folder" aria-hidden="true"></i> SwiftUI</a></span>
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<article class="markdown-body single-content">
<h2><a id="%E6%98%BE%E6%80%A7%E5%8A%A8%E7%94%BB" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>显性动画</h2>
<p>只需在需要变化的组件键入animation 我们就能拥有基础的动画</p>
<pre class="line-numbers"><code class="language-swift">struct ContentView: View {
@State private var circleColorChanged = false
@State private var heartColorChanged = false
@State private var heartSizeChanged = false
var body: some View {
ZStack {
Circle()
.frame(width: 200, height: 200)
.foregroundColor(circleColorChanged ? Color(.systemGray5) : .red)
Image(systemName: "heart.fill")
.foregroundColor(heartColorChanged ? .red : .white)
.font(.system(size: 100))
.scaleEffect(heartSizeChanged ? 1.0 : 0.5)
}
.animation(.default, value: circleColorChanged)
.onTapGesture {
self.circleColorChanged.toggle()
self.heartColorChanged.toggle()
self.heartSizeChanged.toggle()
}
}
}
</code></pre>
<p><img src="media/16791176888920/16791179008332.gif" alt="2023-03-06_09-35-14 (1).gif" /></p>
<h3><a id="%E8%87%AA%E5%AE%9A%E4%B9%89%E5%8A%A8%E7%94%BB" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>自定义动画</h3>
<blockquote>
<p>SwiftUI 提供linear、easeIn、easeOut、easeInOut 与spring等动画方式<br />
如果上面的动画效果我们成下面的动画 就会产生心跳的动画</p>
</blockquote>
<pre class="line-numbers"><code class="language-swift"> .animation(.spring(response: 0.3, dampingFraction: 0.3, blendDuration: 0.3), value: circleColorChanged)
</code></pre>
<p>效果如下<br />
<img src="media/16791176888920/16791179008345.gif" alt="2023-03-06_09-42-44 (1).gif" /></p>
<h2><a id="%E9%9A%90%E6%80%A7%E5%8A%A8%E7%94%BB" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>隐性动画</h2>
<p>只需将状态变化包裹在withAnimation 中 就可以做到相同的动画</p>
<pre class="line-numbers"><code class="language-swift">
struct ContentView: View {
@State private var circleColorChanged = false
@State private var heartColorChanged = false
@State private var heartSizeChanged = false
var body: some View {
ZStack {
Circle()
.frame(width: 200, height: 200)
.foregroundColor(circleColorChanged ? Color(.systemGray5) : .red)
Image(systemName: "heart.fill")
.foregroundColor(heartColorChanged ? .red : .white)
.font(.system(size: 100))
.scaleEffect(heartSizeChanged ? 1.0 : 0.5)
}
.onTapGesture {
withAnimation(.spring(response: 0.3, dampingFraction: 0.3, blendDuration: 0.3)) {
self.circleColorChanged.toggle()
self.heartColorChanged.toggle()
self.heartSizeChanged.toggle()
}
}
}
}
</code></pre>
<blockquote>
<p>注： 如果某一种动画不需要 可以直接移到withAnimation 外即可 例如：心形大小不要</p>
</blockquote>
<pre class="line-numbers"><code class="language-swift"> .onTapGesture {
withAnimation(.spring(response: 0.3, dampingFraction: 0.3, blendDuration: 0.3)) {
self.circleColorChanged.toggle()
self.heartColorChanged.toggle()
}
self.heartSizeChanged.toggle()
}
</code></pre>
<p><img src="media/16791176888920/16791179008363.gif" alt="2023-03-06_09-49-36 (1).gif" /></p>
<h2><a id="rotationeffect%E5%AE%9E%E7%8E%B0%E4%B8%8B%E8%BD%BD%E8%BF%9B%E5%BA%A6%E6%9D%A1" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>RotationEffect 实现下载进度条</h2>
<h3><a id="%E5%9F%BA%E7%A1%80%E7%94%A8%E6%B3%95" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>基础用法</h3>
<pre class="line-numbers"><code class="language-swift"> Circle()
.trim(from: 0, to: 0.9)
.stroke(Color.green, lineWidth: 5)
.frame(width: 100, height: 100)
.rotationEffect(Angle(degrees: isLoading ? 360 : 0))
.animation(.default.repeatForever(autoreverses: false), value: isLoading)
//出现在画面上
.onAppear() {
self.isLoading = true
}
</code></pre>
<p><img src="media/16791176888920/16791179008384.gif" alt="2023-03-06_13-49-19 (1).gif" /></p>
<h3><a id="%E5%B5%8C%E5%A5%97%E4%BD%BF%E7%94%A8%E5%9C%86%E5%BD%A2" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>嵌套使用圆形</h3>
<pre class="line-numbers"><code class="language-swift"> ZStack{
Circle()
.trim(from: 0, to: 1)
.stroke(Color(.systemGray5), lineWidth: 20)
.frame(width: 100, height: 100)
Circle()
.trim(from: 0, to: 0.3)
.stroke(Color.green, lineWidth: 10)
.frame(width: 100, height: 100)
.rotationEffect(Angle(degrees: isLoading ? 360 : 0))
.animation(.linear(duration: 3).repeatForever(autoreverses: false), value: isLoading)
}
//出现在画面上
.onAppear() {
self.isLoading = true
}
</code></pre>
<p><img src="media/16791176888920/16791179008407.gif" alt="2023-03-06_13-57-11 (1).gif" /></p>
<h3><a id="%E7%9B%B4%E7%BA%BF%E8%BF%9B%E5%BA%A6%E6%9D%A1" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>直线进度条</h3>
<p>RoundedRectangle 圆角矩形</p>
<pre class="line-numbers"><code class="language-swift"> ZStack {
Text("Loading")
.font(.system(.body, design: .rounded))
.bold()
.offset(x: 0, y: -25)
RoundedRectangle(cornerRadius: 3)
.stroke(Color(.systemGray5), lineWidth: 10)
.frame(width: 250, height: 3)
RoundedRectangle(cornerRadius: 3)
.stroke(Color.green, lineWidth: 10)
.frame(width: 30, height: 3)
.offset(x: isLoading ? 110 : -110, y: 0)
.animation(.linear(duration: 1).repeatForever(autoreverses: false), value: isLoading)
}
.onAppear() {
self.isLoading = true
}
</code></pre>
<p><img src="media/16791176888920/16791179008431.gif" alt="2023-03-06_14-00-12 (1).gif" /></p>
<h3><a id="%E4%BD%BF%E7%94%A8timer%E6%9B%B4%E6%96%B0%E4%B8%8B%E8%BD%BD%E8%BF%9B%E5%BA%A6" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>使用Timer 更新下载进度</h3>
<pre class="line-numbers"><code class="language-swift">struct ContentView: View {
@State private var progress = 0.0
var body: some View {
ZStack{
Text("\(Int(progress * 100))%")
.font(.system(.title, design: .rounded))
.bold()
Circle()
.trim(from: 0, to: 1)
.stroke(Color(.systemGray5), lineWidth: 20)
.frame(width: 200, height: 200)
Circle()
.trim(from: 0, to: progress)
.stroke(Color.green, lineWidth: 20)
.frame(width: 200, height: 200)
.rotationEffect(Angle(degrees: -90))
}
//出现在画面上
.onTapGesture {
Timer.scheduledTimer(withTimeInterval: 0.5, repeats: true) { timer in
self.progress += 0.05
if self.progress >= 1.0 {
timer.invalidate()
}
}
}
}
}
</code></pre>
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