如何解决Scaled Metric 在 Apple Watch 上不起作用?
我正在尝试针对 Apple Watch 执行此操作:
@ScaledMetric var widthScale: CGFloat = 1
然后将 widthScale 应用于一些 SwiftUI View 元素的框架:
.frame(width: myFrame.width * widthScale,height: myHeight)
只是它根本没有改变。字体大小确实会发生变化,但 widthScale 始终保持 @ 1.0。
我理解错了吗?我发现了一个错误吗?它不应该在 WatchOS 上使用吗?
解决方法
使用下面的代码发现它确实有效。原则上,在模拟器和我的手表上。还是要弄清楚为什么上面的问题不起作用。
struct TextLabelsView: View {
var body: some View {
ScrollView(.vertical) {
DynamicResizingView()
}
}
}
struct DynamicResizingView: View {
@ScaledMetric(relativeTo: .largeTitle) var scaledLargeTitle: CGFloat = 10
@ScaledMetric(relativeTo: .title) var scaledTitle: CGFloat = 10
@ScaledMetric(relativeTo: .headline) var scaledHeadline: CGFloat = 10
@ScaledMetric(relativeTo: .subheadline) var scaledSubheadline: CGFloat = 10
@ScaledMetric(relativeTo: .body) var scaledBody: CGFloat = 10
@ScaledMetric(relativeTo: .callout) var scaledCallout: CGFloat = 10
@ScaledMetric(relativeTo: .caption) var scaledCaption: CGFloat = 10
@ScaledMetric(relativeTo: .footnote) var scaledFootnote: CGFloat = 10
@ScaledMetric() var scaledNothing: CGFloat = 10
var body: some View {
VStack(alignment: .leading) {
Text("Dynamic Base10").font(Font.system(size:10))
ScaledText(label: "LargeTitle",size: scaledLargeTitle)
ScaledText(label: "Title",size: scaledTitle)
ScaledText(label: "Headline",size: scaledHeadline)
ScaledText(label: "Subheadline",size: scaledSubheadline)
ScaledText(label: "Body",size: scaledBody)
ScaledText(label: "Callout",size: scaledCallout)
ScaledText(label: "Caption",size: scaledCaption)
ScaledText(label: "Footnote",size: scaledFootnote)
ScaledText(label: "Not Specified",size: scaledNothing)
}
}
}
struct ScaledText: View {
var label: String
var size: CGFloat
var body: some View {
Text("Scaled by \(label) to \(size,specifier: "%.2f")")
.font(Font.system(size: size))
}
}
struct TextLabelsView_Previews: PreviewProvider {
static var previews: some View {
TextLabelsView()
.environment(\.sizeCategory,ContentSizeCategory.accessibilityExtraExtraExtraLarge)
TextLabelsView()
.environment(\.sizeCategory,ContentSizeCategory.small)
}
}
通过这个,您可以看到不同 Font.TextStyle|s 的不同缩放因子。
,所以我通过反复试验发现了什么:
- @ScaledMetric 应该在它所应用的 View 中定义,而不是在其他地方的 struct Type 中定义。
- @ScaledMetric 值四舍五入到整个像素。因此,根据显示密度 x2 或 x3,它四舍五入为 1/2halfs 或 1/3rds。 使用此视图和预览查看不同比例的实际效果:
import SwiftUI
struct ScaledMetricText: View {
@ScaledMetric(relativeTo: .caption) var widthScaleHundred: CGFloat = 100.0
@ScaledMetric(relativeTo: .caption) var widthScaleTen: CGFloat = 10.0
@ScaledMetric(relativeTo: .caption) var widthScaleOne: CGFloat = 1.0
var body: some View {
VStack {
Text("Unscaled")
.fixedSize(horizontal: true,vertical: false)
.frame(width: 100)
.background(Color(.lightGray))
.padding(3)
Text("100 -> \(widthScaleHundred)")
.fixedSize(horizontal: true,vertical: false)
.frame(width: 100 * widthScaleHundred / 100)
.background(Color(.lightGray))
Text("10 -> \(widthScaleTen)")
.fixedSize(horizontal: true,vertical: false)
.frame(width: 100 * widthScaleTen / 10)
.background(Color(.lightGray))
.padding(3)
Text("1 -> \(widthScaleOne)")
.fixedSize(horizontal: true,vertical: false)
.frame(width: 100 * widthScaleOne)
.background(Color(.lightGray))
}
.font(.caption)
}
}
struct ScaledMetricText_Previews: PreviewProvider {
static var previews: some View {
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "Apple Watch Series 6 - 40mm"))
.environment(\.sizeCategory,ContentSizeCategory.small)
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "Apple Watch Series 3 - 38mm"))
.environment(\.sizeCategory,ContentSizeCategory.extraExtraExtraLarge)
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "Apple Watch Series 6 - 44mm"))
.environment(\.sizeCategory,ContentSizeCategory.small)
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "Apple Watch Series 3 - 42mm"))
.environment(\.sizeCategory,ContentSizeCategory.extraExtraExtraLarge)
}
}
或 iOS 预览:
struct ScaledMetricText_Previews: PreviewProvider {
static var previews: some View {
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "iPhone 8"))
.environment(\.sizeCategory,ContentSizeCategory.small)
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "iPhone 8"))
.environment(\.sizeCategory,ContentSizeCategory.extraExtraExtraLarge)
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "iPhone 12 Pro Max"))
.environment(\.sizeCategory,ContentSizeCategory.small)
ScaledMetricText()
.previewDevice(PreviewDevice(rawValue: "iPhone 12 Pro Max"))
.environment(\.sizeCategory,ContentSizeCategory.extraExtraExtraLarge)
}
}
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