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Add the .task modifier to view its lifecycle #2

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Add the .task modifier to view its lifecycle #2

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17 changes: 17 additions & 0 deletions ViewLifecycle/LifecycleMonitor.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@ struct LifecycleMonitor: View {
var label: String
@State private var stateTimestamp: Date = .now
@State private var onAppearTimestamp: Date? = nil
@State private var taskStartTimestamp: Date? = nil
@State private var onDisappearTimestamp: Date? = nil
@State private var color: Color = .random()

Expand Down Expand Up @@ -35,6 +36,14 @@ struct LifecycleMonitor: View {
.monospacedDigit()
}
.help("When onDisappear was last called for this view")

GridRow(alignment: .firstTextBaseline) {
Text("task")
Text(timestampLabel(for: taskStartTimestamp))
.monospacedDigit()
}
.help("When task was last called for this view")

}
.font(.callout)
}
Expand All @@ -60,6 +69,14 @@ struct LifecycleMonitor: View {
onDisappearTimestamp = timestamp
}
}
.task {
let timestamp = Date.now
print("\(timestamp) \(label): task started")
let animation: Animation? = taskStartTimestamp == nil ? nil : .easeOut(duration: 1)
withAnimation(animation) {
taskStartTimestamp = timestamp
}
}
}

private func timestampLabel(for timestamp: Date?) -> LocalizedStringKey {
Expand Down