SwiftUI中用WeatherKit判断当日是否降雨及获取下一小时预报

一、判断当日是否会降雨（含毛毛雨、雷暴等） #

核心思路是遍历当日所有小时的天气预报，检查是否存在降雨类天气状况。WeatherKit的WeatherCondition枚举包含了所有降雨相关的case（如.rain, .drizzle, .thunderstorm等），通过判断小时预报的condition是否属于这类即可确定当日是否有降雨。

实现代码 #

import WeatherKit
import CoreLocation

func willRainToday(for location: CLLocation) async -> Bool {
    let weatherService = WeatherService.shared
    do {
        let hourlyForecast = try await weatherService.hourlyWeather(for: location)
        // 筛选当日的小时预报
        let todayStart = Calendar.current.startOfDay(for: Date())
        let todayEnd = Calendar.current.date(byAdding: .day, value: 1, to: todayStart)!
        let todayForecasts = hourlyForecast.filter {
            $0.date >= todayStart && $0.date < todayEnd
        }
        // 定义所有降雨类天气类型
        let rainRelatedConditions: Set<WeatherCondition> = [
            .rain, .drizzle, .thunderstorm, .freezingRain, .freezingDrizzle
        ]
        // 判断是否存在降雨类天气
        return todayForecasts.contains { rainRelatedConditions.contains($0.condition) }
    } catch {
        print("获取小时预报失败: \(error.localizedDescription)")
        return false
    }
}

调用示例（SwiftUI视图中可通过Task执行）：

Task {
    let targetLocation = CLLocation(latitude: 31.23, longitude: 121.47) // 替换为目标位置
    let hasRain = await willRainToday(for: targetLocation)
    print("今日是否有降雨: \(hasRain)")
}

二、获取当前时间的下一小时天气状况 #

通过筛选小时预报数组，找到当前时间之后的第一个小时预报条目，从中提取符号名称和温度即可。

实现代码 #

func nextHourWeather(for location: CLLocation) async -> (symbolName: String, temperature: String)? {
    let weatherService = WeatherService.shared
    do {
        let hourlyForecast = try await weatherService.hourlyWeather(for: location)
        let now = Date()
        // 找到当前时间之后的第一个小时预报
        guard let nextHourForecast = hourlyForecast.first(where: { $0.date > now }) else {
            return nil
        }
        // 格式化温度为可读字符串
        let tempFormatter = MeasurementFormatter()
        tempFormatter.unitStyle = .short
        let tempString = tempFormatter.string(from: nextHourForecast.temperature)
        return (nextHourForecast.symbolName, tempString)
    } catch {
        print("获取小时预报失败: \(error.localizedDescription)")
        return nil
    }
}

调用示例：

Task {
    let targetLocation = CLLocation(latitude: 31.23, longitude: 121.47)
    if let nextHourData = await nextHourWeather(for: targetLocation) {
        print("下一小时天气符号: \(nextHourData.symbolName)，温度: \(nextHourData.temperature)")
    }
}

注意事项 #

• 确保项目已配置WeatherKit权限：在Info.plist中添加NSLocationWhenInUseUsageDescription（位置权限说明），并在Xcode的Signing & Capabilities中添加WeatherKit服务。
• 若已有获取天气的逻辑，可将上述代码整合到现有函数中，避免重复创建WeatherService实例。

内容的提问来源于stack exchange，提问作者helloimbrando