快速获取字典数组的最大值和平均值
[英]Get max and average values from an array of dictionaries swift
问题描述
I have an array (filled by NSUserDefaults: Defaults.arrayForKey("onLine") as! [[String:AnyObject]]) and how can I get the average and max values from SPEED? 
我有一个数组（由NSUserDefaults：Defaults.arrayForKey（“ onLine”）填充为[[String：AnyObject]]），如何从SPEED获取平均值和最大值？
I Tried online.max!["SPEED"] but didn't work 我尝试了online.max！[“ SPEED”]，但是没有用
Any helps? 有帮助吗？
[["LONGITUDE: ": -122.02211045, "BEARING: ": 263.41, "LATITUDE: ": 37.32475565, "SPEED: ": 3.76, "TIMESTAMP: ": 2016-10-19T02:09:49.535Z], ["LONGITUDE: ": -122.02230437, "BEARING: ": 270.15, "LATITUDE: ": 37.32475499, "SPEED: ": 3.15, "TIMESTAMP: ": 2016-10-19T02:09:54.518Z], ["LONGITUDE: ": -122.02249983, "BEARING: ": 265.56, "LATITUDE: ": 37.32475587, "SPEED: ": 3.27, "TIMESTAMP: ": 2016-10-19T02:09:59.516Z]] [[[“ LONGITUDE：”：-122.02211045，“ BEARING：”：263.41，“ LATITUDE：”：37.32475565，“ SPEED：”：3.76，“ TIMESTAMP：”：2016-10-19T02：09：49.535Z]，[“ LONGITUDE：“：-122.02230437，” BEARING：“：270.15，” LATITUDE：“：37.32475499，” SPEED：“：3.15，” TIMESTAMP：“：2016-10-19T02：09：54.518Z]，[” LONGITUDE：“ ：-122.02249983，“ BEARING：”：265.56，“ LATITUDE：”：37.32475587，“ SPEED：”：3.27，“ TIMESTAMP：”：2016-10-19T02：09：59.516Z]]
1 个解决方案
解决方案1
0 已采纳 2016-10-24 10:53:02
I fixed it my self with this code 我用这段代码修复了自己
speedArray.append(userLocation.speed * 1.94384)
let avgSpeed = speedArray.reduce(0, combine: +) / Double(speedArray.count)
let maxSpeed = speedArray.maxElement()
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