swift - 错误 'cannot convert value of type ' int' 到预期参数类型 'UInt'

Question

在线

var anchor = HKQueryAnchor(fromValue: Int(HKAnchoredObjectQueryNoAnchor))

我得到红旗错误

cannot convert value of type 'Int' to expected argument type 'Uint'

我从另一个 Xcode 项目复制粘贴了代码，这在另一个项目中没有为这一行带来错误(仅在 watchOS 上读取心率)。

有什么想法吗？

let healthStore = HKHealthStore()

//State of the app - is the workout activated
var workoutActive = false

// define the activity type and location
var workoutSession : HKWorkoutSession?
let heartRateUnit = HKUnit(fromString: "count/min")
var anchor = HKQueryAnchor(fromValue: Int(HKAnchoredObjectQueryNoAnchor))

Answer 1

错误是告诉你你必须做什么。只需更改代码:

var anchor = HKQueryAnchor(fromValue: UInt(HKAnchoredObjectQueryNoAnchor))

您需要将 Int 更改为 UInt，这是 HKQueryAnchor 所期望的。