Expression type '(_, _.Stride) & # 8594; _ 'is ambiguous with no additional context
Help! I am facing the error "Expression type" (_, _.Stride) → _ 'ambiguous without extra context ". Does anyone know why this is happening and there is a solution? I am using Swift 4.
Code:
let offsetTime = 0
DispatchQueue.main.asyncAfter(deadline: .now() + offsetTime) { //Expression type '(_, _.Stride) -> _' is ambiguous without more context
self.currentTaskForUser.text = "Starting\n" + note + "in"
self.timerDown(from: 3, to: 1)
}
DispatchQueue.main.asyncAfter(deadline: .now() + offsetTime + 3) { //Expression type '(_, _.Stride) -> _' is ambiguous without more context
self.currentTaskForUser.text = note
let difficultyValue = Int(self.difficultyControl.titleForSegment(at: self.difficultyLevel.selectedSegmentIndex)!)!
self.timerUp(from: 1, to: difficultyValue)
self.offsetTime += 13
}
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The expression .now()
returns a type DispatchTime
, which is a structure.
let offsetTime = 0
initializes the variable as Int
. The error is misleading, practically it is a type mismatch
Although the compiler can infer the type of a numeric literal
DispatchQueue.main.asyncAfter(deadline: .now() + 3)
The most reliable way to add a literal or variable Int
to a value DispatchTime
is DispatchTimeInterval
with an associated value event .
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(offsetTime)
and
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(offsetTime) + .seconds(3))
There are four enumeration cases DispatchTimeInterval
-
.seconds(Int)
-
.milliseconds(Int)
-
.microseconds(Int)
-
.nanoseconds(Int)
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