In Swift 2.1, how should I create a class conforming NSCopying protocol?
I tried this:
class TargetValue: NSObject, NSCopying {
var value: Int?
func copyWithZone(zone: NSZone) -> AnyObject {
let copy = TargetValue()
copy.value = value
return copy
}
}
var target = TargetValue()
target.value = 12
var target1 = target.copy()
print(target1.value ) // ambiguous user of 'value'
But I hit the error of ambiguous user of value
. What should I do to fix this problem?
Regards
copyWithZone:
返回AnyObject
,因此您必须将副本转换为所需的类型:
var target1 = target.copy() as! TargetValue
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