Swift 3:无法将类型'NSMutableDictionary'的值转换为预期的参数类型'[AnyHashable:Any]！" [英] Swift 3: Cannot convert value of type 'NSMutableDictionary' to expected argument type '[AnyHashable : Any]!'

问题描述

此代码在Swift 3之前有效.(请问一下Swift 3！)

This code worked before Swift 3. (Curse you Swift 3!)

现在，它在Flurry.logEvent(eventName, withParameters: userData!)行上显示此错误:

Now it's showing this error against the Flurry.logEvent(eventName, withParameters: userData!) line:

无法将"NSMutableDictionary"类型的值转换为预期值 参数类型'[[AnyHashable:Any]！'

Cannot convert value of type 'NSMutableDictionary' to expected argument type '[AnyHashable : Any]!'

将userData!投射到[AnyHashable : Any]会产生此错误:

Casting userData! to [AnyHashable : Any] produces this error:

无法将类型"NSMutableDictionary"的值转换为类型 强制使用[[AnyHashable:Any]"

Cannot convert value of type 'NSMutableDictionary' to type '[AnyHashable : Any]' in coercion

func logEvent(_ eventName: String, userData: NSMutableDictionary?) {
    // Use <userData> or create new one?
    var userData = userData
    if userData == nil {
        userData = NSMutableDictionary()
    }

    // Set base properties
    userData!.setObject(gUser.tofus.count, forKey: "Num Tofus" as NSCopying)
    userData!.setObject(gUser.getLifetimeTofus(), forKey: "Num Lifetime Tofus" as NSCopying)

    // Call Flurry
    DispatchQueue.main.async {
        Flurry.logEvent(eventName, withParameters: userData! as [AnyHashable:Any])
    }
}

Swift 3的正确语法是什么?

What's the right syntax for Swift 3?

推荐答案

如果Flurry.logEvent(_:withParameters:)占用了[AnyHashable: Any]，为什么不将其用作本地userData?

If that Flurry.logEvent(_:withParameters:) takes [AnyHashable: Any], why don't you use it as your local userData?

func logEvent(_ eventName: String, userData: NSMutableDictionary?) {
    // Use <userData> or create new one?
    var userData = userData as NSDictionary? as? [AnyHashable: Any] ?? [:]
    
    // Set base properties
    userData["Num Tofus"] = gUser.tofus.count
    userData["Num Lifetime Tofus"] = gUser.getLifetimeTofus()
    
    // Call Flurry
    DispatchQueue.main.async {
        Flurry.logEvent(eventName, withParameters: userData)
    }
}

---

更新

Xcode 8.1 GM种子，包括 SE-0139 和

Xcode 8.1 GM seed including SE-0139 and SE-0140 is out, so the list below is updated.

当设置为[AnyHashable: Any]字典(或在[Any]数组中设置，或者只是传递给非空的Any时)，这些是 Objective-C安全类型. id在Objective-C中)传递给了Objective-C世界:

These are the Objective-C safe types, when set to a [AnyHashable: Any] dictionary (or set in a [Any] array, or simply passed to Any which is a non-null id in Objective-C) in which is passed to Objective-C world:

• 可选值，包括nil

nil转换为NSNull，所有非null的Optional都已解包.

nil is converted to NSNull, all non-nil Optionals are unwrapped.

(NSNull可能不是您想要的.对零校验仍然要小心.)

(NSNull may not be what you want. Still be careful about nil-checking.)

• 所有数字类型和Bool

• All numeric types and Bool

Int8，UInt8，Int16，UInt16，Int32，UInt32，Int64，UInt64以及 Int，UInt，Double，Float，CGFloat和Bool.这些将转换为NSNumber.

Int8, UInt8, Int16, UInt16, Int32, UInt32, Int64, UInt64, as well as Int, UInt, Double, Float, CGFloat and Bool. These are converted to NSNumber.

• String

已转换为NSString.

• Array，其中Element是Objective-C安全的

• Array, where Element is Objective-C safe

已转换为NSArray.

• Dictionary，其中Key和Value是Objective-C安全的

• Dictionary, where Key and Value are Objective-C safe

已转换为NSDictionary.

• Set，其中Element是Objective-C安全的

• Set, where Element is Objective-C safe

转换为NSSet

• NSObject后代类型

• NSObject descendent types

未转换，按原样使用.

• 具有对应引用类型的值类型

请参阅列表

值类型，其中NSValue具有用于的初始化器

• Value types where NSValue has an initializer for

NSRange， CGPoint， CGVector， CGSize， CGRect， CGAffineTransform， UIEdgeInsets， UIOffset， CATransform3D， CMTime， CMTimeRange， CMTimeMapping， CLLocationCoordinate2D， MKCoordinateSpan， SCNVector3， SCNVector4， SCNMatrix4. 这些类型将转换为NSValue. (NSRange在较早的Swifts中已经可以转换为NSValue，但是没有充分的文档.)

NSRange, CGPoint, CGVector, CGSize, CGRect, CGAffineTransform, UIEdgeInsets, UIOffset, CATransform3D, CMTime, CMTimeRange, CMTimeMapping, CLLocationCoordinate2D, MKCoordinateSpan, SCNVector3, SCNVector4, SCNMatrix4. These types are converted to NSValue. (NSRange was already convertible to NSValue in older Swifts, but not well-documented.)

即使在Swift 3.0.1.中，仍然有些值可能会转换为_SwiftValue.

Still some values may be converted to _SwiftValue even in Swift 3.0.1.

• 仅Swift类型，例如(仅Swift)枚举，结构，元组...

(请参见我还没有检查所有包装器的枚举和结构，但是其中一些(例如，从Notification.Name到NSString)似乎已经安全地转换了.

I haven't checked all wrapper enums and structs, but some of them (for example, Notification.Name to NSString) seem to be safely converted.

• 非可选数字类型和Bool

Int，UInt，Double，Float，CGFloat和Bool.这些将转换为NSNumber.

Int, UInt, Double, Float, CGFloat and Bool. These are converted to NSNumber.

• 非可选String

已转换为NSString.

• 非可选Array，其中Element是Objective-C安全的

• Non-Optional Array, where Element is Objective-C safe

已转换为NSArray.

• 非可选Dictionary，其中Key和Value是Objective-C安全的

• Non-Optional Dictionary, where Key and Value are Objective-C safe

已转换为NSDictionary.

• 非可选Set，其中Element是Objective-C安全的

• Non-Optional Set, where Element is Objective-C safe

转换为NSSet

• 非可选的NSObject后代类型

• Non-Optional NSObject descendent types

未转换，按原样使用.

• 具有对应部分引用类型的非可选值类型

请参阅列表

See the list here. (The linked article is updated for Swift 3.0.1.)

这些可能会转换为_SwiftValue，这在Objective-C的世界中是完全没有用的和灾难性的.

These may be converted to _SwiftValue, which is completely useless and disastrous in Objective-C world.

• Int8，UInt8，Int16，UInt16，Int32，UInt32，Int64，UInt64
• 任何可选值，包括nil
• 仅Swift类型，例如(仅Swift)枚举，结构，元组...

• Int8, UInt8, Int16, UInt16, Int32, UInt32, Int64, UInt64
• Any Optional values including nil
• Swift only types such as (Swift-only)enum, struct, tuple...

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