没有使用objective-c分配给属性swift 3的setter方法 [英] No setter method for assignment to property swift 3 with objective-c

问题描述

我在我的一个 swift 类中使用以下代码:

I am using below code in one of my swift classes:

    import UIKit

public class BRUFIMobile: NSObject {

    public var mobileNumber : NSString?
    public var provider : NSString?
    public var aliasName: NSString?
    public var aliasName_en : NSString?
    @objc public var isDefault: Bool

    public override init() {
        self.isDefault = false
        super.init()
    }

}

我的项目包含objective-c 和swift 代码.该代码在 xCode 7 上运行良好，但现在通过更新到 xCode 8，我得到以下错误:

My project contains both objective-c and swift codes. The code works fine on xCode 7 but now by updating to xCode 8 I get below error:

No setter method 'setIsDefault:' for assignment to property

我在我的objective-c 代码中使用属性，如下所示:

I use the attribute in my objective-c code like below:

   + (BRUFIMobile *) convertUFIMobileToBRUFIMobile:(UFIMobile *) ufimobile
{
    BRUFIMobile *brUFIMobile = [[BRUFIMobile alloc] init];
    brUFIMobile.mobileNumber = ufimobile.number;
    brUFIMobile.provider = ufimobile.provider;
    brUFIMobile.aliasName = ufimobile.aliasName;
    brUFIMobile.aliasName_en = ufimobile.aliasName_en;
    brUFIMobile.isDefault = [ufimobile.isDefault boolValue];

    return brUFIMobile;
}

现在是否需要手动定义 Seetter?

is it now neccessary to define seetters manually?

推荐答案

Swift 3 beta 对带有前导 is 的属性进行了特殊处理.对于属性isDefault，Swift 生成isDefault 作为getter 和setDefault: 作为setter(不是setIsDefault:).

Swift 3 beta makes special treatment for properties with leading is. For the property isDefault, Swift generates isDefault as getter and setDefault: as setter (not setIsDefault:).

在您的 Objective-C 代码中使用 setDefault:，或将其设为计算属性并手动指定 @objc 名称.

Use setDefault: in your Objective-C code, or make it a computed property and give @objc names manually.

(补充)使其成为计算属性"的意思是这样的:

(Addition) "make it a computed property" means something like this:

private var _default: Bool = false
public var isDefault: Bool {
    @objc(isDefault) get {
        return _default
    }
    @objc(setIsDefault:) set {
        self._default = newValue
    }
}

<小时>

(更新)据我测试，这似乎有效:

---

(Update) As far as I tested, this seems to work:

@objc(isDefault) public var isDefault: Bool

比使其成为计算属性"简单一点.请尝试.

A little bit simpler than "making it a computed property". Please try.

(更新 2)

Apple 工作人员已确认这是一个已知问题，将在未来的测试版中修复:"https://github.com/apple/swift/pull/3254

Apple Staff has confirmed that "This is a known issue that will be fixed in a future beta:" https://github.com/apple/swift/pull/3254

这不是 Core Data 案例.但此修复程序也适用于此问题.(很遗憾，就目前而言，Xcode 8 beta 2 不包含此修复程序.)

This is not a Core Data case. But the fix will work for this issue as well. (It's a pity, as for now, Xcode 8 beta 2 does not include this fix.)

(更新 3)在 Xcode 8 beta 3 Release Notes 中说这个功能被删除了，我已经确认，没有 @objc 属性，Objective-C setter setIsDefault: 可用于Bool 属性 isDefault.

(Update3) It is said in Xcode 8 beta 3 Release Notes that this feature is removed and I have confirmed that, with no @objc attribute, Objective-C setter setIsDefault: is available for Bool property isDefault.

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