如何将Swift Promise转化为React Native

Question

我正在将iOS本机SDK集成到React native中。有一个名为SDK.getCardData的函数，我想从RN使用它。我的第一次尝试是在闭包中调用resolve和reject：

import Foundation
import SDK
@objc(SwiftComponentManager)
class SwiftComponentManager: NSObject {

@objc
func getCardData(_ resolve: RCTPromiseResolveBlock, rejecter reject: RCTPromiseRejectBlock) -> Void {
let cardId: String = "test"
let secret: String = "test"
SDK.getCardData(cardId, secret: secret) { (cardData, error) in
if (error != nil) {
reject(String(format: "Card data request failed: %@", error!.localizedDescription))
} else {
let pan = cardData!.pan
let cvv = cardData!.cvv
resolve(String(format: "Card data fetched successfully, pan: %@, cvv: %@", pan, cvv))
}
}
}
@objc func testMethod() -> Void {
print("This Does appear")
}
}

不幸的是，这会引发以下错误：escaping closure captures non-escaping parameter 'resolve'。

第二次尝试：

import Foundation
import SDK
import Promises
@objc(SwiftComponentManager)
class SwiftComponentManager: NSObject {

@objc
func getCardData(_ resolve: RCTPromiseResolveBlock, rejecter reject: RCTPromiseRejectBlock) -> Promise<CardData?> {
let cardId: String = "test"
let secret: String = "test"
let promise = Promise<CardData?>()
SDK.getCardData(cardId, secret: secret) { (cardData, error) in
if (error != nil) {
promise.reject(error)
} else {
let pan = cardData!.pan
let cvv = cardData!.cvv
promise.resolve(cardData)
}
}

return promise
}
@objc func testMethod() -> Void {
print("This Does appear")
}
}

如何调用resolve&reject是否正确？函数返回Void是很重要的。

Answer 1

找到了答案，只需在参数中添加@escapeng：

@objc func fling(_ options: NSDictionary, resolver resolve: @escaping RCTPromiseResolveBlock, rejecter reject: @escaping RCTPromiseRejectBlock) -> Void {
...