Question

我创建了名为importStories()的方法，该方法使用第三方库Swifter调用getStatusesUserTimelineWithUserID方法从Twitter导入时间轴数据。问题是该方法在任何值设置为twitterData之前返回。任何建议表示赞赏。

func importStories() -> [String] {

    let twitterAccount = Swifter(REDACTED)

    var twitterData = [String]()

    twitterAccount.getStatusesUserTimelineWithUserID("REDACTED", count: 0, sinceID: nil, maxID: nil, trimUser: true, contributorDetails: false, includeEntities: true, success: { (statuses) -> Void in
        if statuses != nil {
            for var i=0; i<statuses!.count; i++ {
                twitterData.append(statuses![i]["text"].string!)
            }
        }
    }) { (error) -> Void in

    }

    return twitterData
}


public func getStatusesUserTimelineWithUserID(userID: String, count: Int?, sinceID: Int?, maxID: Int?, trimUser: Bool?, contributorDetails: Bool?, includeEntities: Bool?, success: ((statuses: [JSONValue]?) -> Void)?, failure: FailureHandler?) {
    var parameters: Dictionary<String, AnyObject> = ["user_id": userID]

    self.getTimelineAtPath("statuses/user_timeline.json", parameters: [:], count: count, sinceID: sinceID, maxID: maxID, trimUser: trimUser, contributorDetails: contributorDetails, includeEntities: includeEntities, success: success, failure: failure)
}

Answer 1

这是我经常使用的模式。它可以通过一些类型的比例看起来更好看，但我没有使用任何代码。

这里的关键是通过调用由调用代码提供的块来返回结果。

func importStoriesWithSuccess(success:(result: [String]) -> Void, failure: (error: NSError) -> Void) {

    let twitterAccount = Swifter(REDACTED)

    var twitterData = [String]()

    twitterAccount.getStatusesUserTimelineWithUserID("REDACTED", count: 0, sinceID: nil, maxID: nil, trimUser: true, contributorDetails: false, includeEntities: true, success: { (statuses) -> Void in
        if statuses != nil {
            for var i=0; i<statuses!.count; i++ {
                twitterData.append(statuses![i]["text"].string!)
            }
            success(result: twitterData)
        }
        }) { (error) -> Void in
            failure(error: error)
    }
}

正如cjcoax已经提到的，在你的代码中，在twitterAccount执行你提供给它的块之前返回了twitterData。这就是你的twitterData为空的原因。

Swift功能似乎无序执行

1 个答案: