Question

此Swift（Xcode）def draw_bbox(img, bbox, labels, confidence, colors=None, write_conf=False): global COLORS global classes if classes is None: classes = populate_class_labels() for i, label in enumerate(labels): if colors is None: color = COLORS[classes.index(label)] else: color = colors[classes.index(label)] if write_conf: label += ' ' + str(format(confidence[i] * 100, '.2f')) + '%' cv2.rectangle(img, (bbox[i][0],bbox[i][1]), (bbox[i][2],bbox[i][3]), color,-1) cv2.putText(img, label, (bbox[i][0],bbox[i][1]-10), cv2.FONT_HERSHEY_SIMPLEX, 0.5, color, 2) return img程序正确返回“ hello there”和“ cookies在哪里？”字符串。但是对于中间两个应该返回“向北！”返回“可能是任何东西”。我以为这是断点或多行字符串的问题，但这在Xcode工作场所和游乐场都发生：

ChatBot

Answer 1

您的问题是使用.lowercased（）-比较两个字符串是否都存在。同样，如果您使用case语句，这个问题对我来说看起来更好：请参见下文

struct MyQuestionAnswerer {
    func responseTo(question: String) -> String {

        let localQuestion = question.lowercased()
        question == String("where can I find the north pole?").lowercased()
        let defaultNumber = question.count % 3

        switch localQuestion {
        case String("hello there").lowercased() : return "Why hello there"
        case String("where should I go on holiday?").lowercased() : return "To the North!"
        case String("where can I find the north pole?").lowercased() : return "To the North!"
        case String("where are the cookies?").lowercased() : return "In the cookie jar!"
        default: if (defaultNumber == 0) {return "That really depends" } else {return "Could be anything"}
        }
    }
}

Answer 2

请阅读我在代码块中添加的注释

struct MyQuestionAnswerer {
func responseTo(question: String) -> String {

    let question = question.lowercased()  // <- Converts all the strings in your question into lower case

    let defaultNumber = question.count % 3

    if question == "hello there" {
        return "Why hello there"
    } else if question == "where should I go on holiday?" {  // <- I is upper case
        return "To the North!"
    } else if question == "where can I find the north pole?" {  // <- I is upper case
        return "To the North!"
    } else if question == "where are the cookies?" {
        return "In the cookie jar!"
    } else if defaultNumber == 0 {
        return "That really depends"
    } else if defaultNumber == 1 {
        return "Ask me again tomorrow"
    } else {
        return "Could be anything"
    }
}

}

因此，基本上，您正在将“ i ...应该在哪里”与“ I 应该在哪里”进行比较> ...”，因为此比较为假，并且与其他if块都不匹配，所以它会进入最后一个else块。

斯威夫特跳过“否则”

2 个答案: