Question

yourLabelName.text = [[NSString] stringWithFormat:@"The number of votes for Crepes is %d", voteCount1["votes"]];

我试图将上面的代码重写到Swift中，因为它目前用Objective-C编写。为了上下文，我尝试在列标题＆＃34; VoteCount＆＃34;下检索我的Parse数据库中的值，这恰好是类名。这是包含所有列的变量：

    var voteCount1 = PFObject(className: "VoteCount")
    voteCount1["votes"] = 0
    voteCount1["optionName"] = "crepes"

Answer 1

更新回答：

考虑到Thilo的评论......怎么样：

var voteCount1 = PFObject(className: "VoteCount")
let optionName = voteCount1["optionName"];
let votes      = voteCount1["votes"] as String;

yourNameLabel.text = "The number of votes for \(optionName) is \(votes)"

原始答案：

我认为应该是这样的：

var voteCount1 = PFObject(className: "VoteCount")
yourNameLabel.text = 
   "The number of votes for \(voteCount1["optionName"]) is \(voteCount1["votes"])"

Answer 2

Swift String类型有一个初始值设定项，就像[NSString stringWithFormat:]工厂方法一样：

yourLabelName.text = String(format: "The number of votes for Crepes is %d", voteCount1["votes"])

如何将此Objective-C行重写为Swift？

2 个答案: