Objective c Swift如何写入plist文件并更改值？

错误：“字符串”没有名为“setObject”的成员

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更改编码。我无法更改plist

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您将myDictionary声明为字符串（并用字符串文本初始化它）。我很确定你是想把它命名为字典。字符串和字典不是一回事

let plistPath = NSBundle.mainBundle().pathForResource("userConfig", ofType: "plist")
let dict = NSMutableDictionary(contentsOfFile: plistPath)
let data: (AnyObject!) = dict.objectForKey("baiduUrl")
var myDictionary: String = "http://www.baidu.com"
myDictionary.setObject(plistPath, forKey: "baiduUrl")
myDictionary.writeToFile(plistPath, atomically: false)
println(myDictionary)

您需要做的是（未经测试，相关部分）

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或者，如果您的词典不可更改，您可以将其创建为NSDictionary，直接将myString分配给您的密钥。

声明了myDictionary。仍然无法写入Plist。请使用新错误和新代码更新问题。更改编码。我无法更改Plist

var myDictionary: String = "http://www.baidu.com" // You say you have an String called myDictionary, not a dictionary
myDictionary.setObject(plistPath, forKey: "baiduUrl") // myDictionary is a String, so you can't set any object to it.

let myString:String = "http://www.baidu.com"
var myMutableDictionary = NSMutableDictionary()
myDictionary.setObject(myString, forKey:"baiduUrl")