我在玩苹果的新Swift编程语言，遇到了一些问题…
目前我试图读取一个plist文件，在Objective-C中，我会做以下工作来获取内容作为NSDictionary:
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Config" ofType:@"plist"];
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:filePath];
我如何得到一个plist作为一个字典在Swift?
我假设我可以得到路径到plist:
let path = NSBundle.mainBundle().pathForResource("Config", ofType: "plist")
当这工作(如果它是正确的?):我如何获得内容作为一个字典?
还有一个更普遍的问题:
是否可以使用默认的NS*类?我想是的……还是我遗漏了什么?据我所知，默认框架NS*类仍然有效，可以使用吗?
当前回答
斯威夫特3.0
如果你想从.plist读取一个“二维数组”，你可以这样尝试:
if let path = Bundle.main.path(forResource: "Info", ofType: "plist") {
if let dimension1 = NSDictionary(contentsOfFile: path) {
if let dimension2 = dimension1["key"] as? [String] {
destination_array = dimension2
}
}
}
其他回答
我使用swift字典，但在我的文件管理器类中转换它们和nsdictionary，如下所示:
func writePlist(fileName:String, myDict:Dictionary<String, AnyObject>){
let docsDir:String = dirPaths[0] as String
let docPath = docsDir + "/" + fileName
let thisDict = myDict as NSDictionary
if(thisDict.writeToFile(docPath, atomically: true)){
NSLog("success")
} else {
NSLog("failure")
}
}
func getPlist(fileName:String)->Dictionary<String, AnyObject>{
let docsDir:String = dirPaths[0] as String
let docPath = docsDir + "/" + fileName
let thisDict = NSDictionary(contentsOfFile: docPath)
return thisDict! as! Dictionary<String, AnyObject>
}
这似乎是最不麻烦的读写方式，但让我的其余代码保持尽可能快。
能在一行内完成吗
var dict = NSDictionary(contentsOfFile: NSBundle.mainBundle().pathForResource("Config", ofType: "plist"))
我已经创建了一个简单的字典初始化器替换NSDictionary(contentsOfFile: path)。只要去掉NS。
extension Dictionary where Key == String, Value == Any {
public init?(contentsOfFile path: String) {
let url = URL(fileURLWithPath: path)
self.init(contentsOfURL: url)
}
public init?(contentsOfURL url: URL) {
guard let data = try? Data(contentsOf: url),
let dictionary = (try? PropertyListSerialization.propertyList(from: data, options: [], format: nil) as? [String: Any]) ?? nil
else { return nil }
self = dictionary
}
}
你可以这样使用它:
let filePath = Bundle.main.path(forResource: "Preferences", ofType: "plist")!
let preferences = Dictionary(contentsOfFile: filePath)!
UserDefaults.standard.register(defaults: preferences)
Swift 4.0 iOS 11.2.6列表解析和代码解析它，基于https://stackoverflow.com/users/3647770/ashok-r上面的答案。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
<dict>
<key>identity</key>
<string>blah-1</string>
<key>major</key>
<string>1</string>
<key>minor</key>
<string>1</string>
<key>uuid</key>
<string>f45321</string>
<key>web</key>
<string>http://web</string>
</dict>
<dict>
<key>identity</key>
<string></string>
<key>major</key>
<string></string>
<key>minor</key>
<string></string>
<key>uuid</key>
<string></string>
<key>web</key>
<string></string>
</dict>
</array>
</plist>
do {
let plistXML = try Data(contentsOf: url)
var plistData: [[String: AnyObject]] = [[:]]
var propertyListFormat = PropertyListSerialization.PropertyListFormat.xml
do {
plistData = try PropertyListSerialization.propertyList(from: plistXML, options: .mutableContainersAndLeaves, format: &propertyListFormat) as! [[String:AnyObject]]
} catch {
print("Error reading plist: \(error), format: \(propertyListFormat)")
}
} catch {
print("error no upload")
}
如果你有信息。Plist，然后使用
Bundle.main.infoDictionary
