如何使用 Swift 2 和 Xcode 7 读取游乐场文本资源文件
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How to read a playground text resource files with Swift 2 and Xcode 7
提问by Jeremy Chone
Xcode 7 Playgrounds now supports loading files from the nestedResourcesdirectory.
Xcode 7 Playgrounds 现在支持从嵌套Resources目录加载文件。
I can get SKScene(fileNamed: "GameScene")when I have a GameScene.sksin my Resourcesor NSImage(named:"GameScene.png")if I have a GameScene.pngin your Resources.
我可以SKScene(fileNamed: "GameScene")当我有一个GameScene.sks在我的Resources或者NSImage(named:"GameScene.png")如果我有一个GameScene.png在你的Resources。
But how can I read a regular text file from the Playground Resourcesdirectory as well?
但是我怎样才能从 PlaygroundResources目录中读取一个普通的文本文件呢？
回答by Jeremy Chone
We can use the Bundle.main
我们可以使用 Bundle.main
So, if you have a test.json in your playground like
所以，如果你在你的操场上有一个 test.json 像
You can access it and print its content like that:
您可以像这样访问它并打印其内容：
// get the file path for the file "test.json" in the playground bundle
let filePath = Bundle.main.path(forResource:"test", ofType: "json")
// get the contentData
let contentData = FileManager.default.contents(atPath: filePath!)
// get the string
let content = String(data:contentData!, encoding:String.Encoding.utf8)
// print
print("filepath: \(filePath!)")
if let c = content {
print("content: \n\(c)")
}
Will print
会打印
filepath: /var/folders/dm/zg6yp6yj7f58khhtmt8ttfq00000gn/T/com.apple.dt.Xcode.pg/applications/Json-7800-6.app/Contents/Resources/test.json
content:
{
"name":"jc",
"company": {
"name": "Netscape",
"city": "Mountain View"
}
}
回答by leanne
Jeremy Chone'sanswer, updated for Swift 3, Xcode 8:
Jeremy Chone 的回答，针对 Swift 3、Xcode 8 进行了更新：
// get the file path for the file "test.json" in the playground bundle
let filePath = Bundle.main.path(forResource: "test", ofType: "json")
// get the contentData
let contentData = FileManager.default.contents(atPath: filePath!)
// get the string
let content = String(data: contentData!, encoding: .utf8)
// print
print("filepath: \(filePath!)")
if let c = content {
print("content: \n\(c)")
}
回答by Damiaan Dufaux
You can use String directly with a URL. Example in Swift 3:
您可以直接将 String 与 URL 一起使用。Swift 3 中的示例：
let url = Bundle.main.url(forResource: "test", withExtension: "json")!
let text = String(contentsOf: url)
回答by Yoav Aharoni
Another short way (Swift 3):
另一个捷径（Swift 3）：
let filePath = Bundle.main.path(forResource: "test", ofType: "json")
let content: String = String(contentsOfFile: filePath!, encoding: .utf8)
回答by user8416808
Added try for swift3.1:
为 swift3.1 添加尝试：
let url = Bundle.main.url(forResource: "test", withExtension: "json")!
// let text = String(contentsOf: url)
do {
let text = try String(contentsOf: url)
print("text: \n\(text)")
}
catch _ {
// Error handling
}
// --------------------------------------------------------------------
let filePath2 = Bundle.main.path(forResource: "test", ofType: "json")
do {
let content2: String = try String(contentsOfFile: filePath2!, encoding: .utf8)
print("content2: \n\(content2)")
}
catch _ {
// Error handling
}
回答by skymook
Swift 5
斯威夫特 5
It is possible to get to files in your Resourcesfolder by the bundle in a Playground.
可以Resources通过 Playground 中的捆绑包访问文件夹中的文件。
import UIKit
Here are two ways to get the JSON data.
这里有两种获取 JSON 数据的方法。
Path:
小路：
guard let path = Bundle.main.path(forResource:"test", ofType: "json"),
let data = FileManager.default.contents(atPath: path) else {
fatalError("Can not get json data")
}
URL:
网址：
guard let url = Bundle.main.url(forResource:"test", withExtension: "json") else {
fatalError("Can not get json file")
}
if let data = try? Data(contentsOf: url) {
// do something with data
}
