Ios 用swift写文件

这是我在appDelegate didFinishLaunchingWithOptions（）中的代码

am获取的错误是无法将NSString转换为UnSafepointer。

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有人能帮我怎么实现吗？

只需从

日志文件路径中删除
NSString
：

var paths : NSArray =  NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
var documentsDirectory = paths.objectAtIndex(0)
var fileName: String = String(format: "Logger.txt")
var logFilePath = documentsDirectory.stringByAppendingPathComponent(fileName)
freopen(logFilePath, "a+", stderr)

更安全的方法是：

let file = "Logger.txt"
let text = "A safer way to do this"

if let directory : NSString = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true).first {
    let path = directory.stringByAppendingPathComponent(file);

    print(path)

    do {
        try text.writeToFile(path, atomically: false, encoding: NSUTF8StringEncoding)
    }
    catch {
    }
}

放开铸造；-）

您只需强制转换NSArray即可获得objectAtIndex（）方法

额外奖励：使用let而不是var

编辑：

不带NSArray和NSString的版本：

let paths =  NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentsDirectory = paths[0]
let fileName = String(format: "Logger.txt")
let logFilePath = NSURL(fileURLWithPath: documentsDirectory).URLByAppendingPathComponent(fileName).absoluteString
freopen(logFilePath, "a+", stderr)

let paths : NSArray =  NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentsDirectory = paths.objectAtIndex(0)
let fileName = String(format: "Logger.txt")
let logFilePath = documentsDirectory.stringByAppendingPathComponent(fileName)
freopen(logFilePath, "a+", stderr)

let paths =  NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentsDirectory = paths[0]
let fileName = String(format: "Logger.txt")
let logFilePath = NSURL(fileURLWithPath: documentsDirectory).URLByAppendingPathComponent(fileName).absoluteString
freopen(logFilePath, "a+", stderr)