在iOS上写入文件

Question

如何在iOS上写入文件？我正在尝试使用下面的代码来做，但是我做错了什么：char *saves = "abcd";NSData *data = [[NSData alloc] initWithBytes:saves length:4]; NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentsDirectory = [paths objectAtIndex:0];NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"MyFile"];[data writeToFile:appFile atomically:YES];我在资源上创建了MyFile.txt。

Answer 1

您的代码正在我的末端运行，我已经对其进行了测试。您在哪里查看更改？使用文档目录路径。获取路径-

NSLog(@"%@",documentsDirectory);

并从控制台复制路径，然后打开finder并按Cmd + shift + g并在此处粘贴路径，然后打开文件

Answer 2

迅速

func saveFile() {

    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)

    let documentsDirectory = paths[0] as! String

    let fileName = "\(documentsDirectory)/textFile.txt"

    let content = "Hello World"

    content.writeToFile(fileName, atomically: false, encoding: NSUTF8StringEncoding, error: nil)

}

func loadFile() {

    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)

    let documentsDirectory = paths[0] as! String

    let fileName = "\(documentsDirectory)/textFile.txt"

    let content: String = String(contentsOfFile: fileName, encoding: NSUTF8StringEncoding, error: nil)!

    println(content)

}

迅捷2

func saveFile() {

    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)

    let documentsDirectory = paths[0]

    let fileName = "\(documentsDirectory)/textFile.txt"

    let content = "Hello World"

    do{

        try content.writeToFile(fileName, atomically: false, encoding: NSUTF8StringEncoding)

    }catch _ {

    }

}

func loadFile()->String {

    let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)

    let documentsDirectory = paths[0] 

    let fileName = "\(documentsDirectory)/textFile.txt"

    let content: String

    do{

       content = try String(contentsOfFile: fileName, encoding: NSUTF8StringEncoding)

    }catch _{

        content=""

    }

    return content;

}

迅捷3

func saveFile() {

    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)

    let documentsDirectory = paths[0]

    let fileName = "\(documentsDirectory)/textFile.txt"

    let content = "Hello World"

    do{

        try content.write(toFile: fileName, atomically: false, encoding: String.Encoding.utf8)

    }catch _ {

    }

}

func loadFile()->String {

    let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)

    let documentsDirectory = paths[0]

    let fileName = "\(documentsDirectory)/textFile.txt"

    let content: String

    do{

        content = try String(contentsOfFile: fileName, encoding: String.Encoding.utf8)

    } catch _{

        content=""

    }

    return content;

}