iOS开发之目录文件管理

class ViewController: UIViewController {
    // MARK: - Properties
    lazy var documentsPath: String = {
        let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        return paths.first!
    }()
}

func directoryExistsAtPath(path: String) -> Bool {
        let fileManager = NSFileManager.defaultManager()
        let result = fileManager.fileExistsAtPath(path)
        
        if result {
            print("directory exists...")
        } else {
            print("directory not exists...")
        }
        
        return result
    }

func createDirectoryAtPath(path: String) {
        let fileManager = NSFileManager.defaultManager()
        do {
            try fileManager.createDirectoryAtPath(path,
                withIntermediateDirectories: false, attributes: nil)//path:目录路径，withIntermediateDirectories:告诉系统上级目录是否存在，true表示需要创建多级目录，attributes:文件夹相关属性
        } catch {
            print("create directory failed...")
        }
    }

func deleteDirectoryAtPath(path: String) {
        let fileManager = NSFileManager.defaultManager()
        do {
            try fileManager.removeItemAtPath(path)
        } catch {
            print("delete directory failed...")
        }
    }

func fileTest() {
        // ~/Documents/data.txt
        
        // 检查文件是否存在，如果不存在，则创建文件
        let path = "\(documentsPath)/data.txt"
        print(path)
        
        if !fileExistsAtPath(path) {
            createFileAtPath(path)
            fileExistsAtPath(path)
        }
        
        // 删除目录
        deleteFileAtPath(path)
        
        // 删除之后，再检查一次
        fileExistsAtPath(path)
    }
    
    func fileExistsAtPath(path: String) -> Bool {
        let fileManager = NSFileManager.defaultManager()
        let result = fileManager.fileExistsAtPath(path)
        
        if result {
            print("file exists...")
        } else {
            print("file not exists...")
        }
        
        return result
    }

func createFileAtPath(path: String) {
        let fileManager = NSFileManager.defaultManager()
        fileManager.createFileAtPath(path, contents: nil, attributes: nil)//path代表文件路径，contents代表想要写入文件的内容，attributes代表文件相关属性
    }

func deleteFileAtPath(path: String) {
        let fileManager = NSFileManager.defaultManager()
        do {
            try fileManager.removeItemAtPath(path)
        } catch {
            print("delete directory failed...")
        }
    }