mediter

import Foundation

do {

    //要做一些操作

    let str = try NSString(contentsOfFile: filePath,encoding:   NSUTF8StringEncoding)//要尝试做的事情

} catch let err as NSError {//如果失败则进入catch代码块

mediter

// MARK: - Data Persistence
    func documentsDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory,
                                             in: .userDomainMask)
        return paths[0]
    }
    
    func dataFilePath() -> URL {
        return documentsDirectory().appendingPathComponent("Checklists.plist")
    }

mediter

tableView.backgroundColor = UIColor(red:1, green:1, blue:1, alpha:1.00)

let backgroundImageView = UIImageView(frame: view.bounds)
backgroundImageView.image = UIImage(named: "background")
backgroundImageView.alpha = 0.5

tableView.backgroundView = backgroundImageView

mediter

// get the height of the status bar
let statusBarHeight = UIApplication.shared.statusBarFrame.height