2018-01-30

Swift xcode9.1 初见

@IBOutlet weak var picker: UIPickerView!

 let beauties = ["范冰冰","李冰冰","王菲","杨幂","周迅"]

picker.delegate = self as UIPickerViewDelegate 

 picker.dataSource = self

//页面跳转的方法（xib）

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        if segue.identifier == "GoToGallery" {

            let index = picker.selectedRow(inComponent: 0)

            var imageName: String?

            switch index{

            case 0:

                imageName = "fanbingbing"

            case 1:

                imageName = "libingbing"

            case 2:

                imageName = "wangfei"

            case 3:

                imageName = "yangmi"

            case 4:

                imageName = "zhouxu"

            default:

                imageName = nil

            }

            let vc = segue.destination as! GalleryViewController

            vc.imageName = imageName 

        }

    //页面返回

  @IBAction func close(segue: UIStoryboardSegue) {

    }

}

新建文件viewcontrollerextension（）

extension ViewController : UIPickerViewDataSource{

    func numberOfComponents(in pickerView: UIPickerView) -> Int {

        return 1

    }   

    public func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{        return beauties.count

    }

}

extension ViewController : UIPickerViewDelegate{

    public func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?{

        return beauties[row]

    }

}