ios - 使用 swift iOS 13.4 是否有类 CIVibrance 或字符串 "CIVibrance"或方法 CIFilter().vibrance()？

Question

快速查找 CIVibrance 类或字符串“CIVibrance”或 CIFilter().vibrance() 之类的方法。查看文档，有些文档在 swift 中似乎不可用，但 Xcode 中缺少其他文档。 (iOS 13.4 Xcode 11.5)

https://developer.apple.com/documentation/coreimage/cifilter/3228429-vibrance
https://developer.apple.com/documentation/coreimage/civibrance?language=occ

import UIKit
import CoreImage

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    func test() {
        let ciFilter = CIFilter()

        let ciVibrance = ciFilter.vibrance() // error
        let ciVibrance2 = CIFilter.vibrance() // error
        let ciVibrance3 = CIVibrance() // error
    }
}

Answer 1

您可以按 shift+command+o(字母“oh”)或选择"file"»“快速打开...”菜单，然后搜索方法或类名:



这通常会给你一个关于它可能在哪里的线索。在这种情况下:

import CoreImage.CIFilterBuiltins

例如:

import UIKit
import CoreImage.CIFilterBuiltins

class ViewController: UIViewController {
    @IBOutlet weak var imageView1: UIImageView!
    @IBOutlet weak var imageView2: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()

        imageView2.image = vibrantImage()
    }

    func vibrantImage() -> UIImage? {
        guard let input = UIImage(named: "flower.jpg")?.cgImage else {
            return nil
        }

        let filter = CIFilter.vibrance()
        filter.amount = 1
        filter.inputImage = CIImage(cgImage: input)
        return filter.outputImage.flatMap { UIImage(ciImage: $0) }
    }
}

产量:



(左边是 original image，右边是生动的演绎)