swift - 我正在尝试快速制作 ImageProcessor 但出现错误

Question

import UIKit

let image = UIImage(named: "sample.png")

// Process the image!

var myRGBA = RGBAImage(image: image!)

let avgRed = 122
let avgGreen = 113
let avgBlue = 51

for y in 0..<myRGBA?.height {
    for x in 0..<myRGBA?.width {
        let index = y * (myRGBA?.width)! + x
        var pixel = myRGBA?.pixels[index]
        let redDiff = Int(pixel.red) - avgRed
        if (redDiff>0)
        {
            pixel.red = UInt8( max(0, min(255,avgRed + redDiff * 5)))
            myRGBA?.pixels[index] = pixel
        }
    }
}

let newImage2 = myRGBA?.toUIImage()

错误是说 -> 二元运算符“..<”不能应用于“Int”和“Int?”类型的操作数

RGBAImage 运行平稳，没有任何错误

我正在用 swift 3 编写代码

Answer 1

我想你只需要打开你的可选

import UIKit

let image = UIImage(named: "sample.png")

// Process the image!

var myRGBA = RGBAImage(image: image!)

let avgRed = 122
let avgGreen = 113
let avgBlue = 51
if let unwrapped = myRGBA?{
for y in 0..< unwrapped.height {
    for x in 0..< unwrapped.width {
        let index = y * (myRGBA?.width)! + x
        var pixel = myRGBA?.pixels[index]
        let redDiff = Int(pixel.red) - avgRed
        if (redDiff>0)
        {
            pixel.red = UInt8( max(0, min(255,avgRed + redDiff * 5)))
            myRGBA?.pixels[index] = pixel
        }
    }
}
}
let newImage2 = myRGBA?.toUIImage()