Swift 如何在alpha==0的UIImage中设置像素
我需要得到`像素,其中alpha==0Swift 如何在alpha==0的UIImage中设置像素,swift,uiimage,core-graphics,Swift,Uiimage,Core Graphics,我需要得到`像素,其中alpha==0 let width = Int(img.size.width) let height = Int(img.size.height) let bitmapBytesPerRow = width let bitmapByteCount = bitmapBytesPerRow * height let pixelData = UnsafeMutablePointer<UInt8>.allocate(capacity: bitmapByt
let width = Int(img.size.width)
let height = Int(img.size.height)
let bitmapBytesPerRow = width
let bitmapByteCount = bitmapBytesPerRow * height
let pixelData = UnsafeMutablePointer<UInt8>.allocate(capacity: bitmapByteCount)
let width=Int(img.size.width)
let height=Int(img.size.height)
让bitmapBytesPerRow=宽度
设bitmapByteCount=bitmapBytesPerRow*高度
让pixelData=Unsafemeutablepointer.allocate(容量:bitmapByteCount)
欢迎来到StackOverflow!你为什么要这个?你能用alpha创建一个吗?是否有理由使用Unsafemtablepointer而不是列表?是的,我可以使用Unsafemtablepointer如何获得alfa==0的所有像素?这是另一个问题,请更新它。我将更新它?这个问题的解决办法是什么