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我将2880 x 2560图像分成两个两个1440 x 2560图像。我一直试图使用CGImageForProposedRect
来做到这一点,但我不确定我是否正确接近它。以下是我迄今为止(对操场输出,代码附加在结尾):如何使用Swift为OSX分割图像
但如果你注意到,即使CGRects是1440x2560,leftImage
和rightImage
都没有。这不是如何CGImageForProposedRect
的作品?如果没有,为什么它需要一个CGRect参数?
import Cocoa
import AppKit
import CoreGraphics
let image = NSImage(named:"image")
if let image = image {
var imageRect:CGRect = CGRectMake(0, 0, image.size.width, image.size.height)
var imageRef = image.CGImageForProposedRect(&imageRect, context: nil, hints: nil)
var leftImageRect:CGRect = CGRectMake(0, 0, image.size.width/2.0, image.size.height)
var leftImageRef = image.CGImageForProposedRect(&leftImageRect, context: nil, hints: nil)
var leftImage = NSImage(CGImage:leftImageRef!.takeUnretainedValue(), size:NSZeroSize)
var rightImageRect:CGRect = CGRectMake(image.size.width/2.0, 0, image.size.width/2.0, image.size.height)
var rightImageRef = image.CGImageForProposedRect(&rightImageRect, context: nil, hints: nil)
var rightImage = NSImage(CGImage:rightImageRef!.takeUnretainedValue(), size:NSZeroSize)
}