“打印”按钮如何打印8.5英寸x 11英寸的图像?Swift 3,IOS
我试图直接从我的应用程序打印-这是一个清单。唯一的问题是当我打印时,图像将只填充打印纸的1/4。我想让图像填满8.5英寸乘11英寸的整张纸 这是我的打印按钮:“打印”按钮如何打印8.5英寸x 11英寸的图像?Swift 3,IOS,ios,printing,swift3,uiprintinteractioncntrler,Ios,Printing,Swift3,Uiprintinteractioncntrler,我试图直接从我的应用程序打印-这是一个清单。唯一的问题是当我打印时,图像将只填充打印纸的1/4。我想让图像填满8.5英寸乘11英寸的整张纸 这是我的打印按钮: @IBAction func buttonAction2(_ sender: UIButton) { //Screenshot of view controller (minus status/Nav bar) let top: CGFloat = 46 let bottom: CGFloat = 0
@IBAction func buttonAction2(_ sender: UIButton) {
//Screenshot of view controller (minus status/Nav bar)
let top: CGFloat = 46
let bottom: CGFloat = 0
let size = CGSize(width: view.frame.size.width, height: view.frame.size.height - top - bottom)
UIGraphicsBeginImageContextWithOptions(size, false, 0)
let context = UIGraphicsGetCurrentContext()!
context.translateBy(x: 0, y: -top)
view.layer.render(in: context)
let snapshot = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
///Print screenshot
let printController = UIPrintInteractionController.shared
let printInfo = UIPrintInfo(dictionary:nil)
printInfo.jobName = "printing an image"
printInfo.outputType = .photo
printController.printInfo = printInfo
printController.printingItem = snapshot
printController.present(animated: true) { (_, isPrinted, error) in if error == nil {
if isPrinted {
print("image is printed")
}else{
print("image is not printed")
}
}
}
}
我可以将图像保存到我的相机胶卷中,然后从那里打印,而不是直接从我的应用程序打印,这样效果很好。当从“我的相机”卷打印时,图像将填充整个页面:
//Save photo to camera roll
UIImageWriteToSavedPhotosAlbum(snapshot!, nil, nil, nil)
不过,我真的需要从应用程序打印。有什么方法可以做到这一点吗?翻译后您是否尝试过缩放上下文
context.translateBy(x: 0, y: -top)
context.scaleBy(x: 2, y: 2)
我想出来了。我很傻 使用: 而不是:
printInfo.outputType = .photo
图像现在被切掉了75%(从它被放大),仍然只占页面的75%。
printInfo.outputType = .photo