当方向设置为横向时，UIPrintInteractionController会附加一个空白页面

Question

我正在尝试使用UIMarkupTextPrintFormatter将字符串发送到打印机，当我不更改页面方向时，一切都很正常 - 默认设置为纵向。

但是，当我将页面方向设置为横向时，会在渲染输出中附加一个空白页面，就好像边距超出第一页面一样。

这是我的打印代码：

let printController = UIPrintInteractionController.sharedPrintController()

let printInfo = UIPrintInfo(dictionary: nil)
printInfo.jobName = "Print Job"
printInfo.orientation = .Landscape
printController.printInfo = printInfo

let formatter = UIMarkupTextPrintFormatter(markupText: "Welcome")
formatter.contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
printController.printFormatter = formatter

printController.presentAnimated(true, completionHandler: nil)

另外需要注意的是，当页面设置为横向时，Xcode会记录一些与自动布局相关的错误。

the behavior of the UICollectionViewFlowLayout is not defined because:
the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.
The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x7fa066097850>, and it is attached to <UICollectionView: 0x7fa06687f800; frame = (0 0; 375 313.5); clipsToBounds = YES; opaque = NO; autoresize = W+H; gestureRecognizers = <NSArray: 0x7fa066095e90>; layer = <CALayer: 0x7fa066098b30>; contentOffset: {0, 0}; contentSize: {666, 313.5}> collection view layout: <UICollectionViewFlowLayout: 0x7fa066097850>.
Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.
the behavior of the UICollectionViewFlowLayout is not defined because:
the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.
The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x7fa066097850>, and it is attached to <UICollectionView: 0x7fa06687f800; frame = (0 0; 375 313.5); clipsToBounds = YES; opaque = NO; autoresize = W+H; gestureRecognizers = <NSArray: 0x7fa066095e90>; layer = <CALayer: 0x7fa066098b30>; contentOffset: {0, 0}; contentSize: {666, 313.5}> collection view layout: <UICollectionViewFlowLayout: 0x7fa066097850>.
Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.
Unbalanced calls to begin/end appearance transitions for <UIViewController: 0x7fa066085830>.
the behavior of the UICollectionViewFlowLayout is not defined because:
the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.
The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x7fa063c55130>, and it is attached to <UICollectionView: 0x7fa064043000; frame = (0 0; 375 313.5); clipsToBounds = YES; opaque = NO; autoresize = W+H; gestureRecognizers = <NSArray: 0x7fa063c4a720>; layer = <CALayer: 0x7fa063c26e60>; contentOffset: {0, 0}; contentSize: {666, 313.5}> collection view layout: <UICollectionViewFlowLayout: 0x7fa063c55130>.
Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.
the behavior of the UICollectionViewFlowLayout is not defined because:
the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values.
The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x7fa063c55130>, and it is attached to <UICollectionView: 0x7fa064043000; frame = (0 0; 375 313.5); clipsToBounds = YES; opaque = NO; autoresize = W+H; gestureRecognizers = <NSArray: 0x7fa063c4a720>; layer = <CALayer: 0x7fa063c26e60>; contentOffset: {0, 0}; contentSize: {666, 313.5}> collection view layout: <UICollectionViewFlowLayout: 0x7fa063c55130>.
Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes to catch this in the debugger.

我曾尝试仅打印第一页但找不到有关设置页面范围的任何内容，UIMarkupTextPrintFormatter可以设置startPage变量，但即使我设置它也没有运气将它设置为第二页，它呈现为没有设置为任何东西。

我可以通过删除空白页面或仅将打印范围设置为第1页来解决此问题，但到目前为止，我无法完成其中任何一项。有什么想法吗？

Answer 1

我似乎可以通过直接为printFormatter设置UIPrintInteractionController来创建UIPrintPageRenderer，然后将我的格式化程序附加到渲染器，然后再将其设置为{{}} {1}}。

以下是解决方案：

UIPrintInteractionController