Ios 使用AirPrint打印UIView的内容会导致空页

我想用AirPrint打印机打印UIView的内容。UIView通过drawrect:消息以编程方式绘制，并显示在iPhone或iPad显示屏上。 打印的图像应适合默认页面，以便与iPhone或iPad上的图像不同。因此，我使用drawrect:forViewPrintFormatter:方法将UIView的内容输出到AirPrint打印机。 为此，我将UIPrintInteractionController与UIViewPrintFormatter和UIPrintPageRenderer结合使用

我尝试了以下选项，结果如下：

如果我使用UIPrintPageRenderer的自定义子类，我将获得：

• 如果我将numberOfPages设置为1，则为打印的空白页
• 如果我将numberOfPages设置为2，则所需图像将打印两次

如果在没有printPageRenderer的情况下使用UIPrintFormatter，则会获得所需的图像视图，然后打印一个空页面

如果有人能帮助我，我将不胜感激

以下是UIPrintPageRenderer子类中的代码：

@implementation AHLPrintPageRenderer

- (NSInteger)numberOfPages
{ 
    return 2
}

- (void) drawPrintFormatter:(UIPrintFormatter *)printFormatter forPageAtIndex:(NSInteger)pageIndex
{
    [printFormatter drawInRect:self.printableRect forPageAtIndex:0];
}

- (void) printDiagram
{
// Obtain the shared UIPrintInteractionController
UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
if(!controller){
    NSLog(@"Couldn't get shared UIPrintInteractionController!");
    return;
}
else
    [controller setDelegate:self];
// We need a completion handler block for printing.
UIPrintInteractionCompletionHandler completionHandler = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
    if(completed && error)
        NSLog(@"FAILED! due to error in domain %@ with error code %ld", error.domain, (long)error.code);
};
// Obtain a printInfo so that we can set our printing defaults.
UIPrintInfo *printInfo = [UIPrintInfo printInfo];
// This application produces General content that contains color.
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = @"printJob";
printInfo.duplex = UIPrintInfoDuplexLongEdge;
CGSize viewSize = printView.bounds.size;
if (viewSize.height > viewSize.width) {
    printInfo.orientation = UIPrintInfoOrientationPortrait;
}
else {
    printInfo.orientation = UIPrintInfoOrientationLandscape;
}
controller.printInfo = printInfo;
controller.showsPageRange = YES;
UIViewPrintFormatter *formatter = [printView viewPrintFormatter];

//
// The following three lines of code should be commented out if printing with the UIPrintFormatter only
//
AHLPrintPageRenderer *renderer = [[AHLPrintPageRenderer alloc] init];
[renderer addPrintFormatter:formatter startingAtPageAtIndex:0];
controller.printPageRenderer = renderer;
// ****
controller.printFormatter = formatter;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    [controller presentFromBarButtonItem:printButton animated:YES completionHandler:completionHandler];    // iPad
}
else {
    [controller presentAnimated:YES completionHandler:completionHandler];    // iPhone
}
}

打印UIView自定义子类的printView实例的代码：

@implementation AHLPrintPageRenderer

- (NSInteger)numberOfPages
{ 
    return 2
}

- (void) drawPrintFormatter:(UIPrintFormatter *)printFormatter forPageAtIndex:(NSInteger)pageIndex
{
    [printFormatter drawInRect:self.printableRect forPageAtIndex:0];
}

- (void) printDiagram
{
// Obtain the shared UIPrintInteractionController
UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
if(!controller){
    NSLog(@"Couldn't get shared UIPrintInteractionController!");
    return;
}
else
    [controller setDelegate:self];
// We need a completion handler block for printing.
UIPrintInteractionCompletionHandler completionHandler = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
    if(completed && error)
        NSLog(@"FAILED! due to error in domain %@ with error code %ld", error.domain, (long)error.code);
};
// Obtain a printInfo so that we can set our printing defaults.
UIPrintInfo *printInfo = [UIPrintInfo printInfo];
// This application produces General content that contains color.
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = @"printJob";
printInfo.duplex = UIPrintInfoDuplexLongEdge;
CGSize viewSize = printView.bounds.size;
if (viewSize.height > viewSize.width) {
    printInfo.orientation = UIPrintInfoOrientationPortrait;
}
else {
    printInfo.orientation = UIPrintInfoOrientationLandscape;
}
controller.printInfo = printInfo;
controller.showsPageRange = YES;
UIViewPrintFormatter *formatter = [printView viewPrintFormatter];

//
// The following three lines of code should be commented out if printing with the UIPrintFormatter only
//
AHLPrintPageRenderer *renderer = [[AHLPrintPageRenderer alloc] init];
[renderer addPrintFormatter:formatter startingAtPageAtIndex:0];
controller.printPageRenderer = renderer;
// ****
controller.printFormatter = formatter;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    [controller presentFromBarButtonItem:printButton animated:YES completionHandler:completionHandler];    // iPad
}
else {
    [controller presentAnimated:YES completionHandler:completionHandler];    // iPhone
}
}