Question

我可以创建PDF并将jpg图像添加到其中。问题是我只能以非常低的分辨率获得图像的一小部分。如何将iPad相机拍摄的照片放入PDF？任何帮助将不胜感激。

#import "MTViewController.h"
#define kPadding 20

@interface MTViewController ()
{
    CGSize _pageSize;
}
@end

@implementation MTViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}

 - (IBAction)didClickOpenPDF
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:@"NextPDF.pdf"];

    if([[NSFileManager defaultManager] fileExistsAtPath:pdfPath])
    {
        ReaderDocument *document = [ReaderDocument withDocumentFilePath:pdfPath password:nil];

        if (document != nil)
        {
            ReaderViewController *readerViewController = [[ReaderViewController alloc]                                  initWithReaderDocument:document];
            readerViewController.delegate = self;
            readerViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
            readerViewController.modalPresentationStyle = UIModalPresentationFullScreen;
            [self presentModalViewController:readerViewController animated:YES];
        }
    }
}

- (IBAction)didClickMakePDF
{
    [self setupPDFDocumentNamed:@"NextPDF" Width:1024 Height:768];
    [self beginPDFPage];
    UIImage *anImage = [UIImage imageNamed:@"Test_1.JPG"];
    CGRect imageRect = [self addImage:anImage
                  atPoint:CGPointMake((_pageSize.width/2)-(anImage.size.width/2), + kPadding)];
    [self beginPDFPage];
    [self finishPDF];
}
- (void)setupPDFDocumentNamed:(NSString*)name Width:(float)width Height:(float)height
{
    _pageSize = CGSizeMake(width, height);
    NSString *newPDFName = [NSString stringWithFormat:@"%@.pdf", name];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:newPDFName];
    UIGraphicsBeginPDFContextToFile(pdfPath, CGRectZero, nil);
}

- (void)beginPDFPage
{
    UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, _pageSize.width, _pageSize.height), nil);
}

- (void)finishPDF
{
    UIGraphicsEndPDFContext();
}

- (CGRect)addImage:(UIImage*)image atPoint:(CGPoint)point
{
    CGRect imageFrame = CGRectMake(point.x, point.y, image.size.width, image.size.height);
    [image drawInRect:imageFrame];
    return imageFrame;
}

- (void)dismissReaderViewController:(ReaderViewController *)viewController
{
    [self dismissModalViewControllerAnimated:YES];
}
@end

Answer 1

您在addImage:atPoint:方法中创建的框架完全错误。您需要创建一个实际适合页面的框架。

您的页面是1024x768（对于PDF来说这是一个奇怪的大小）。 PDF的大小应为密度为72点（每英寸点数）的点。

然后指定图像的原点应该是页面的中心。然后将图像的帧设置为图像的大小。完整图像将比PDF页面大小大得多。

如果您希望图片填满页面，请将图片的框架设置为0, 0, 1024, 768（根据需要调整您可能需要的任何边距）。然后将完整大小的图像绘制到该帧中。图像将缩放以适合。您可能还需要调整框架以使其具有与原始图像相同的纵横比，以避免图像失真。

如何使用IPAD相机拍摄的jpg图像创建PDF页面？

1 个答案: