Tạo nhiều trang PDF trong mục tiêu-c

Question

Tôi đang cố gắng tạo một tệp PDF nhiều trang. Tôi đã theo dõi số tutorial này. Điều này đang làm việc với tệp XIB cho văn bản tĩnh và sau đó thêm bảng từ mã. Nhưng vấn đề tôi gặp phải là khi bảng lớn hơn một trang. Khi bảng có nhiều hơn 9 hàng. Nó sẽ tiếp tục trên trang tiếp theo.

Đây là những gì tôi đang làm trong mã.

+(void)drawPDF:(NSString*)fileName 
{ 
    NSMutableDictionary *mutDictValues = [[[NSUserDefaults standardUserDefaults] objectForKey:@"dicValues"] mutableCopy]; 
    NSMutableArray *arrSelectedCities = [[mutDictValues objectForKey:@"cities"]mutableCopy ]; 

    if(arrSelectedCities.count <= 8){ 
     // If there are only 8 rows --> we can fit everyting on one page ! 

     // Create the PDF context using the default page size of 612 x 792. 
     UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil); 
     // Mark the beginning of a new page. 
     UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil); 

     [self drawLabels]; 
     [self drawLogo]; 

     int xOrigin = 50; 
     int yOrigin = 350; 

     int rowHeight = 50; 
     int columnWidth = 240; 

     int numberOfRows = 9; 
     int numberOfColumns = 2; 

     [self drawTableAt:CGPointMake(xOrigin, yOrigin) withRowHeight:rowHeight andColumnWidth:columnWidth andRowCount:numberOfRows andColumnCount:numberOfColumns]; 

     [self drawTableDataAt:CGPointMake(xOrigin, yOrigin) withRowHeight:rowHeight andColumnWidth:columnWidth andRowCount:numberOfRows andColumnCount:numberOfColumns withArray:arrSelectedCities]; 

     // Close the PDF context and write the contents out. 
     UIGraphicsEndPDFContext(); 

    }else{ 
     // When we have more then 8 rows we should have 2 pages. 
     NSLog(@"Create 2 pages"); 
     // Create the PDF context using the default page size of 612 x 792. 
     UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil); 
     // Mark the beginning of a new page. 
     UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil); 

     [self drawLabels]; 
     [self drawLogo]; 

     int xOrigin = 50; 
     int yOrigin = 350; 

     int rowHeight = 50; 
     int columnWidth = 240; 

     int numberOfRows = 9; 
     int numberOfColumns = 2; 

     [self drawTableAt:CGPointMake(xOrigin, yOrigin) withRowHeight:rowHeight andColumnWidth:columnWidth andRowCount:numberOfRows andColumnCount:numberOfColumns]; 

     [self drawTableDataAt:CGPointMake(xOrigin, yOrigin) withRowHeight:rowHeight andColumnWidth:columnWidth andRowCount:numberOfRows andColumnCount:numberOfColumns withArray:arrSelectedCities]; 


     // Create the PDF context using the default page size of 612 x 792. 
     UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil); 
     // Mark the beginning of a new page. 
     UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, 612, 792), nil); 


     int xOrigin2 = 50; 
     int yOrigin2 = 60; 
     int numberOfRows2 = ((arrSelectedCities.count+1)-9); 

     [self drawTableAt:CGPointMake(xOrigin2, yOrigin2) withRowHeight:rowHeight andColumnWidth:columnWidth andRowCount:numberOfRows2 andColumnCount:numberOfColumns]; 

     [self drawTableDataAt:CGPointMake(xOrigin2, yOrigin2) withRowHeight:rowHeight andColumnWidth:columnWidth andRowCount:numberOfRows2 andColumnCount:numberOfColumns withArray:arrSelectedCities]; 


    } 
    // Close the PDF context and write the contents out. 
    UIGraphicsEndPDFContext(); 
} 

Hãy để tôi giải thích những gì tôi đang làm ở đây. Tôi có một mảng mà nên điền vào tableview của tôi. Nếu mảng lớn hơn 8 thì tôi nên sử dụng 2 trang. Khác mọi thứ hoạt động với một trang.

Điều này có nghĩa là nó chỉ tạo trang thứ hai ....

Ai cũng có thể giúp tôi?

Answer 1

Bạn không nên gọi UIGraphicsBeginPDFContextToFile() một lần nữa khi tạo trang thứ hai, chỉ UIGraphicsBeginPDFPageWithInfo():

UIGraphicsBeginPDFContextToFile(...); 
UIGraphicsBeginPDFPageWithInfo(...); // start first page 
// ... 
UIGraphicsBeginPDFPageWithInfo(...); // start second page 
// ... 
UIGraphicsEndPDFContext(); 

Answer 2

Bạn không cần phải tạo ra bối cảnh cho trang thứ hai (UIGraphicsBeginPDFContextToFile(fileName, CGRectZero, nil)), bạn phải chỉ tạo ra trang này. Bạn cũng nên nhớ về việc đóng trang đã mở bằng cách sử dụng CGPDFContextEndPage().

Answer 3

NSArray *imageArray = [NSArray arrayWithObjects:[UIImage imageNamed:@"3.png"], [UIImage imageNamed:@"4.png"], [UIImage imageNamed:@"5.png"], [UIImage imageNamed:@"3.png"], nil]; 



NSMutableData *pdfFile = [[NSMutableData alloc] init]; 
double pageWidth = 0.0; 
double pageHeight = 0.0; 
UIImage *image; 
for (int i = 0; i < [imageArray count]; i++) 
{ 
    image =[UIImage imageWithCGImage:[imageArray[i] CGImage]]; 
    pageWidth = pageWidth + image.size.width ; 
    pageHeight = pageHeight + image.size.height; 
} 
image =[UIImage imageWithCGImage:[imageArray[0] CGImage]]; 
CGRect rect; 
rect = CGRectMake(0, 0,image.size.width ,image.size.height); 
UIGraphicsBeginPDFContextToData(pdfFile, CGRectZero, nil); 
for (int i = 0; i < [imageArray count] ; i++) 
{ 
    UIGraphicsBeginPDFPageWithInfo(rect, nil); 
    UIImage *contextImage = imageArray[i]; 
    [contextImage drawInRect:rect]; 
} 
UIGraphicsEndPDFContext(); 

// save PDF file 
NSString *saveFileName = [NSString stringWithFormat:@"%@%fx%f.pdf", @"test", pageWidth, pageHeight]; 

NSArray* documentDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES); 

NSString* documentDirectory = [documentDirectories objectAtIndex:0]; 
NSString* savePath = [documentDirectory stringByAppendingPathComponent:saveFileName]; 

if([[NSFileManager defaultManager] fileExistsAtPath:savePath]) 
{ 
    [[NSFileManager defaultManager] removeItemAtPath:savePath error:nil]; 
} 
[pdfFile writeToFile: savePath atomically: YES]; 
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"PDF File created and saved successfully." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil]; 
[alert show]; 

Answer 4

- (void)viewDidLoad { 
[super viewDidLoad]; 
[self createPDF]; 
} 

- (void)createPDF { 
[self setupPDFDocumentNamed:@"myPdf" Width:850 Height:1100]; 
[self beginPDFPage]; 
    } 

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

// kPadding will make 20 points margin on both sides of pdf 
CGRect textRect = [self addText:@"Line Text Testing" withFrame:CGRectMake(PdfPadding, PdfPadding, 400, 200) fontSize:48.0f]; 

textRect = [self addLineWithFrame:CGRectMake(PdfPadding, textRect.origin.y + textRect.size.height +PdfPadding, pageSize.width - PdfPadding*2, 4) withColor:[UIColor blueColor]]; 

UIImage *anImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://www.phantompeer.com/sitefiles/osx.png"]]]; 
textRect = [self addImage:anImage atPoint:CGPointMake((pageSize.width/2)-(anImage.size.width/2),textRect.origin.y + textRect.size.height + PdfPadding)]; 
textRect = [self addLineWithFrame:CGRectMake(PdfPadding, textRect.origin.y + textRect.size.height + PdfPadding, pageSize.width - PdfPadding*2, 4) withColor:[UIColor redColor]]; 

textRect = [self addText:@"Line Text Testing" withFrame:CGRectMake(PdfPadding, textRect.origin.y + textRect.size.height + PdfPadding, 400, 200) fontSize:48.0f]; 

textRect = [self addLineWithFrame:CGRectMake(PdfPadding, textRect.origin.y + textRect.size.height +PdfPadding, pageSize.width - PdfPadding*2, 4) withColor:[UIColor blueColor]]; 

anImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"https://www.w3schools.com/css/img_fjords.jpg"]]]; 
    textRect = [self addImage:anImage atPoint:CGPointMake((pageSize.width/2)-(anImage.size.width/2),textRect.origin.y + textRect.size.height + PdfPadding)]; 

textRect = [self addLineWithFrame:CGRectMake(PdfPadding, textRect.origin.y + textRect.size.height + PdfPadding, pageSize.width - PdfPadding*2, 4) withColor:[UIColor redColor]]; 


UIGraphicsEndPDFContext(); 
[self loadRemotePdf]; 
    } 
-(CGRect)addText:(NSString*)text withFrame:(CGRect)frame fontSize:(float)fontSize { 



UIFont *font = [UIFont systemFontOfSize:fontSize]; 
CGSize stringSize = [text sizeWithFont:font constrainedToSize:CGSizeMake(pageSize.width - 2*20-2*20, pageSize.height - 2*20 - 2*20) lineBreakMode:UILineBreakModeWordWrap]; 



if((frame.origin.y + stringSize.height + PdfPadding) > pageSize.height) { 
    frame = CGRectMake(frame.origin.x, PdfPadding, frame.size.width, frame.size.height); 
    UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil); 
} 

float textWidth = frame.size.width; 

if (textWidth < stringSize.width) 
    textWidth = stringSize.width; 
if (textWidth > pageSize.width) 
    textWidth = pageSize.width - frame.origin.x; 


CGRect renderingRect = CGRectMake(frame.origin.x, frame.origin.y, textWidth, stringSize.height); 

[text drawInRect:renderingRect withFont:font lineBreakMode:NSLineBreakByWordWrapping alignment:NSTextAlignmentLeft]; 

frame = CGRectMake(frame.origin.x, frame.origin.y, textWidth, stringSize.height); 

return frame; 
} 

-(CGRect)addLineWithFrame:(CGRect)frame withColor:(UIColor*)color { 


if((frame.origin.y + frame.size.height+PdfPadding) > pageSize.height) { 
    frame = CGRectMake(frame.origin.x, PdfPadding, frame.size.width, frame.size.height); 
    UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil); 
} 

CGContextRef currentContext = UIGraphicsGetCurrentContext(); 
CGContextSetStrokeColorWithColor(currentContext, color.CGColor); 

// this is the thickness of the line 
CGContextSetLineWidth(currentContext, frame.size.height); 
CGPoint startPoint = frame.origin; 
CGPoint endPoint = CGPointMake(frame.origin.x + frame.size.width, frame.origin.y); 

CGContextBeginPath(currentContext); 
CGContextMoveToPoint(currentContext, startPoint.x, startPoint.y); 
CGContextAddLineToPoint(currentContext, endPoint.x, endPoint.y); 

CGContextClosePath(currentContext); 
CGContextDrawPath(currentContext, kCGPathFillStroke); 



return frame; 
     } 


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

if((imageFrame.origin.y + imageFrame.size.height + PdfPadding) > pageSize.height) { 
    imageFrame = CGRectMake(imageFrame.origin.x, PdfPadding, imageFrame.size.width, imageFrame.size.height); 
    UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil); 
} 
[image drawInRect:imageFrame]; 
return imageFrame; 
} 

- (void) loadRemotePdf 
{ 
CGRect rect = [[UIScreen mainScreen] bounds]; 
CGSize screenSize = rect.size; 


NSString *newPDFName = [NSString stringWithFormat:@"myPdf.pdf"]; 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 

NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:newPDFName]; 

UIWebView *myWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0,0,screenSize.width,screenSize.height)]; 
myWebView.autoresizesSubviews = YES; 
myWebView.autoresizingMask=(UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth); 

NSURL *myUrl = [NSURL fileURLWithPath:pdfPath]; 
NSURLRequest *myRequest = [NSURLRequest requestWithURL:myUrl]; 

[myWebView loadRequest:myRequest]; 

[self.view addSubview: myWebView]; 
} 

Đối với việc tạo ra trang mới trong pdf, sử dụng

UIGraphicsBeginPDFPageWithInfo(CGRectMake(0, 0, pageSize.width, pageSize.height), nil);