Objective-C Requires Chilkat v11.7.0+

Replace PDF Text on Selected Pages Only

See more PDF Text Replacement Examples

Demonstrates the "pages" option, which limits the search for placeholders and labels to the given pages: "all" (the default), "first", "last", "odd", "even", or a list such as "1,3,5-9". The two-page order confirmation carries the same "Status:" label on both pages; the status is changed on page 2 only, then on both pages. Objective-C

#import <CkoPdf.h>
#import <CkoJsonObject.h>

BOOL success = NO;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  The PDF used in this example is available at order_confirmation.pdf

CkoPdf *pdf = [[CkoPdf alloc] init];
success = [pdf LoadFile: @"qa_data/pdf/order_confirmation.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
CkoJsonObject *jsonOut = [[CkoJsonObject alloc] init];

//  Both pages have "Status:   Pending".  With pages "2", only page 2 is searched.
[json UpdateString: @"pages" value: @"2"];
[json UpdateString: @"labels[0].label" value: @"Status:"];
[json UpdateString: @"labels[0].value" value: @"Shipped"];
success = [pdf TextReplace: @"check" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@%@",@"pages 2: found on page(s) ",[jsonOut StringOf: @"replacements[0].pages"]);

//  With every page searched, the default occurrence ("first") still replaces one -- the first in reading order.
[json UpdateString: @"pages" value: @"all"];
success = [pdf TextReplace: @"check" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@%@",@"pages all, first occurrence: found on page(s) ",[jsonOut StringOf: @"replacements[0].pages"]);

//  Every occurrence on every page.
[json UpdateString: @"labels[0].occurrence" value: @"all"];
success = [pdf TextReplace: @"apply" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

NSLog(@"%@%d%@%@",@"pages all, every occurrence: ",[[jsonOut IntOf: @"replacements[0].count"] intValue],@" replaced on page(s) ",[jsonOut StringOf: @"replacements[0].pages"]);

success = [pdf WriteFile: @"qa_output/order_shipped.pdf"];
if (success == NO) {
    NSLog(@"%@",pdf.LastErrorText);
    return;
}

//  Sample output:

//  pages 2: found on page(s) 2
//  pages all, first occurrence: found on page(s) 1
//  pages all, every occurrence: 2 replaced on page(s) 1,2