Watermarks

Foxit PDF SDK for iOS provides watermark APIs via Core SDK for text, image, and page watermarks as page content or annotations.

Core classes

Class	Description
FSWatermark	Watermark from text, bitmap, image, or PDF page
FSWatermarkSettings	Position, offset, scale, rotation, opacity, flags
FSWatermarkTextProperties	Text font, size, color, style, line spacing, alignment

Create watermarks

Constructor	Source
initWithDocument:doc text:...	Text
initWithDocument:doc bitmap:...	Bitmap
initWithDocument:doc image:...	Image
initWithDocument:doc page:...	PDF page

// Text watermark
[[FSWatermark alloc] initWithDocument:doc text:@"CONFIDENTIAL"
    properties:textProps settings:settings]

// Bitmap watermark
[[FSWatermark alloc] initWithDocument:doc bitmap:bitmap settings:settings]

// Image watermark
[[FSWatermark alloc] initWithDocument:doc image:image frame_index:0 settings:settings]

// Page watermark
[[FSWatermark alloc] initWithDocument:doc page:sourcePage settings:settings]

Flag constants

Constant	Description
FSWatermarkSettingsFlagASPageContents	Insert as page content
FSWatermarkSettingsFlagASAnnot	Insert as annotation
FSWatermarkSettingsFlagOnTop	Above page content
FSWatermarkSettingsFlagNoPrint	Non-printable
FSWatermarkSettingsFlagInvisible	Invisible
FSWatermarkSettingsFlagShareImageStream	Share image stream across pages
FSWatermarkSettingsFlagShareTextStream	Share text stream across pages
FSWatermarkSettingsFlagSharePageStream	Share page stream across pages

Example: text watermark

#import <FoxitRDK/FSPDFObjC.h>

FSPDFDoc *doc = [[FSPDFDoc alloc] initWithPath:@"path/to/Sample.pdf"];
[doc load:nil];

FSWatermarkSettings *settings = [[FSWatermarkSettings alloc] init];
[settings setPosition:FSPosCenter];
[settings setOffset_x:0];
[settings setOffset_y:0];
[settings setFlags:FSWatermarkSettingsFlagASPageContents | FSWatermarkSettingsFlagOnTop];
[settings setScale_x:1.0f];
[settings setScale_y:1.0f];
[settings setRotation:-45.0f];
[settings setOpacity:50];

FSWatermarkTextProperties *textProps = [[FSWatermarkTextProperties alloc] init];
[textProps setFont:[[FSFont alloc] initWithStandard_id:FSFontStdIDCourier]];
[textProps setFont_size:48.0f];
[textProps setColor:0xFF0000];
[textProps setFont_style:FSWatermarkTextPropertiesFontStyleNormal];
[textProps setLine_space:1];
[textProps setAlignment:FSAlignmentCenter];

FSWatermark *watermark = [[FSWatermark alloc] initWithDocument:doc
                                                          text:@"CONFIDENTIAL"
                                                    properties:textProps
                                                      settings:settings];
[watermark insertToPage:[doc getPage:0]];

[doc saveAs:@"path/to/output.pdf" saveFlags:FSPDFDocSaveFlagNormal];

API reference

See the API reference for FSWatermark, FSWatermarkSettings, and FSWatermarkTextProperties.