我在GitHub上下载了BNHtmlPdfKit的分叉副本，它在PDF文件上添加了对页眉和页脚的支持。问题是，当我尝试使用以下代码将带有图像的子视图添加到页眉和页脚时，它只显示页眉和页脚上的空白区域：
- (void)drawHeaderForPageAtIndex:(NSInteger)pageIndex
inRect:(CGRect)headerRect
{
if (self.headerView != nil) {
[self.headerView setTintColor:[UIColor whiteColor]];
UIImage *img = [self imageWithView:self.headerView];
[img drawInRect:headerRect];
UIImageView *headerImage =[[UIImageView alloc] initWithFrame:CGRectMake(50,50,500,500)];
headerImage.image=[UIImage imageNamed:@"image.png"];
[self.headerView addSubview:headerImage];
}
}
请参阅下面的完整代码......
//
// BNHtmlPdfKit.m
//
// Created by Brent Nycum.
// Copyright (c) 2013 Brent Nycum. All rights reserved.
//
#import "BNHtmlPdfKit.h"
#define PPI 72
#define BNSizeMakeWithPPI(width, height) CGSizeMake(width * PPI, height * PPI)
#pragma mark - BNHtmlPdfKitPageRenderer Interface
@interface BNHtmlPdfKitPageRenderer : UIPrintPageRenderer
@property (nonatomic, assign) CGFloat topAndBottomMarginSize;
@property (nonatomic, assign) CGFloat leftAndRightMarginSize;
@property (nonatomic, strong) UIView *headerView;
@property (nonatomic, strong) UIView *footerView;
@end
#pragma mark - BNHtmlPdfKitPageRenderer Implementation
@implementation BNHtmlPdfKitPageRenderer
- (CGRect)paperRect {
return UIGraphicsGetPDFContextBounds();
}
- (CGRect)printableRect {
return CGRectInset([self paperRect], self.leftAndRightMarginSize, self.topAndBottomMarginSize);
}
- (void)drawHeaderForPageAtIndex:(NSInteger)pageIndex
inRect:(CGRect)headerRect
{
if (self.headerView != nil) {
[self.headerView setBackgroundColor:[UIColor whiteColor]];
UIImage *img = [self imageWithView:self.headerView];
UIImageView *headerImage =[[UIImageView alloc] initWithFrame:CGRectMake(50,50,500,500)];
headerImage.image=[UIImage imageNamed:@"image.png"];
[self.headerView addSubview:headerImage];
[img drawInRect:headerRect];
}
}
- (void)drawFooterForPageAtIndex:(NSInteger)pageIndex
inRect:(CGRect)footerRect
{
if (self.footerView != nil) {
[self.footerView setBackgroundColor:[UIColor whiteColor]];
UIImage *img = [self imageWithView:self.footerView];
[img drawInRect:footerRect];
}
}
- (UIImage *)imageWithView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
@end
#pragma mark - BNHtmlPdfKit Extension
@interface BNHtmlPdfKit () <UIWebViewDelegate>
- (CGSize)_sizeFromPageSize:(BNPageSize)pageSize;
- (void)_timeout;
- (void)_savePdf;
@property (nonatomic, copy) NSString *outputFile;
@property (nonatomic, strong) UIWebView *webView;
@property (nonatomic, copy) void (^dataCompletionBlock)(NSData *pdfData);
@property (nonatomic, copy) void (^fileCompletionBlock)(NSString *pdfFileName);
@property (nonatomic, copy) void (^failureBlock)(NSError * error);
@end
#pragma mark - BNHtmlPdfKit Implementation
@implementation BNHtmlPdfKit
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url success:(void (^)(NSData *pdfData))completion failure:(void (^)(NSError *error))failure {
return [BNHtmlPdfKit saveUrlAsPdf:url pageSize:[BNHtmlPdfKit defaultPageSize] isLandscape:NO success:completion failure:failure];
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url pageSize:(BNPageSize)pageSize success:(void (^)(NSData *pdfData))completion failure:(void (^)(NSError *error))failure {
return [BNHtmlPdfKit saveUrlAsPdf:url pageSize:pageSize isLandscape:NO success:completion failure:failure];
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url pageSize:(BNPageSize)pageSize isLandscape:(BOOL)landscape success:(void (^)(NSData *pdfData))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithPageSize:pageSize isLandscape:landscape];
pdfKit.dataCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:nil];
return pdfKit;
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url pageSize:(BNPageSize)pageSize isLandscape:(BOOL)landscape topAndBottomMarginSize:(CGFloat)topAndBottom leftAndRightMarginSize:(CGFloat)leftAndRight success:(void (^)(NSData *pdfData))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithPageSize:pageSize isLandscape:landscape];
pdfKit.topAndBottomMarginSize = topAndBottom;
pdfKit.leftAndRightMarginSize = leftAndRight;
pdfKit.dataCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:nil];
return pdfKit;
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url toFile:(NSString *)filename success:(void (^)(NSString *filename))completion failure:(void (^)(NSError *error))failure {
return [BNHtmlPdfKit saveUrlAsPdf:url toFile:filename pageSize:[BNHtmlPdfKit defaultPageSize] isLandscape:NO success:completion failure:failure];
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url toFile:(NSString *)filename pageSize:(BNPageSize)pageSize success:(void (^)(NSString *filename))completion failure:(void (^)(NSError *error))failure {
return [BNHtmlPdfKit saveUrlAsPdf:url toFile:filename pageSize:pageSize isLandscape:NO success:completion failure:failure];
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url toFile:(NSString *)filename pageSize:(BNPageSize)pageSize isLandscape:(BOOL)landscape success:(void (^)(NSString *filename))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithPageSize:pageSize isLandscape:landscape];
pdfKit.fileCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:filename];
return pdfKit;
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url toFile:(NSString *)filename pageSize:(BNPageSize)pageSize isLandscape:(BOOL)landscape topAndBottomMarginSize:(CGFloat)topAndBottom leftAndRightMarginSize:(CGFloat)leftAndRight success:(void (^)(NSString *filename))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithPageSize:pageSize isLandscape:landscape];
pdfKit.topAndBottomMarginSize = topAndBottom;
pdfKit.leftAndRightMarginSize = leftAndRight;
pdfKit.fileCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:filename];
return pdfKit;
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url customPageSize:(CGSize)pageSize success:(void (^)(NSData *pdfData))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithCustomPageSize:pageSize];
pdfKit.dataCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:nil];
return pdfKit;
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url customPageSize:(CGSize)pageSize topAndBottomMarginSize:(CGFloat)topAndBottom leftAndRightMarginSize:(CGFloat)leftAndRight success:(void (^)(NSData *pdfData))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithCustomPageSize:pageSize];
pdfKit.topAndBottomMarginSize = topAndBottom;
pdfKit.leftAndRightMarginSize = leftAndRight;
pdfKit.dataCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:nil];
return pdfKit;
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url toFile:(NSString *)filename customPageSize:(CGSize)pageSize success:(void (^)(NSString *filename))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithCustomPageSize:pageSize];
pdfKit.fileCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:filename];
return pdfKit;
}
+ (BNHtmlPdfKit *)saveUrlAsPdf:(NSURL *)url toFile:(NSString *)filename customPageSize:(CGSize)pageSize topAndBottomMarginSize:(CGFloat)topAndBottom leftAndRightMarginSize:(CGFloat)leftAndRight success:(void (^)(NSString *filename))completion failure:(void (^)(NSError *error))failure {
BNHtmlPdfKit *pdfKit = [[BNHtmlPdfKit alloc] initWithCustomPageSize:pageSize];
pdfKit.topAndBottomMarginSize = topAndBottom;
pdfKit.leftAndRightMarginSize = leftAndRight;
pdfKit.fileCompletionBlock = completion;
pdfKit.failureBlock = failure;
[pdfKit saveUrlAsPdf:url toFile:filename];
return pdfKit;
}
#pragma mark - Initializers
- (id)init {
if (self = [super init]) {
self.pageSize = [BNHtmlPdfKit defaultPageSize];
self.landscape = NO;
// Default 1/4" margins
self.topAndBottomMarginSize = 0.25f * 72.0f;
self.leftAndRightMarginSize = 0.25f * 72.0f;
}
return self;
}
- (id)initWithPageSize:(BNPageSize)pageSize {
if (self = [super init]) {
self.pageSize = pageSize;
self.landscape = NO;
// Default 1/4" margins
self.topAndBottomMarginSize = 0.25f * 72.0f;
self.leftAndRightMarginSize = 0.25f * 72.0f;
}
return self;
}
- (id)initWithPageSize:(BNPageSize)pageSize isLandscape:(BOOL)landscape {
if (self = [super init]) {
self.pageSize = pageSize;
self.landscape = landscape;
// Default 1/4" margins
self.topAndBottomMarginSize = 0.25f * 72.0f;
self.leftAndRightMarginSize = 0.25f * 72.0f;
}
return self;
}
- (id)initWithCustomPageSize:(CGSize)pageSize {
if (self = [super init]) {
self.pageSize = BNPageSizeCustom;
self.customPageSize = pageSize;
self.landscape = NO;
// Default 1/4" margins
self.topAndBottomMarginSize = 0.25f * 72.0f;
self.leftAndRightMarginSize = 0.25f * 72.0f;
}
return self;
}
- (void)dealloc {
[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(_timeout) object:nil];
[self.webView setDelegate:nil];
[self.webView stopLoading];
}
#pragma mark - Class Methods
+ (CGSize)sizeForPageSize:(BNPageSize)pageSize {
switch (pageSize) {
case BNPageSizeLetter:
return BNSizeMakeWithPPI(8.5f, 11.0f);
case BNPageSizeGovernmentLetter:
return BNSizeMakeWithPPI(8.0f, 10.5f);
case BNPageSizeLegal:
return BNSizeMakeWithPPI(8.5f, 14.0f);
case BNPageSizeJuniorLegal:
return BNSizeMakeWithPPI(8.5f, 5.0f);
case BNPageSizeLedger:
return BNSizeMakeWithPPI(17.0f, 11.0f);
case BNPageSizeTabloid:
return BNSizeMakeWithPPI(11.0f, 17.0f);
case BNPageSizeA0:
return BNSizeMakeWithPPI(33.11f, 46.81f);
case BNPageSizeA1:
return BNSizeMakeWithPPI(23.39f, 33.11f);
case BNPageSizeA2:
return BNSizeMakeWithPPI(16.54f, 23.39f);
case BNPageSizeA3:
return BNSizeMakeWithPPI(11.69f, 16.54f);
case BNPageSizeA4:
return BNSizeMakeWithPPI(8.26666667, 11.6916667);
case BNPageSizeA5:
return BNSizeMakeWithPPI(5.83f, 8.27f);
case BNPageSizeA6:
return BNSizeMakeWithPPI(4.13f, 5.83f);
case BNPageSizeA7:
return BNSizeMakeWithPPI(2.91f, 4.13f);
case BNPageSizeA8:
return BNSizeMakeWithPPI(2.05f, 2.91f);
case BNPageSizeA9:
return BNSizeMakeWithPPI(1.46f, 2.05f);
case BNPageSizeA10:
return BNSizeMakeWithPPI(1.02f, 1.46f);
case BNPageSizeB0:
return BNSizeMakeWithPPI(39.37f, 55.67f);
case BNPageSizeB1:
return BNSizeMakeWithPPI(27.83f, 39.37f);
case BNPageSizeB2:
return BNSizeMakeWithPPI(19.69f, 27.83f);
case BNPageSizeB3:
return BNSizeMakeWithPPI(13.90f, 19.69f);
case BNPageSizeB4:
return BNSizeMakeWithPPI(9.84f, 13.90f);
case BNPageSizeB5:
return BNSizeMakeWithPPI(6.93f, 9.84f);
case BNPageSizeB6:
return BNSizeMakeWithPPI(4.92f, 6.93f);
case BNPageSizeB7:
return BNSizeMakeWithPPI(3.46f, 4.92f);
case BNPageSizeB8:
return BNSizeMakeWithPPI(2.44f, 3.46f);
case BNPageSizeB9:
return BNSizeMakeWithPPI(1.73f, 2.44f);
case BNPageSizeB10:
return BNSizeMakeWithPPI(1.22f, 1.73f);
case BNPageSizeC0:
return BNSizeMakeWithPPI(36.10f, 51.06f);
case BNPageSizeC1:
return BNSizeMakeWithPPI(25.51f, 36.10f);
case BNPageSizeC2:
return BNSizeMakeWithPPI(18.03f, 25.51f);
case BNPageSizeC3:
return BNSizeMakeWithPPI(12.76f, 18.03f);
case BNPageSizeC4:
return BNSizeMakeWithPPI(9.02f, 12.76f);
case BNPageSizeC5:
return BNSizeMakeWithPPI(6.38f, 9.02f);
case BNPageSizeC6:
return BNSizeMakeWithPPI(4.49f, 6.38f);
case BNPageSizeC7:
return BNSizeMakeWithPPI(3.19f, 4.49f);
case BNPageSizeC8:
return BNSizeMakeWithPPI(2.24f, 3.19f);
case BNPageSizeC9:
return BNSizeMakeWithPPI(1.57f, 2.24f);
case BNPageSizeC10:
return BNSizeMakeWithPPI(1.10f, 1.57f);
case BNPageSizeJapaneseB0:
return BNSizeMakeWithPPI(40.55f, 57.32f);
case BNPageSizeJapaneseB1:
return BNSizeMakeWithPPI(28.66f, 40.55f);
case BNPageSizeJapaneseB2:
return BNSizeMakeWithPPI(20.28f, 28.66f);
case BNPageSizeJapaneseB3:
return BNSizeMakeWithPPI(14.33f, 20.28f);
case BNPageSizeJapaneseB4:
return BNSizeMakeWithPPI(10.12f, 14.33f);
case BNPageSizeJapaneseB5:
return BNSizeMakeWithPPI(7.17f, 10.12f);
case BNPageSizeJapaneseB6:
return BNSizeMakeWithPPI(5.04f, 7.17f);
case BNPageSizeJapaneseB7:
return BNSizeMakeWithPPI(3.58f, 5.04f);
case BNPageSizeJapaneseB8:
return BNSizeMakeWithPPI(2.52f, 3.58f);
case BNPageSizeJapaneseB9:
return BNSizeMakeWithPPI(1.77f, 2.52f);
case BNPageSizeJapaneseB10:
return BNSizeMakeWithPPI(1.26f, 1.77f);
case BNPageSizeJapaneseB11:
return BNSizeMakeWithPPI(0.87f, 1.26f);
case BNPageSizeJapaneseB12:
return BNSizeMakeWithPPI(0.63f, 0.87f);
case BNPageSizeCustom:
return CGSizeZero;
}
return CGSizeZero;
}
#pragma mark - Methods
- (CGSize)actualPageSize {
if (self.landscape) {
CGSize pageSize = [self _sizeFromPageSize:self.pageSize];
return CGSizeMake(pageSize.height, pageSize.width);
}
return [self _sizeFromPageSize:self.pageSize];
}
- (void)saveHtmlAsPdf:(NSString *)html {
[self saveHtmlAsPdf:html toFile:nil];
}
- (void)saveHtmlAsPdf:(NSString *)html toFile:(NSString *)file {
self.outputFile = file;
self.webView = [[UIWebView alloc] init];
self.webView.delegate = self;
if (!self.baseUrl) {
[self.webView loadHTMLString:html baseURL:[NSURL URLWithString:@"http://localhost"]];
} else {
[self.webView loadHTMLString:html baseURL:self.baseUrl];
}
}
- (void)saveUrlAsPdf:(NSURL *)url {
[self saveUrlAsPdf:url toFile:nil];
}
- (void)saveUrlAsPdf:(NSURL *)url toFile:(NSString *)file {
self.outputFile = file;
self.webView = [[UIWebView alloc] init];
self.webView.delegate = self;
if ([self.webView respondsToSelector:@selector(setSuppressesIncrementalRendering:)]) {
[self.webView setSuppressesIncrementalRendering:YES];
}
[self.webView loadRequest:[NSURLRequest requestWithURL:url]];
}
- (void)saveWebViewAsPdf:(UIWebView *)webView {
[self saveWebViewAsPdf:webView toFile:nil];
}
- (void)saveWebViewAsPdf:(UIWebView *)webView toFile:(NSString *)file {
[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(_timeout) object:nil];
self.outputFile = file;
webView.delegate = self;
self.webView = webView;
}
#pragma mark - UIWebViewDelegate
- (void)webViewDidFinishLoad:(UIWebView *)webView {
NSString *readyState = [webView stringByEvaluatingJavaScriptFromString:@"document.readyState"];
BOOL complete = [readyState isEqualToString:@"complete"];
[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(_timeout) object:nil];
if (complete) {
[self _savePdf];
} else {
[self performSelector:@selector(_timeout) withObject:nil afterDelay:1.0f];
}
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(_timeout) object:nil];
if (self.failureBlock) {
self.failureBlock(error);
}
if ([self.delegate respondsToSelector:@selector(htmlPdfKit:didFailWithError:)]) {
[self.delegate htmlPdfKit:self didFailWithError:error];
}
self.webView = nil;
}
#pragma mark - Private Methods
- (void)_timeout {
[self _savePdf];
}
- (void)_savePdf {
if (!self.webView) {
return;
}
UIPrintFormatter *formatter = self.webView.viewPrintFormatter;
BNHtmlPdfKitPageRenderer *renderer = [[BNHtmlPdfKitPageRenderer alloc] init];
renderer.topAndBottomMarginSize = self.topAndBottomMarginSize;
renderer.leftAndRightMarginSize = self.leftAndRightMarginSize;
renderer.headerView = self.headerView;
renderer.footerView = self.footerView;
[renderer setHeaderHeight:50.0f];
[renderer setFooterHeight:50.0f];
[renderer addPrintFormatter:formatter startingAtPageAtIndex:0];
NSMutableData *currentReportData = [NSMutableData data];
CGSize pageSize = [self actualPageSize];
CGRect pageRect = CGRectMake(0, 0, pageSize.width, pageSize.height);
UIGraphicsBeginPDFContextToData(currentReportData, pageRect, nil);
[renderer prepareForDrawingPages:NSMakeRange(0, 1)];
NSInteger pages = [renderer numberOfPages];
for (NSInteger i = 0; i < pages; i++) {
UIGraphicsBeginPDFPage();
//
// if (self.headerView != nil)
// {
// [self.headerView setFrame:CGRectMake(0, 0, pageSize.width, 50)];
//
// [renderer setHeaderHeight:self.headerView.frame.size.height];
// [self.headerView.layer renderInContext:UIGraphicsGetCurrentContext()];
// }
[renderer drawPageAtIndex:i inRect:renderer.paperRect];
//
// if (self.footerView != nil)
// {
// NSLog(@"Page H: %f", pageSize.height);
//
// [self.footerView setFrame:CGRectMake(0, pageSize.height-50, pageSize.width, 50)];
// [self.footerView.layer setFrame:CGRectMake(0, pageSize.height-50, pageSize.width, 50)];
//
// [renderer setFooterHeight:self.footerView.frame.size.height];
// [self.footerView.layer renderInContext:UIGraphicsGetCurrentContext()];
// }
}
UIGraphicsEndPDFContext();
if (self.dataCompletionBlock) {
self.dataCompletionBlock(currentReportData);
}
if (self.fileCompletionBlock) {
self.fileCompletionBlock(self.outputFile);
}
if ([self.delegate respondsToSelector:@selector(htmlPdfKit:didSavePdfData:)]) {
[self.delegate htmlPdfKit:self didSavePdfData:currentReportData];
}
if (self.outputFile) {
[currentReportData writeToFile:self.outputFile atomically:YES];
if ([self.delegate respondsToSelector:@selector(htmlPdfKit:didSavePdfFile:)]) {
[self.delegate htmlPdfKit:self didSavePdfFile:self.outputFile];
}
}
self.webView = nil;
}
- (CGSize)_sizeFromPageSize:(BNPageSize)pageSize {
if (pageSize == BNPageSizeCustom) {
return self.customPageSize;
}
return [BNHtmlPdfKit sizeForPageSize:pageSize];
}
+ (BNPageSize)defaultPageSize {
NSLocale *locale = [NSLocale currentLocale];
BOOL useMetric = [[locale objectForKey:NSLocaleUsesMetricSystem] boolValue];
BNPageSize pageSize = (useMetric ? BNPageSizeA4 : BNPageSizeLetter);
return pageSize;
}
@end
答案 0 :(得分：1)
@property (strong, nonatomic) BNHtmlPdfKit *htmlPdfKit;
然后
self.htmlPdfKit = [[BNHtmlPdfKit alloc] init];
self.htmlPdfKit.delegate = self;
UIImageView *headerImage =[[UIImageView alloc] initWithFrame:CGRectMake(50,50,500,500)];
headerImage.image=[UIImage imageNamed:@"header_logo.png"];
self.htmlPdfKit.headerView = headerImage;
self.htmlPdfKit.pageSize = BNPageSizeA4;
[htmlPdfKit saveUrlAsPdf:[NSURL URLWithString:@"......."] toFile:@"......."];