刚一开始想的方法自然就是Screen Capture,然后图片做PDF,那效果可想而知了,iPhone上截图就是固定的320*480,做出来的都是模糊的。
后来参考了网上的一个将HTML页面转存为多页的PDF的帖子,整了一段时间终于整出来了,效果还行,至少不是单纯图片,而且文字部分都能出来。
1. 子类化 UIPrintPageRenderer用于分页
@interface MyPrintPageRender : UIPrintPageRenderer - (NSData*) convertUIWebViewToPDFsaveWidth: (float)pdfWidth saveHeight:(float) pdfHeight; @end
@implementation MyPrintPageRender { BOOL _generatingPdf; } - (CGRect) paperRect { if (!_generatingPdf) return [super paperRect]; return UIGraphicsGetPDFContextBounds(); } - (CGRect) printableRect { if (!_generatingPdf) return [super printableRect]; return CGRectInset( self.paperRect, 20, 20 ); } - (NSData*) convertUIWebViewToPDFsaveWidth: (float)pdfWidth saveHeight:(float) pdfHeight { _generatingPdf = YES; NSMutableData *pdfData = [NSMutableData data]; UIGraphicsBeginPDFContextToData( pdfData, CGRectMake(0, 0, pdfWidth, pdfHeight), nil ); [self prepareForDrawingPages: NSMakeRange(0, 1)]; CGRect bounds = UIGraphicsGetPDFContextBounds(); for ( int i = 0 ; i < self.numberOfPages ; i++ ) { UIGraphicsBeginPDFPage(); [self drawPageAtIndex: i inRect: bounds]; } UIGraphicsEndPDFContext(); _generatingPdf = NO; return pdfData; } @end
2. 调用PageRenderer的部分
// width 和height 按自己定义即可,比如说A4大小 float pdfWidth = 595.0f; float pdfHeight = 842.0f; MyPrintPageRender *myRenderer = [[MyPrintPageRender alloc] init]; UIViewPrintFormatter *viewFormatter = [self.imgView viewPrintFormatter]; [myRenderer addPrintFormatter:viewFormatter startingAtPageAtIndex:0]; NSData *pdfData = [myRenderer convertUIWebViewToPDFsaveWidth: pdfWidth saveHeight:pdfHeight]; [pdfData writeToFile:fileFullPath atomically:YES]; [myRenderer release];