iphone - 如何使用 quartz 在pdf文档中搜索文本

Question

我正在使用 quartz 来显示 pdf。我需要获取我的搜索文本所在页面的索引。任何人都可以帮助我吗？谢谢。

解决方案:有一个代码示例可以从页面中提取文本并检查其序列。

#import <Foundation/Foundation.h>

@interface PDFSearcher : NSObject {
    CGPDFOperatorTableRef table;
    NSMutableString *currentData;
}

@property (nonatomic, retain) NSMutableString * currentData;
-(id)init;
-(BOOL)page:(CGPDFPageRef)inPage containsString:(NSString *)inSearchString;

@end

#import "PDFSearcher.h"

@implementation PDFSearcher
@synthesize currentData;
void arrayCallback(CGPDFScannerRef inScanner, void *userInfo)
{
    PDFSearcher * searcher = (PDFSearcher *)userInfo;

    CGPDFArrayRef array;

    bool success = CGPDFScannerPopArray(inScanner, &array);

    for(size_t n = 0; n < CGPDFArrayGetCount(array); n += 2)
    {
        if(n >= CGPDFArrayGetCount(array))
            continue;

        CGPDFStringRef string;
        success = CGPDFArrayGetString(array, n, &string);
        if(success)
        {
            NSString *data = (NSString *)CGPDFStringCopyTextString(string);
            [searcher.currentData appendFormat:@"%@", data];
            [data release];
        }
    }
}

void stringCallback(CGPDFScannerRef inScanner, void *userInfo)
{
    PDFSearcher *searcher = (PDFSearcher *)userInfo;

    CGPDFStringRef string;

    bool success = CGPDFScannerPopString(inScanner, &string);

    if(success)
    {
        NSString *data = (NSString *)CGPDFStringCopyTextString(string);
        [searcher.currentData appendFormat:@"%@", data];
        [data release];

    }
}

-(id)init
{
    if(self = [super init])
    {
        table = CGPDFOperatorTableCreate();
        CGPDFOperatorTableSetCallback(table, "TJ", arrayCallback);
        CGPDFOperatorTableSetCallback(table, "Tj", stringCallback);
    }
    return self;
}

-(BOOL)page:(CGPDFPageRef)inPage containsString:(NSString *)inSearchString
{
    [self setCurrentData:[NSMutableString string]];
    CGPDFContentStreamRef contentStream = CGPDFContentStreamCreateWithPage(inPage);
    CGPDFScannerRef scanner = CGPDFScannerCreate(contentStream, table, self);
    bool ret = CGPDFScannerScan(scanner);
    CGPDFScannerRelease(scanner);
    CGPDFContentStreamRelease(contentStream);
    //NSLog(@"%u, %@", [self.currentData length], self.currentData);
    return ([[self.currentData uppercaseString] 
             rangeOfString:[inSearchString uppercaseString]].location != NSNotFound);
}
@end

Answer 1

使用CGPDFDocument、CGPDFPage和CGPDFScanner扫描并解析页面内容为NSString。然后使用 NSString 函数查找该页面上的文本。如果存在，则将相应的页码存储在某个数组中。重复此扫描并在 for 循环中解析 pdf 中的页数