把UIImage转成PDF进行保存

UIImage * imgForBase64 = [UIImage imageFromBase64ToWithStr:self.base64Data];

/// base64str->Image
+ (UIImage *)imageFromBase64ToWithStr:(NSString *)str{
    
    NSString *base64Str = [str copy];
    if ([base64Str containsString:@"data:image/jpeg;base64,"]) {
        base64Str = [base64Str stringByReplacingOccurrencesOfString:@"data:image/jpeg;base64," withString:@""];
    }else if ([base64Str containsString:@"data:image/png;base64,"]) {
        base64Str = [base64Str stringByReplacingOccurrencesOfString:@"data:image/png;base64," withString:@""];
    }
    if (kStringIsEmpty(base64Str)) {
        return nil;
    }
    NSData *decodeData = [[NSData alloc]initWithBase64EncodedString:base64Str options:NSDataBase64DecodingIgnoreUnknownCharacters];
    UIImage *image = [[UIImage alloc]initWithData:decodeData];
    return image;
}

///文件夹根目录
    NSString * localFileDirectory = [PATH_OF_DOCUMENT stringByAppendingPathComponent:@"/PDF"];
    
    NSFileManager *fileManger = [NSFileManager defaultManager];
    //  创建文件夹目录
    if (![[NSFileManager defaultManager] contentsOfDirectoryAtPath:localFileDirectory error:nil]) {
        [fileManger createDirectoryAtPath:localFileDirectory withIntermediateDirectories:YES attributes:nil error:nil];
    }
    //  创建文件路径
    NSString *fileNamePath = [localFileDirectory stringByAppendingPathComponent:self.fileName];

 // 绘制PDF
    CGRect frame = CGRectMake(0, 0, imgForBase64.size.width, imgForBase64.size.height);
    // Create the PDF context using the default page size of 612 x 792.
    UIGraphicsBeginPDFContextToFile(fileNamePath, CGRectZero, nil);
    // Mark the beginning of a new page.
    UIGraphicsBeginPDFPageWithInfo(frame, nil);
    [imgForBase64 drawInRect:frame];
    // Close the PDF context and write the contents out.
    UIGraphicsEndPDFContext();