kmpdfkit_demo/PDFViewer/Source/PDFSearch/PDFSearchViewController.m

//
//  PDFSearchViewController.m
//  PDFReader
//
//  Copyright © 2014-2022 PDF Technologies, Inc. All Rights Reserved.
//
//  The PDF Reader Sample applications are licensed with a modified BSD license.
//  Please see License for details. This notice may not be removed from this file.
//

#import "PDFSearchViewController.h"
#import "PDFFindTextView.h"

#define kTextSearch_Content_Length_Max 100

@interface PDFSearchViewCell : UITableViewCell

@property (nonatomic,assign) IBOutlet UILabel *label;

@end

@implementation PDFSearchViewCell

@end



@interface PDFSearchViewController () <UIPopoverPresentationControllerDelegate>

@property (nonatomic,assign) IBOutlet UITableView *tableView;
@property (nonatomic,assign) IBOutlet UISearchBar *searchBar;

@property (nonatomic,assign) IBOutlet UIView *pageView;
@property (nonatomic,assign) IBOutlet UITextField *textField;

@property (nonatomic,assign) IBOutlet UIView *titleView;
@property (nonatomic,assign) IBOutlet UIButton *searchButton;
@property (nonatomic,assign) IBOutlet UIButton *pageButton;
@property (nonatomic,assign) IBOutlet UIView *indicator;

@property (nonatomic,retain) IBOutlet PDFFindTextView *findTextView;
@property (nonatomic, retain) UIActivityIndicatorView* loadingView;

@property (nonatomic,retain) NSArray *resultArray;

@property (nonatomic,retain) NSIndexPath *selecetdIndexPath;

@end

@implementation PDFSearchViewController

#pragma mark - Init Methods

- (void)dealloc {
    [_loadingView release];
    [_findTextView release];
    [_selecetdIndexPath release];
    [_resultArray release];
    [super dealloc];
}

#pragma mark - UIViewController Methods

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Do any additional setup after loading the view from its nib.
    self.title = NSLocalizedString(@"Search", nil);
    self.preferredContentSize = CGSizeMake(320, 480);
    
    [self.tableView registerNib:[UINib nibWithNibName:@"PDFSearchViewCell" bundle:nil] forCellReuseIdentifier:@"cell"];
    
    self.navigationItem.titleView = self.titleView;
    [self buttonItemClicked_Text:nil];
    
    __block __typeof(self) blockSelf = self;
    self.findTextView.callback = ^(NSInteger index) {
        if (index == 0) {
            [blockSelf buttonItemClicked_Previous:nil];
        } else if (index == 1) {
            [blockSelf buttonItemClicked_Next:nil];
        } else {
            [blockSelf.findTextView removeFromSuperview];
            [blockSelf.pdfViewController.pdfView setHighlightedSelection:nil animated:NO];
        }
    };
}

- (UIActivityIndicatorView *)loadingView {
    if (!_loadingView) {
        _loadingView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
        _loadingView.center = self.view.center;
        _loadingView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
    }
    return _loadingView;
}

#pragma mark - Button Actions

- (IBAction)buttonItemClicked_Text:(id)sender {
    CGRect frame = self.indicator.frame;
    CGPoint center = self.indicator.center;
    frame.size.width = self.searchButton.frame.size.width+20;
    center.x = self.searchButton.center.x;
    self.indicator.frame = frame;
    self.indicator.center = center;
    
    self.tableView.hidden = NO;
    self.pageView.hidden = YES;
    
    self.searchBar.keyboardType = UIKeyboardTypeDefault;
    self.searchBar.placeholder = NSLocalizedString(@"Search Text", nil);
    [self.searchBar becomeFirstResponder];
    
    self.navigationItem.rightBarButtonItem = nil;
}

- (IBAction)buttonItemClicked_Page:(id)sender {
    CGRect frame = self.indicator.frame;
    CGPoint center = self.indicator.center;
    frame.size.width = self.pageButton.frame.size.width+20;
    center.x = self.pageButton.center.x;
    self.indicator.frame = frame;
    self.indicator.center = center;
    
    self.tableView.hidden = YES;
    self.pageView.hidden = NO;

    [self.textField setReturnKeyType:UIReturnKeyGo];
    self.textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    [self.textField setKeyboardType:UIKeyboardTypeNumberPad];
    self.textField.placeholder = [NSString stringWithFormat:NSLocalizedString(@"%d - %d", nil), 1, self.pdfViewController.pdfView.document.pageCount];
    [self.textField becomeFirstResponder];
    
    UIBarButtonItem *doneItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                              target:self
                                                                              action:@selector(buttonItemClicked_Done:)];
    self.navigationItem.rightBarButtonItem = doneItem;
    [doneItem release];
}

- (void)buttonItemClicked_Done:(id)sender {
    [self dismissViewControllerAnimated:YES completion:^{
        NSUInteger page = [self.textField.text integerValue]-1;
        [self.pdfViewController.pdfView goToPageIndex:page animated:NO];
    }];
}

- (void)buttonItemClicked_Previous:(id)sender {
    NSInteger section = 0;
    NSInteger row = 0;
    if (self.selecetdIndexPath.row == 0) {
        if (self.selecetdIndexPath.section == 0) {
            section = self.tableView.numberOfSections-1;
        } else {
            section = self.selecetdIndexPath.section-1;
        }
        row = [self.tableView numberOfRowsInSection:section]-1;
    } else {
        section = self.selecetdIndexPath.section;
        row = self.selecetdIndexPath.row-1;
    }
    self.selecetdIndexPath = [NSIndexPath indexPathForRow:row inSection:section];

    if (section >= self.resultArray.count) {
        return;
    }
    CPDFSelection *selection = self.resultArray[section][row];
    NSInteger pageIndex = [self.pdfViewController.pdfView.document indexForPage:selection.page];
    [self.pdfViewController.pdfView goToPageIndex:pageIndex animated:NO];
    [self.pdfViewController.pdfView setHighlightedSelection:selection animated:YES];
}

- (void)buttonItemClicked_Next:(id)sender {
    NSInteger section = 0;
    NSInteger row = 0;
    NSInteger count = [self.tableView numberOfRowsInSection:self.selecetdIndexPath.section];
    if (self.selecetdIndexPath.row == count-1) {
        if (self.selecetdIndexPath.section == self.tableView.numberOfSections-1) {
            section = 0;
        } else {
            section = self.selecetdIndexPath.section+1;
        }
        row = 0;
    } else {
        section = self.selecetdIndexPath.section;
        row = self.selecetdIndexPath.row+1;
    }
    self.selecetdIndexPath = [NSIndexPath indexPathForRow:row inSection:section];

    if (section >= self.resultArray.count) {
        return;
    }
    CPDFSelection *selection = self.resultArray[section][row];
    NSInteger pageIndex = [self.pdfViewController.pdfView.document indexForPage:selection.page];
    [self.pdfViewController.pdfView goToPageIndex:pageIndex animated:NO];
    [self.pdfViewController.pdfView setHighlightedSelection:selection animated:YES];
}

#pragma mark - Private Methods

- (NSAttributedString *)attributedString:(NSString *)desContent keyword:(NSString *)string location:(NSInteger)location {
    NSString *lowerContents = [desContent lowercaseString];
    NSString *keyword  = [string lowercaseString];
    NSRange keywordRange = [lowerContents rangeOfString:keyword];
    NSInteger index = 0;
    while (keywordRange.location != NSNotFound) {
        if (index == location) {
            break;
        }
        index++;
        NSInteger start = keywordRange.location+keywordRange.length;
        NSRange searchRange = NSMakeRange(start, lowerContents.length - start);
        keywordRange = [lowerContents rangeOfString:keyword options:NSCaseInsensitiveSearch range:searchRange];
    }
    
    NSString* contents = nil;
    if (desContent.length < kTextSearch_Content_Length_Max) {
        contents = desContent;
        contents = [NSString stringWithFormat:@"%@...",contents];
    } else {
        NSInteger offset = (kTextSearch_Content_Length_Max - keywordRange.length)/2.0;
        offset = keywordRange.location - offset;
        if (offset < 0) {
            contents = [desContent substringWithRange:NSMakeRange(0, kTextSearch_Content_Length_Max)];
            contents = [NSString stringWithFormat:@"%@...",contents];
        } else {
            if (offset >= [desContent length]) {
                offset = 0;
            }
            NSInteger tLen = 0;
            if (desContent.length - offset > kTextSearch_Content_Length_Max) {
                tLen = kTextSearch_Content_Length_Max;
            } else {
                tLen = desContent.length - offset;
            }
            contents = [desContent substringWithRange:NSMakeRange(offset, tLen)];
            contents = [NSString stringWithFormat:@"%@...",contents];
            keywordRange.location = keywordRange.location - offset;
        }
    }
    
    NSMutableAttributedString *attrString = [[[NSMutableAttributedString alloc] initWithString:contents] autorelease];
    NSMutableParagraphStyle *paragraphStyle = [[[NSMutableParagraphStyle alloc]init] autorelease];
    paragraphStyle.firstLineHeadIndent = 10.0;
    paragraphStyle.headIndent = 10.0;
    paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;
    NSDictionary* dic = [NSDictionary dictionaryWithObjectsAndKeys:[UIFont fontWithName:@"HelveticaNeue-Medium" size:14.0],NSFontAttributeName,[UIColor colorWithRed:25.0/255.0 green:25.0/255.0 blue:25.0/255.0 alpha:1.0],NSForegroundColorAttributeName,paragraphStyle,NSParagraphStyleAttributeName,nil];
    
    NSRange range = [[attrString string] rangeOfString:[attrString string]];
    [attrString setAttributes:dic range:range];
    
    dic = [NSDictionary dictionaryWithObjectsAndKeys:[UIColor colorWithRed:1.0 green:220.0/255.0 blue:27.0/255.0 alpha:1.0],NSBackgroundColorAttributeName,nil];
    [attrString addAttributes:dic range:keywordRange];
    
    return attrString;
}

#pragma mark - Public Methods

- (void)showViewController:(UIViewController *)viewController inBarButtonItem:(UIBarButtonItem *)barButtonItem {
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self];
    nav.modalPresentationStyle = UIModalPresentationPopover;
    UIPopoverPresentationController *popVC = nav.popoverPresentationController;
    popVC.delegate = self;
    popVC.barButtonItem = barButtonItem;
    popVC.permittedArrowDirections = UIPopoverArrowDirectionUp;
    [viewController presentViewController:nav animated:YES completion:nil];
    [nav release];
}

#pragma mark - UIPopoverPresentationControllerDelegate

- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller traitCollection:(UITraitCollection *)traitCollection {
    return UIModalPresentationNone;
}

- (void)popoverPresentationControllerDidDismissPopover:(UIPopoverPresentationController *)popoverPresentationController {
    if (UIUserInterfaceIdiomPad == UI_USER_INTERFACE_IDIOM()) {
        [self.pdfViewController.pdfView setHighlightedSelection:nil animated:NO];
    }
}

#pragma mark - UISearchBarDelegate

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    [searchBar resignFirstResponder];
    
    if (![[CPDFKit sharedInstance] allowsFeature:CPDFKitFeatureViewerSearch]) {
        UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"OK", nil)
                                                               style:UIAlertActionStyleCancel
                                                             handler:nil];
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
                                                                       message:NSLocalizedString(@"Your license does not support this feature, please upgrade your license privilege.", nil)
                                                                preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:cancelAction];
        [self presentViewController:alert animated:YES completion:nil];
        return;
    }
    
    NSString *string = searchBar.text;
    if ([string length] < 1) {
        return;
    }
    
    if (![self.loadingView superview]) {
        [self.view addSubview:self.loadingView];
    }
    [self.loadingView startAnimating];
    
    __block __typeof(self) block_self = self;
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        NSArray *results = [block_self.pdfViewController.pdfView.document findString:string withOptions:CPDFSearchCaseInsensitive];
        dispatch_async(dispatch_get_main_queue(), ^{
            [block_self.loadingView removeFromSuperview];
            block_self.resultArray = results;
            [block_self.tableView reloadData];
            
            if ([block_self.resultArray count] < 1) {
                UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil
                                                                               message:NSLocalizedString(@"Text not found!", nil)
                                                                        preferredStyle:UIAlertControllerStyleAlert];
                
                UIViewController *tRootViewControl = [UIApplication sharedApplication].keyWindow.rootViewController;
                if ([tRootViewControl presentedViewController]) {
                    tRootViewControl = [tRootViewControl presentedViewController];
                }
                
                [tRootViewControl presentViewController:alert animated:YES completion:nil];
                dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
                    [alert dismissViewControllerAnimated:YES completion:nil];
                });
                
            }
        });
    });
}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
    self.resultArray = nil;
    [self.tableView reloadData];
}

#pragma mark - UITextFieldDelegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [self buttonItemClicked_Done:nil];
    return YES;
}

#pragma mark - UITableViewDatasource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return [self.resultArray count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    NSArray *array = [self.resultArray objectAtIndex:section];
    return [array count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    PDFSearchViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    
    CPDFSelection *selection = self.resultArray[indexPath.section][indexPath.row];
    NSInteger location = selection.range.location - 20;
    NSInteger length = selection.range.length + 40;
    if (location < 0) {
        location = 0;
        length = selection.range.location + selection.range.length + 20;
    }
    NSString *searchContent = [selection.page stringForRange:NSMakeRange(location, length)];
    cell.label.attributedText = [self attributedString:searchContent keyword:self.searchBar.text location:location];
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    return 30;
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    NSArray *array = [self.resultArray objectAtIndex:section];
    CPDFSelection *selection = array.firstObject;
    NSInteger pageIndex = [self.pdfViewController.pdfView.document indexForPage:selection.page];
    NSString *pageStr = [NSString stringWithFormat:NSLocalizedString(@"Page %d",nil), (long)(pageIndex+1)];
    NSString *countStr = [NSString stringWithFormat:@"%@", @(array.count)];
    
    UITableViewHeaderFooterView *view = [[[UITableViewHeaderFooterView alloc] initWithFrame:CGRectMake(0, 0, tableView.bounds.size.width, 30)] autorelease];
    view.autoresizingMask = UIViewAutoresizingFlexibleWidth;
    view.backgroundColor = [UIColor colorWithWhite:0.8 alpha:1.0];
    
    UILabel *label = [[[UILabel alloc] init] autorelease];
    label.font = [UIFont boldSystemFontOfSize:16];
    label.text = pageStr;
    [label sizeToFit];
    label.frame = CGRectMake(10, 0, label.bounds.size.width, view.bounds.size.height);
    [view.contentView addSubview:label];
    
    UILabel *sublabel = [[[UILabel alloc] init] autorelease];
    sublabel.font = [UIFont systemFontOfSize:14];
    sublabel.text = countStr;
    sublabel.textColor = [UIColor colorWithRed:0.0 green:122.0/255.0 blue:1.0 alpha:1.0];
    [sublabel sizeToFit];
    sublabel.frame = CGRectMake(view.bounds.size.width-sublabel.bounds.size.width-10, 0,
                                sublabel.bounds.size.width, view.bounds.size.height);
    sublabel.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;
    [view.contentView addSubview:sublabel];
    
    return view;
}

#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    
    CPDFSelection *selection = self.resultArray[indexPath.section][indexPath.row];
    if (UIUserInterfaceIdiomPad == UI_USER_INTERFACE_IDIOM()) {
        NSInteger pageIndex = [self.pdfViewController.pdfView.document indexForPage:selection.page];
        [self.pdfViewController.pdfView goToPageIndex:pageIndex animated:NO];
        [self.pdfViewController.pdfView setHighlightedSelection:selection animated:YES];
    } else {
        [self dismissViewControllerAnimated:YES completion:^{
            NSInteger pageIndex = [self.pdfViewController.pdfView.document indexForPage:selection.page];
            [self.pdfViewController.pdfView goToPageIndex:pageIndex animated:NO];
            [self.pdfViewController.pdfView setHighlightedSelection:selection animated:YES];
            
            self.selecetdIndexPath = indexPath;
            self.findTextView.center = CGPointMake(self.pdfViewController.view.frame.size.width/2.0, self.pdfViewController.view.frame.size.height-self.findTextView.frame.size.height/2.0-60);
            [self.pdfViewController.view addSubview:self.findTextView];
        }];
    }
}

@end