kmpdfkit_demo/PDFViewer/Source/PDFSignature/PDFSignatureViewController.m

//
//  PDFSignatureViewController.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 "PDFSignatureViewController.h"
#import "PDFSignatureManager.h"
#import "PDFSignatureEditViewController.h"

@interface PDFSignatureViewCell : UITableViewCell

@property (nonatomic,retain) UIImageView *imgView;

@end

@implementation PDFSignatureViewCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        _imgView = [[UIImageView alloc] init];
        [self.contentView addSubview:_imgView];
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    CGFloat height = self.contentView.bounds.size.height;
    CGFloat width  = height *  self.imgView.image.size.width / self.imgView.image.size.height;
    width = MIN(width, self.contentView.bounds.size.width - 80.0);
    [self.imgView setFrame:CGRectMake((self.bounds.size.width - width)/2.0, 0.0, width, height)];
    self.imgView.center = self.contentView.center;
}

@end


@interface PDFSignatureViewController () <UITableViewDelegate,UITableViewDataSource>

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

@property (nonatomic,assign) IBOutlet UIView *emptyView;
@property (nonatomic,assign) IBOutlet UIButton *createButton;

@end

@implementation PDFSignatureViewController

#pragma mark - Init Methods

- (void)dealloc {
    Block_release(_callback);
    [super dealloc];
}

#pragma mark - UIViewController Methods

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    self.navigationItem.rightBarButtonItem = self.editButtonItem;
    self.editing = NO;
    
    self.createButton.layer.borderColor = [UIColor colorWithRed:0.0 green:122.0/255.0 blue:255.0/255.0 alpha:1.0].CGColor;
    self.createButton.layer.borderWidth = 1.0;
    self.createButton.layer.cornerRadius = 5.0;
    
    [self.tableView registerClass:[PDFSignatureViewCell class] forCellReuseIdentifier:@"cell"];
}

- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
    [super setEditing:editing animated:animated];
    
    [self.tableView setEditing:editing animated:animated];
    if (editing) {
        UIBarButtonItem *selectAllItem = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Select All", nil)
                                                                          style:UIBarButtonItemStylePlain
                                                                         target:self
                                                                         action:@selector(buttonItemClicked_SelectAll:)];
        
        UIBarButtonItem *deleteItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash
                                                                                    target:self
                                                                                    action:@selector(buttonItemClicked_Delete:)];
        
        [self.navigationItem setLeftBarButtonItems:@[selectAllItem, deleteItem] animated:animated];
        [selectAllItem release];
        [deleteItem release];
    } else {
        UIBarButtonItem *cancelItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel
                                                                                    target:self
                                                                                    action:@selector(buttonItemClicked_Cancel:)];
        [self.navigationItem setLeftBarButtonItems:@[cancelItem] animated:animated];
        [cancelItem release];
    }
}

#pragma mark - Button Actions

- (IBAction)buttonItemClicked_Create:(id)sender {
    PDFSignatureEditViewController *vc = [[PDFSignatureEditViewController alloc] init];
    vc.callback = ^(UIImage *image) {
        if (image) {
            [[PDFSignatureManager sharedManager] addSignature:image];
            [self.tableView reloadData];
        }
    };
    if (UIUserInterfaceIdiomPad == UI_USER_INTERFACE_IDIOM()) {
        UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
        nav.modalPresentationStyle = UIModalPresentationFormSheet;
        [self presentViewController:nav animated:YES completion:nil];
        [nav release];
        [vc release];
    } else {
        PDFSignatureNavigationController *nav = [[PDFSignatureNavigationController alloc] initWithRootViewController:vc];
        [self presentViewController:nav animated:YES completion:nil];
        [nav release];
        [vc release];
    }
}

- (void)buttonItemClicked_Cancel:(id)sender {
    if (self.tableView.editing) {
        self.tableView.editing = NO;
    } else {
        [self dismissViewControllerAnimated:YES completion:^{
            if (self.callback) {
                self.callback(nil);
                self.callback = nil;
            }
        }];
    }
}

- (void)buttonItemClicked_SelectAll:(id)sender {
    NSInteger numberOfRowsInSection = [self.tableView numberOfRowsInSection:0];
    if (self.tableView.indexPathsForSelectedRows.count != numberOfRowsInSection) {
        for (NSInteger i=0; i<numberOfRowsInSection; i++) {
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
            [self.tableView selectRowAtIndexPath:indexPath
                                        animated:YES
                                  scrollPosition:UITableViewScrollPositionNone];
        }
    } else {
        for (NSInteger i=0; i<numberOfRowsInSection; i++) {
            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
            [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
        }
    }
}

- (void)buttonItemClicked_Delete:(id)sender {
    NSMutableIndexSet *indexSet = [NSMutableIndexSet indexSet];
    for (NSIndexPath *indexPath in self.tableView.indexPathsForSelectedRows) {
        [indexSet addIndex:indexPath.row];
    }
    [[PDFSignatureManager sharedManager] removeSignaturesAtIndexes:indexSet];
    if ([PDFSignatureManager sharedManager].signatures.count < 1) {
        [self setEditing:NO animated:YES];
    }
    [self.tableView reloadData];
}

#pragma mark - UITableViewDataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if ([PDFSignatureManager sharedManager].signatures.count <= 0) {
        self.emptyView.hidden = NO;
        self.tableView.hidden = YES;
        self.navigationItem.rightBarButtonItem = nil;
    } else {
        self.emptyView.hidden = YES;
        self.tableView.hidden = NO;
        self.navigationItem.rightBarButtonItem = self.editButtonItem;
    }
    return [PDFSignatureManager sharedManager].signatures.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    PDFSignatureViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    cell.imgView.image = [UIImage imageWithContentsOfFile:[PDFSignatureManager sharedManager].signatures[indexPath.row]];
    return cell;
}

#pragma mark - UITableViewDelegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    if (!tableView.isEditing) {
        [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
        [self dismissViewControllerAnimated:YES completion:^{
            UIImage *image = [UIImage imageWithContentsOfFile:[PDFSignatureManager sharedManager].signatures[indexPath.row]];
            if (self.callback) {
                self.callback(image);
                self.callback = nil;
            }
        }];
    }
}

@end