kmpdfkit_demo/PDFViewer/Source/PDFSignature/PDFSignatureColorViewController.m

//
//  PDFSignatureColorViewController.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 "PDFSignatureColorViewController.h"

@interface PDFSignatureColorViewController () <UIPopoverPresentationControllerDelegate>

@property (nonatomic,assign) IBOutlet UIScrollView *scrollView;
@property (nonatomic,assign) IBOutlet UISlider *slider;

@property (nonatomic,retain) UIView *selectedView;

@end

@implementation PDFSignatureColorViewController

#pragma mark - Init Methods

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

#pragma mark - UIViewController Methods

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Do any additional setup after loading the view from its nib.
    self.preferredContentSize = CGSizeMake(300, 130);
    
    _selectedView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
    _selectedView.backgroundColor = [UIColor clearColor];
    _selectedView.layer.masksToBounds = YES;
    _selectedView.layer.borderColor = [UIColor lightGrayColor].CGColor;
    _selectedView.layer.borderWidth = 1.0;
    _selectedView.layer.cornerRadius = 25;
    [self.scrollView addSubview:_selectedView];
    
    NSArray *colors = @[[UIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:1.0f],
                        [UIColor colorWithRed:19.0f/255.0f green:51.0f/255.0f blue:144.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:39.0f/255.0f green:190.0f/255.0f blue:253.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:0.0f/255.0f green:255.0f/255.0f blue:54.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:252.0f/255.0f green:255.0f/255.0f blue:54.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:253.0f/255.0f green:126.0f/255.0f blue:21.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:254.0f/255.0f green:134.0f/255.0f blue:106.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:166.0f/255.0f green:29.0f/255.0f blue:251.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:1.0f green:27.0f/255.0f blue:137.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:221.0f/255.0f green:2.0f/255.0f blue:2.0f/255.0f alpha:1.0f],
                        [UIColor colorWithRed:1.0f green:1.0f blue:1.0f alpha:1.0f]];
    NSMutableArray *buttons = [NSMutableArray array];
    CGFloat posX = 5;
    for (int i=0; i <[colors count]; i++){
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(posX, 5, 40, 40);
        button.backgroundColor = colors[i];
        button.layer.masksToBounds = YES;
        button.layer.cornerRadius = 20;
        [button addTarget:self action:@selector(buttonItemClicked_Color:) forControlEvents:UIControlEventTouchUpInside];
        [self.scrollView addSubview:button];
        [buttons addObject:button];
        
        if (self.color && [self isTheSameColor:self.color anotherColor:button.backgroundColor]) {
            self.selectedView.center = button.center;
        }
        
        posX += button.bounds.size.width+10;
    }
    self.scrollView.contentSize = CGSizeMake(posX, self.scrollView.bounds.size.height);

    self.slider.value = self.lineWidth;
}

#pragma mark - Button Actions

- (IBAction)buttonItemClicked_Color:(UIButton *)button {
    self.selectedView.center = button.center;
    self.color = button.backgroundColor;
    if (self.callback) {
        self.callback();
    }
}

- (IBAction)sliderValueChanged_LineWidth:(UISlider *)slider {
    self.lineWidth = slider.value;
    if (self.callback) {
        self.callback();
    }
}

#pragma mark - Private Methods

- (BOOL)isTheSameColor:(UIColor *)color1 anotherColor:(UIColor *)color2 {
    const CGFloat* component = CGColorGetComponents(color1.CGColor);
    const CGFloat* component1 = CGColorGetComponents(color2.CGColor);
    if (fabs(component[0]-component1[0])>1e-6) return NO;
    if (fabs(component[1]-component1[1])>1e-6) return NO;
    if (fabs(component[2]-component1[2])>1e-6) return NO;
    if (fabs(component[3]-component1[3])>1e-6) return NO;
    return YES;
}

#pragma mark - Public Methods

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

#pragma mark - UIPopoverPresentationControllerDelegate

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

@end