kmpdfkit_demo/PDFViewer/Source/PDFFreehand/PDFFreehandViewController.m

//
//  PDFFreehandViewController.h
//  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 "PDFFreehandViewController.h"
#import "ColorView.h"

@interface PDFFreehandDrawView : UIView

@property (nonatomic,retain) UIColor *lineColor;
@property (nonatomic,assign) CGFloat  lineWidth;
@property (nonatomic,assign) CGFloat  lineOpacity;

@end

@implementation PDFFreehandDrawView

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        _lineColor = [[UIColor redColor] retain];
        _lineOpacity = 0.7;
        _lineWidth = 3.0;
    }
    return self;
}

- (void)drawRect:(CGRect)rect {
    [super drawRect:rect];
    
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    if (!ctx) {
        return;
    }
    float tOffsetX = 20.0;
    float tSpaceX  = (self.bounds.size.width - 2*tOffsetX) / 3.0;
    float tSpaceY  = 50.0;
    CGContextSetRGBFillColor(ctx,240.0/255.0, 240.0/255.0, 240.0/255.0, 1.0);
    CGContextFillRect(ctx, self.bounds);
    
    CGContextSetStrokeColorWithColor(ctx, _lineColor.CGColor);
    CGContextSetAlpha(ctx, _lineOpacity);
    CGContextSetLineWidth(ctx, _lineWidth/1.2);
    CGContextMoveToPoint(ctx, tOffsetX, self.bounds.size.height/2.0);//设置Path的起点
    CGContextAddCurveToPoint(ctx, tOffsetX + tSpaceX, self.bounds.size.height/2.0 - tSpaceY,
                             tOffsetX + tSpaceX*2, self.bounds.size.height/2.0 + tSpaceY,
                             tOffsetX + tSpaceX*3, self.bounds.size.height/2.0);
    CGContextStrokePath(ctx);
}

- (void)dealloc {
    [_lineColor release];
    [super dealloc];
}

@end


@interface PDFFreehandViewController () <UIPopoverPresentationControllerDelegate>

@property (nonatomic,assign) IBOutlet UIView *contentView;
@property (nonatomic,assign) IBOutlet PDFFreehandDrawView *drawView;
@property (nonatomic,assign) IBOutlet ColorView *colorView;
@property (nonatomic,assign) IBOutlet UISlider *opacitySlider;
@property (nonatomic,assign) IBOutlet UISlider *thicknessSlider;
@property (nonatomic,assign) IBOutlet UILabel *thicknessMinLabel;
@property (nonatomic,assign) IBOutlet UILabel *thicknessMaxLabel;

@property (nonatomic,assign) IBOutlet UIButton *style1Button;
@property (nonatomic,assign) IBOutlet UIButton *style2Button;

@property (nonatomic,retain) UIView *styleSelectedView;

@end

@implementation PDFFreehandViewController

#pragma mark - Init Methods

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

#pragma mark - UIViewController Methods

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Do any additional setup after loading the view from its nib.
    _styleSelectedView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 10, 10)];
    _styleSelectedView.backgroundColor = [UIColor lightGrayColor];
    _styleSelectedView.layer.masksToBounds = YES;
    _styleSelectedView.layer.cornerRadius = 5;
    [self.view addSubview:_styleSelectedView];
    
    __block __typeof(self) blockSelf = self;
    self.colorView.callback = ^(UIColor *color) {
        blockSelf.color = color;
        [blockSelf updateView];
        if (blockSelf.callback) {
            blockSelf.callback();
        }
    };
    self.colorView.color = self.color;
    self.opacitySlider.value = self.opacity;
    
    [self updateView];
}

- (void)viewWillLayoutSubviews {
    [super viewWillLayoutSubviews];
    
    self.preferredContentSize = CGSizeMake(300, self.contentView.bounds.size.height);
    
    UIButton *button = nil;
    if (self.style == 0) {
        button = self.style1Button;
    } else if (self.style == 1) {
        button = self.style2Button;
    }
    self.styleSelectedView.center = CGPointMake(button.center.x, button.frame.origin.y-self.styleSelectedView.bounds.size.height/2.0);
}

- (void)updateView {
    self.drawView.lineColor = self.color;
    self.drawView.lineOpacity = self.opacity/100;
    self.drawView.lineWidth = self.borderWidth;
    [self.drawView setNeedsDisplay];
    
    if (self.style == 0) {
        self.thicknessSlider.minimumValue = 0.5;
        self.thicknessSlider.maximumValue = 10;
        self.thicknessMinLabel.text = @"0.5";
        self.thicknessMaxLabel.text = @"10";
    } else {
        self.thicknessSlider.minimumValue = 10;
        self.thicknessSlider.maximumValue = 30;
        self.thicknessMinLabel.text = @"10";
        self.thicknessMaxLabel.text = @"30";
    }
    self.thicknessSlider.value = self.borderWidth;
}

#pragma mark - Button Actions

- (IBAction)buttonItemClicked_Style:(UIButton *)button {
    self.style = button.tag;
    self.styleSelectedView.center = CGPointMake(button.center.x, button.frame.origin.y-self.styleSelectedView.bounds.size.height/2.0);
    [self updateView];
    if (self.callback) {
        self.callback();
    }
}

- (IBAction)sliderValueChanged_Opacity:(UISlider *)slider {
    self.opacity = slider.value;
    [self updateView];
    if (self.callback) {
        self.callback();
    }
}

- (IBAction)sliderValueChanged_BorderWidth:(UISlider *)slider {
    self.borderWidth = slider.value;
    [self updateView];
    if (self.callback) {
        self.callback();
    }
}

#pragma mark - Public Methods

- (void)showViewController:(UIViewController *)viewController inRect:(CGRect)rect {
    self.modalPresentationStyle = UIModalPresentationPopover;
    UIPopoverPresentationController *popVC = self.popoverPresentationController;
    popVC.delegate = self;
    popVC.sourceRect = rect;
    popVC.sourceView = viewController.view;
    [viewController presentViewController:self animated:YES completion:nil];
}

#pragma mark - UIPopoverPresentationControllerDelegate

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

@end