kmpdfkit_demo/PDFViewer/Controller/PDFTextViewController.m

//
//  CPDFTextViewController.m
//  PDFViewer
//
//  Created by kdan on 2022/11/19.
//

#import "PDFTextViewController.h"
#import "PDFTextView.h"
#import "PDFDataModel.h"
#import "PDFDrawView.h"
#import "PDFClipView.h"
#import "Masonry.h"
#import "PDFWatermarkControllerHeader.h"

@interface PDFTextViewController () <UITextFieldDelegate>

@property (nonatomic,strong) UIAlertController *alertController;
@property (nonatomic,strong) PDFDrawView *drawView;
@property (nonatomic,strong) PDFClipView *cliView;
@property (nonatomic,assign) CGRect normalWatermarkRect;
@property (nonatomic,strong) UILabel *shadowWaterLabel;

@end

@implementation PDFTextViewController

#pragma mark - UIViewController Methods

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    _textPreview = [[PDFTextPreview alloc] init];
    _textView = [[PDFTextView alloc] init];
    
    _textView.verticalField.delegate = self;
    _textView.horizontalField.delegate = self;
    
    _alertController = [UIAlertController alertControllerWithTitle:@"Watermark Content" message:nil preferredStyle:UIAlertControllerStyleAlert];
    
    [self.view addSubview:_textPreview];
    [self.view addSubview:_textView];
    [self.view setBackgroundColor:UIColor.systemGray5Color];
    
    [self addConstraint];
    [self initWatermarkView];
    [self addTargets];
    [self createGestureRecognizer];
    
    _normalWatermarkRect = CGRectMake(69.666, 138.333, 88, 20.333);
    _shadowWaterLabel = [[UILabel alloc] initWithFrame:CGRectMake(69.666, 138.333, 88, 20.333)];
    _shadowWaterLabel.text = _textPreview.preLabel.text;
}

#pragma mark - Initializers

- (void)initDataModel {
    self.dataModel.textColor = UIColor.blackColor;
    self.dataModel.watermarkOpacity = 1;
    self.dataModel.text = @"Watermark";
    self.dataModel.watermarkScale = 17.0 / 24.0;
    self.dataModel.isTile = NO;
    self.dataModel.watermarkRotation = 0;
    self.dataModel.verticalSpacing = 100;
    self.dataModel.horizontalSpacing = 100;
}

- (void)initWatermarkView {
    _textPreview.preLabel.text = self.dataModel.text;
    _textView.horizontalField.text = 0;
    _textView.verticalField.text = 0;
    _textView.horizontalField.enabled = NO;
    _textView.verticalField.enabled = NO;
}

- (void)addConstraint {
        [_textPreview mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.view.mas_top).offset(0);
            make.width.equalTo(self.view.mas_width);
            make.bottom.equalTo(self.view.mas_bottom).offset(-205);
        }];

        [_textView mas_makeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(_textPreview.mas_bottom).offset(0);
            make.width.equalTo(_textPreview.mas_width);
            make.bottom.equalTo(self.view.mas_bottom).offset(0);
        }];
}

- (void)addTargets {
    for (NSInteger i = 0; i < _textView.colorArray.count; ++i) {
        [_textView.colorArray[i] addTarget:self action:@selector(onColorBtnClicked:) forControlEvents:UIControlEventTouchDown];
    }
    
    __block PDFTextViewController *strongBlock = self;
    [_alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        
    }];
    [_alertController addAction:[UIAlertAction actionWithTitle:@"Done" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        strongBlock.dataModel.text = strongBlock.alertController.textFields.firstObject.text;
        strongBlock.textPreview.preLabel.text = strongBlock.alertController.textFields.firstObject.text;
        [strongBlock.textPreview.preLabel sizeToFit];
        
    }]];
    [_alertController addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        strongBlock.alertController.view.hidden = YES;
    }]];
    
    [_textView.opacitySlider addTarget:self action:@selector(onOpacityChanged:) forControlEvents:UIControlEventValueChanged];
    [_textView.textScaleSlider addTarget:self action:@selector(onTextScaleChanged:) forControlEvents:UIControlEventValueChanged];
    [_textView.tileSwitch addTarget:self action:@selector(onTileSwitchChanged:) forControlEvents:UIControlEventValueChanged];
    [_textView.pageBtn addTarget:self action:@selector(onSelectPageRange:) forControlEvents:UIControlEventTouchDown];
    
    [_textView.horizontalField addTarget:self action:@selector(horizontalChange:) forControlEvents:UIControlEventEditingDidEnd];
    [_textView.verticalField addTarget:self action:@selector(verticalChage:) forControlEvents:UIControlEventEditingDidEnd];
}

#pragma mark - UI Functions

- (void)onColorBtnClicked:(UIButton *)sender {
    _textPreview.preLabel.textColor = sender.backgroundColor;
    [self.dataModel setTextColor:sender.backgroundColor];
}

- (void)onOpacityChanged:(UISlider *)sender {
    _textPreview.preLabel.alpha =  1 - sender.value;
    [self.dataModel setWatermarkOpacity:1 - sender.value];
}

- (void)onTextScaleChanged:(UISlider *)sender {
    if (!self.dataModel.isTile) {
        sender.minimumValue = 12;
        sender.maximumValue = 36;
        _textPreview.preLabel.font = [_textPreview.preLabel.font fontWithSize:sender.value];
        self.shadowWaterLabel.font = [_textPreview.preLabel.font fontWithSize:sender.value];
        self.shadowWaterLabel.center = _textPreview.preLabel.center;
        
        [_textPreview.preLabel sizeToFit];
        [self.shadowWaterLabel sizeToFit];
        
        [self.dataModel setWatermarkScale:sender.value / 24];
    }
    
    self.normalWatermarkRect = self.shadowWaterLabel.frame;
}

- (void)onTileSwitchChanged:(UISwitch *) sender {
    if ([sender isOn]) {
        self.dataModel.isTile = YES;
        _textView.horizontalField.enabled = YES;
        _textView.verticalField.enabled = YES;
        _textView.textScaleSlider.enabled = NO;
        
        self.drawView = [[PDFDrawView alloc] initWithFrame:self.textPreview.bounds];
        
        [self.drawView setDataModel:self.dataModel];
        [self.drawView setWaterLabelRect:self.normalWatermarkRect];
        [self.drawView setDocumentViewRect:self.textPreview.documentView.frame];
        
        [self.view addSubview:self.drawView];
        [self.textPreview bringSubviewToFront:self.drawView];
        
        self.cliView = [[PDFClipView alloc] initWithFrame:self.textPreview.bounds];
        [self.cliView setDocumentRect:self.textPreview.documentView.frame];
        [self.view addSubview:self.cliView];
        [self.drawView bringSubviewToFront:self.cliView];
        
    } else {
        self.dataModel.isTile = NO;
        _textView.horizontalField.enabled = NO;
        _textView.verticalField.enabled = NO;
        _textView.textScaleSlider.enabled = YES;
        
        [self.drawView removeFromSuperview];
        [self.cliView removeFromSuperview];
    }
}


- (void)horizontalChange:(UITextField *)text {
    [self.drawView setHorizontal:[text.text floatValue]];
    self.dataModel.horizontalSpacing = [text.text floatValue];
    [self.drawView setNeedsDisplay];
}

- (void)verticalChage:(UITextField *)text {
    [self.drawView setVertical:[text.text floatValue]];
    self.dataModel.verticalSpacing = [text.text floatValue];
    [self.drawView setNeedsDisplay];
}

#pragma mark - Gesture

- (void)createGestureRecognizer {
    [_textPreview.documentView setUserInteractionEnabled:YES];
    [_textPreview.preLabel setUserInteractionEnabled:YES];
    [_textPreview.rotationBtn setUserInteractionEnabled:YES];
      
    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapWatermarkLabel:)];
    [_textPreview.preLabel addGestureRecognizer:tapGestureRecognizer];
    
    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWatermarkLabel:)];
    [_textPreview.preLabel addGestureRecognizer:panRecognizer];
    
    UIPanGestureRecognizer *panRotationBtnRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(rotationWatermarkLabel:)];
    [_textPreview.rotationBtn addGestureRecognizer:panRotationBtnRecognizer];
}

- (void)tapWatermarkLabel:(UITapGestureRecognizer *)recognizer {
    _alertController.view.hidden = NO;
    _alertController.textFields.firstObject.text = _textPreview.preLabel.text;
    [self presentViewController:_alertController animated:true completion:nil];
}

- (void)panWatermarkLabel:(UIPanGestureRecognizer *)recognizer {
    CGPoint point = [recognizer translationInView:_textPreview.documentView];
    CGRect documentFrame = _textPreview.documentView.frame;
    documentFrame.origin.x -= _textPreview.documentView.frame.origin.x;
    documentFrame.origin.y -= _textPreview.documentView.frame.origin.y;
    
    [_textPreview.preLabel setCenter:CGPointMake(_textPreview.preLabel.center.x + point.x, _textPreview.preLabel.center.y + point.y)];
    [_textPreview.rotationBtn setCenter:CGPointMake(_textPreview.rotationBtn.center.x + point.x, _textPreview.rotationBtn.center.y + point.y)];
    
    if (!CGRectContainsRect(documentFrame,_textPreview.preLabel.frame)) {
        [_textPreview.preLabel setCenter:CGPointMake(_textPreview.preLabel.center.x - point.x, _textPreview.preLabel.center.y - point.y)];
        [_textPreview.rotationBtn setCenter:CGPointMake(_textPreview.rotationBtn.center.x - point.x, _textPreview.rotationBtn.center.y - point.y)];
    }
    
    self.dataModel.tx = _textPreview.preLabel.center.x - (_textPreview.documentView.center.x - _textPreview.documentView.frame.origin.x);
    self.dataModel.ty = _textPreview.documentView.center.y - _textPreview.documentView.frame.origin.y - _textPreview.preLabel.center.y;
    [recognizer setTranslation:CGPointZero inView:_textPreview.documentView];
    self.shadowWaterLabel.center = _textPreview.preLabel.center;
    
    self.normalWatermarkRect = self.shadowWaterLabel.frame;
}

- (void)rotationWatermarkLabel:(UIPanGestureRecognizer *)recognizer {
    CGPoint point = [recognizer translationInView:_textPreview];
    CGFloat radian = atan2(point.x + _textPreview.center.x - _textPreview.preLabel.center.x, point.y + _textPreview.center.y - _textPreview.preLabel.center.y);
    _textPreview.preLabel.transform = CGAffineTransformMakeRotation(-radian);
    self.dataModel.watermarkRotation = (-radian) * 180 / M_PI;
}

#pragma mark - Orientation

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
    
    if ([UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeRight || [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft) {
        [self addSideConstraint];
        
    } else if ([UIDevice currentDevice].orientation == UIDeviceOrientationPortrait) {
        [self addNormalConstraint];
    }
    
    if ([self.drawView isDescendantOfView:self.view]) {
        _textView.tileSwitch.on = NO;
        [self.cliView removeFromSuperview];
        [self.drawView removeFromSuperview];
    }
}

- (void)addSideConstraint {
    [_textView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.right.equalTo(self.view.mas_right).offset(-38);
        make.left.equalTo(_textPreview.mas_right).offset(0);
        make.height.equalTo(@205);
        make.width.equalTo(@(self.view.bounds.size.width));
        make.bottom.equalTo(self.view.mas_bottom).offset(-40);
    }];
    [_textPreview mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view.mas_top).offset(0);
        make.right.equalTo(_textView.mas_left).offset(-5);
        make.left.equalTo(self.view.mas_left).offset(0);
        make.bottom.equalTo(self.view.mas_bottom).offset(0);
    }];
    
    if ([self.drawView isDescendantOfView:self.view]) {
        [self.drawView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.view.mas_top).offset(0);
            make.right.equalTo(_textView.mas_left).offset(-5);
            make.left.equalTo(self.view.mas_left).offset(0);
            make.bottom.equalTo(self.view.mas_bottom).offset(0);
        }];
        [self.cliView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.view.mas_top).offset(0);
            make.right.equalTo(_textView.mas_left).offset(-5);
            make.left.equalTo(self.view.mas_left).offset(0);
            make.bottom.equalTo(self.view.mas_bottom).offset(0);
        }];
    }
}

- (void)addNormalConstraint {
    [_textPreview mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(self.view.mas_top).offset(0);
        make.width.equalTo(self.view.mas_width);
        make.bottom.equalTo(self.view.mas_bottom).offset(-205);
    }];
    [_textView mas_remakeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(_textPreview.mas_bottom).offset(0);
        make.width.equalTo(_textPreview.mas_width);
        make.bottom.equalTo(self.view.mas_bottom).offset(0);
    }];
    
    if ([self.drawView isDescendantOfView:self.view]) {
        [self.drawView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.view.mas_top).offset(0);
            make.width.equalTo(self.view.mas_width);
            make.bottom.equalTo(self.view.mas_bottom).offset(-205);
        }];
        [self.cliView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(self.view.mas_top).offset(0);
            make.width.equalTo(self.view.mas_width);
            make.bottom.equalTo(self.view.mas_bottom).offset(-205);
        }];
    }
}


#pragma mark - CPDFClipTextPreviewDelegate

- (void)clipText:(CGContextRef)context {
    CGContextSetFillColorWithColor(context, [UIColor systemGray5Color].CGColor);
    CGContextFillRect(context, self.textPreview.bounds);
    CGContextClearRect(context, self.textPreview.documentView.frame);
}

#pragma mark - UITextFieldDelegate

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    
    self.cliView.hidden = YES;
    self.drawView.hidden = YES;
    
    if ([UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeRight || [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft || [UIDevice currentDevice].orientation == UIDeviceOrientationPortraitUpsideDown) {
        
    } else {
        [_textView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.height.mas_equalTo(205);
            make.width.equalTo(_textPreview.mas_width);
            make.bottom.equalTo(self.view.mas_bottom).offset(-300);
        }];
        
        [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^ {
            self.textView.center = CGPointMake(self.textView.center.x, self.textView.center.y - 300);
        } completion:nil];
    }
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    
    self.cliView.hidden = NO;
    self.drawView.hidden = NO;
    
    if ([UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeRight || [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft || [UIDevice currentDevice].orientation == UIDeviceOrientationPortraitUpsideDown) {
        
    } else {
        [_textView mas_remakeConstraints:^(MASConstraintMaker *make) {
            make.top.equalTo(_textPreview.mas_bottom).offset(0);
            make.width.equalTo(_textPreview.mas_width);
            make.bottom.equalTo(self.view.mas_bottom).offset(0);
            make.height.mas_equalTo(205);
        }];
        
        [UIView animateWithDuration:0.3 delay:0 options:UIViewAnimationOptionCurveEaseIn animations:^ {
            self.textView.center = CGPointMake(self.textView.center.x, self.textView.center.y + 300);
        } completion:nil];
    }
    
    return YES;
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if (_textView.horizontalField == textField || _textView.verticalField == textField) {
        return [self validateValue:string];
    }
    
    return YES;
}

@end