kmpdfkit_demo/PDFViewer/Controller/CPDFTextViewController.m

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

#import "CPDFTextViewController.h"
#import "CPDFTextView.h"
#import "CPDFDataModel.h"
#import "Masonry.h"

@interface CPDFTextViewController () 

@property (nonatomic,strong) CPDFDrawView *drawView;

@end

@implementation CPDFTextViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    _textPreview = [[CPDFTextPreview alloc] init];
    _textView = [[CPDFTextView alloc] init];
    _dataModel = [[CPDFDataModel alloc] init];
    _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 initDataModel];
    [self addTargets];
    [self createGestureRecognizer];
}

- (void)initDataModel {
    _dataModel.textColor = UIColor.blackColor;
    _dataModel.watermarkOpacity = 1;
    _dataModel.text = @"Watermark";
    _dataModel.watermarkScale = 1;
    _dataModel.isTile = NO;
    _dataModel.watermarkRotation = 0;
    _textPreview.watermarkLabel.text = _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 CPDFTextViewController *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.watermarkLabel.text = strongBlock.alertController.textFields.firstObject.text;
        [strongBlock.textPreview.watermarkLabel 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];
}

#pragma mark - UI Functions

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

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

- (void)onTextScaleChanged:(UISlider *)sender {
    if (!_dataModel.isTile) {
        sender.minimumValue = 12;
        sender.maximumValue = 36;
        _textPreview.watermarkLabel.font = [_textPreview.watermarkLabel.font fontWithSize:sender.value];
        [_textPreview.watermarkLabel sizeToFit];
        [_dataModel setWatermarkScale:sender.value / 24];
    }
}

- (void)onTileSwitchChanged:(UISwitch *) sender {
    if ([sender isOn]) {
        _dataModel.isTile = YES;
        _textView.horizontalField.enabled = YES;
        _textView.verticalField.enabled = YES;
        _textView.textScaleSlider.enabled = NO;
        
        _drawView = [[CPDFDrawView alloc] initWithFrame:self.textPreview.bounds];
        _drawView.delegate = self;
        [self.view addSubview:_drawView];
        [self.textPreview bringSubviewToFront:_drawView];
        
    } else {
        _dataModel.isTile = NO;
        _textView.horizontalField.enabled = NO;
        _textView.verticalField.enabled = NO;
        _textView.textScaleSlider.enabled = YES;
        [_drawView removeFromSuperview];
    }
}

- (void)onSelectPageRange:(UIButton *)sender {
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
    UIAlertAction *defaultRange = [UIAlertAction actionWithTitle:@"All Pages" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        self.textView.rangeLabel.text = @"Page Range: ALL";
        }];
    UIAlertAction *customRange = [UIAlertAction actionWithTitle:@"Custom Page Range" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        [self createCustomRangeAlert];
        }];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            
        }];
    [alertController addAction:defaultRange];
    [alertController addAction:customRange];
    [alertController addAction:cancelAction]; 
    [self presentViewController:alertController animated:YES completion:nil];
}

- (void)createCustomRangeAlert {
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Custom Page Range" message:nil preferredStyle:UIAlertControllerStyleAlert];
    
    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"such as:1,3-5,10";
    }];
    [alertController addAction:[UIAlertAction actionWithTitle:@"Done" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        self.dataModel.pageString = alertController.textFields.firstObject.text;
        self.textView.rangeLabel.text = @"Page Range:Custom";
    }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
    }]];
    [self presentViewController:alertController animated:YES completion:nil];
}


#pragma mark - Gesture

- (void)createGestureRecognizer {
    [_textPreview.documentView setUserInteractionEnabled:YES];
    [_textPreview.watermarkLabel setUserInteractionEnabled:YES];
    [_textPreview.rotationBtn setUserInteractionEnabled:YES];
      
    UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapWatermarkLabel:)];
    [_textPreview.watermarkLabel addGestureRecognizer:tapGestureRecognizer];
    
    UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panWatermarkLabel:)];
    [_textPreview.watermarkLabel 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.watermarkLabel.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.watermarkLabel setCenter:CGPointMake(_textPreview.watermarkLabel.center.x + point.x, _textPreview.watermarkLabel.center.y + point.y)];
    [_textPreview.rotationBtn setCenter:CGPointMake(_textPreview.rotationBtn.center.x + point.x, _textPreview.rotationBtn.center.y + point.y)];
    
    if (!CGRectContainsRect(documentFrame,_textPreview.watermarkLabel.frame)) {
        [_textPreview.watermarkLabel setCenter:CGPointMake(_textPreview.watermarkLabel.center.x - point.x, _textPreview.watermarkLabel.center.y - point.y)];
        [_textPreview.rotationBtn setCenter:CGPointMake(_textPreview.rotationBtn.center.x - point.x, _textPreview.rotationBtn.center.y - point.y)];
    }
    
    _dataModel.tx = _textPreview.watermarkLabel.center.x - (_textPreview.documentView.center.x - _textPreview.documentView.frame.origin.x);
    _dataModel.ty = _textPreview.documentView.center.y - _textPreview.documentView.frame.origin.y - _textPreview.watermarkLabel.center.y;
    [recognizer setTranslation:CGPointZero inView:_textPreview.documentView];
}

- (void)rotationWatermarkLabel:(UIPanGestureRecognizer *)recognizer {
    CGPoint point = [recognizer translationInView:_textPreview];
    CGFloat radian = atan2(point.x + _textPreview.center.x - _textPreview.watermarkLabel.center.x, point.y + _textPreview.center.y - _textPreview.watermarkLabel.center.y);
    _textPreview.watermarkLabel.transform = CGAffineTransformMakeRotation(-radian);
    _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) {
        
        [_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(10);
            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);
        }];
        
    } else if ([UIDevice currentDevice].orientation == UIDeviceOrientationPortrait) {
        [_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);
        }];
        
    }
}

#pragma mark - CPDFTextPreviewDelegate

- (void)drawText:(CGContextRef)context {
    CGContextSetFillColorWithColor(context, self.textPreview.watermarkLabel.textColor.CGColor);
    CGContextSaveGState(context);
    
    CGContextClipToRect(context, self.textPreview.documentView.frame);
    
    UIFont *font = [UIFont systemFontOfSize:self.textView.textScaleSlider.value];
    NSDictionary *dic = @{NSFontAttributeName:font,NSForegroundColorAttributeName:self.textPreview.watermarkLabel.textColor};
    
    self.drawView.transform = CGAffineTransformMakeRotation((self.dataModel.watermarkRotation * M_PI) / 180);
    
    NSInteger wx,wy,height,width;
    wx = self.textPreview.watermarkLabel.frame.origin.x + self.textPreview.documentView.frame.origin.x;
    wy = self.textPreview.watermarkLabel.frame.origin.y + self.textPreview.documentView.frame.origin.y;
    height = self.textPreview.watermarkLabel.frame.size.height + 10;
    width = self.textPreview.watermarkLabel.frame.size.width + 10;

    NSInteger x,y,a,b;
    x = wx / width + (self.textPreview.frame.size.width - (wx + width)) / width + 1;
    y = wy / height + (self.textPreview.frame.size.height - (wy + height)) / height + 1;

    a = wx % width;
    b = wy % height;

    for (NSInteger i = 0; i < x; i++) {
        for (NSInteger j = 0; j < y; j++) {
            [@"watermark" drawInRect:CGRectMake(a + i * width, b + j * height, width - 10, height - 10) withAttributes:dic];
        }
    }
    
    CGContextRestoreGState(context);
    
    //self.drawView.transform = CGAffineTransformMakeRotation((self.dataModel.watermarkRotation * M_PI) / 180);
    
}

@end