//

//  BookTextView.h

//  InTheQuietNight

//

//  Created by YouXianMing on 15/5/18.

//  Copyright (c) 2015年 XianMingYou. All rights reserved.

//

#import <UIKit/UIKit.h>

#import "ExclusionView.h"

#import "ConfigAttributedString.h"

@interface BookTextView : UIView

// 要显示的文本

@property (nonatomic, strong)   NSString       *textString;

// 段落样式的设置

@property (nonatomic, strong)   NSDictionary   *paragraphAttributes;

// 富文本参数数组(ConfigAttributedString对象的数组)

@property (nonatomic, strong)   NSArray        *attributes;

// 计算出的文本的高度

@property (nonatomic, readonly) CGFloat         textHeight;

// 当前文本已读百分比

@property (nonatomic, readonly) CGFloat         currentPercent;

// 存储的图文混排的views

@property (nonatomic, strong)   NSArray        *exclusionViews;

/**

 *  构建出组件(设置完所有参数后再做)

 */

- (void)buildWidgetView;

/**

 *  移动到指定的位置(此方法只有延时执行才有效果,比如延时执行0.01s)

 *

 *  @param position 文本的高度位置

 */

- (void)moveToTextPosition:(CGFloat)position;

/**

 *  移动到指定的百分比(此方法只有延时执行才有效果,比如延时执行0.01s)

 *

 *  @param percent 百分比

 */

- (void)moveToTextPercent:(CGFloat)percent;

@end

//

//  BookTextView.m

//  InTheQuietNight

//

//  Created by YouXianMing on 15/5/18.

//  Copyright (c) 2015年 XianMingYou. All rights reserved.

//

#import "BookTextView.h"

typedef enum : NSUInteger {

    EBOOK_NONE,              // 什么也不做

    EBOOK_CALCULATE_HEIGHT,  // 计算文本高度

} EBookTextViewStatus;

@interface BookTextView ()<UITextViewDelegate> {

    EBookTextViewStatus _bookStatus;

    CGFloat             _tmpOffsetY;

    CGFloat             _tmpPercent;

}

@property (nonatomic, strong)   UITextView     *textView;

@property (nonatomic)           CGFloat         textHeight;

@property (nonatomic)           CGFloat         currentPercent;

@end

@implementation BookTextView

- (void)buildWidgetView {

    // 获取长宽

    CGFloat width  = self.frame.size.width;

    CGFloat height = self.frame.size.height;

    // 创建文本容器并设置段落样式

    NSTextStorage *storage = [[NSTextStorage alloc] initWithString:self.textString

                                                        attributes:self.paragraphAttributes];

    // 设置富文本

    for (int count = ; count < _attributes.count; count++) {

        ConfigAttributedString *oneConfig = _attributes[count];

        [storage addAttribute:oneConfig.attribute

                        value:oneConfig.value

                        range:oneConfig.range];

    }

    // 管理器

    NSLayoutManager *layoutManager = [NSLayoutManager new];

    [storage addLayoutManager:layoutManager];

    // 显示的容器

    NSTextContainer *textContainer = [NSTextContainer new];

    CGSize size                    = CGSizeMake(width, MAXFLOAT);

    textContainer.size             = size;

    [layoutManager addTextContainer:textContainer];

    // 给TextView添加带有内容和布局的容器

    self.textView = [[UITextView alloc] initWithFrame:CGRectMake(, , width, height)

                                        textContainer:textContainer];

    self.textView.scrollEnabled                    = YES;

    self.textView.editable                         = NO;

    self.textView.selectable                       = NO;

    self.textView.layer.masksToBounds              = YES;

    self.textView.showsVerticalScrollIndicator     = NO;

    self.textView.delegate                         = self;

    // 如果有额外的views

    if (self.exclusionViews) {

        NSMutableArray *pathArray = [NSMutableArray arrayWithCapacity:_exclusionViews.count];

        // 添加view + 添加path

        for (int count = ; count < _exclusionViews.count; count++) {

            // 添加view

            ExclusionView *tmpView = _exclusionViews[count];

            [_textView addSubview:tmpView];

            // 添加path

            [pathArray addObject:tmpView.createUIBezierPath];

        }

        textContainer.exclusionPaths = pathArray;

    }

    // 添加要显示的view

    [self addSubview:self.textView];

    // 存储文本高度

    [self storeBookHeight];

}

- (void)storeBookHeight {

    // 先偏移到文本末尾位置

    _bookStatus = EBOOK_CALCULATE_HEIGHT;

    [UIView setAnimationsEnabled:NO];

    [self.textView scrollRangeToVisible:NSMakeRange([self.textView.text length], )];

    [UIView setAnimationsEnabled:YES];

    _bookStatus = EBOOK_NONE;

    // 再偏移到文本开头位置

    [UIView setAnimationsEnabled:NO];

    [self.textView scrollRangeToVisible:NSMakeRange(, )];

    [UIView setAnimationsEnabled:YES];

}

- (void)moveToTextPosition:(CGFloat)position {

    [self.textView setContentOffset:CGPointMake(, position) animated:NO];

}

- (void)moveToTextPercent:(CGFloat)percent {

    // 计算出百分比

    CGFloat position = .f;

    if (percent >=  && percent <= ) {

        position = percent * _textHeight;

    } else if (percent < ) {

        position = .f;

    } else {

        position = _textHeight;

    }

    // 移动到指定的位置

    [self.textView setContentOffset:CGPointMake(, position) animated:NO];

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

    // Y轴偏移量

    _tmpOffsetY = scrollView.contentOffset.y;

    if (_bookStatus == EBOOK_NONE) {

        _tmpPercent = _tmpOffsetY / _textHeight;

        if (_tmpPercent >=  && _tmpPercent <= ) {

            _currentPercent = _tmpPercent;

        } else if (_tmpPercent < ) {

            _currentPercent = .f;

        } else {

            _currentPercent = .f;

        }

        NSLog(@"%f", _currentPercent);

    } else if (_bookStatus == EBOOK_CALCULATE_HEIGHT) {

        self.textHeight = scrollView.contentOffset.y;

    }

}

@end