YYXC_Student/jiaPei/Modules/OtherModules/ExerciseModule/ViewModel/RQExerciseQuestionItemViewModel.m

//
//  RQExerciseQuestionItemViewModel.m
//  SDJK
//
//  Created by 张嵘 on 2021/8/16.
//

#import "RQExerciseQuestionItemViewModel.h"

@interface RQExerciseQuestionItemViewModel ()
@property (nonatomic, readwrite, strong) NSString *typeString;
@property (nonatomic, readwrite, strong) NSMutableAttributedString *qusetionString;
@property (nonatomic, readwrite, strong) NSString *imageString;
@property (nonatomic, readwrite, strong) NSString *videoString;

@end

@implementation RQExerciseQuestionItemViewModel
- (instancetype)initWithRQExerciseModel:(RQExerciseModel *)exerciseModel {
    if (self = [super init]) {
        if ([exerciseModel.answer containsString:@"-"]) {
            self.typeString = @"多选题";
        } else if ([exerciseModel.answer containsString:@"√"] || [exerciseModel.answer containsString:@"×"]) {
            self.typeString = @"判断题";
        } else {
            self.typeString = @"单选题";
        }
        
        NSString *questionStr = [NSString stringWithFormat:@"%ld、%@",(long)exerciseModel.num + 1,exerciseModel.issue];
        self.qusetionString = [[NSMutableAttributedString alloc] initWithString:questionStr];
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setFirstLineHeadIndent:58];//首行缩进
        [paragraphStyle setLineSpacing:10];//调整行间距
        [_qusetionString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [questionStr length])];
        
        if (RQStringIsNotEmpty(exerciseModel.titlekeyword) && exerciseModel.isShowSkillExplanation) {
            [[[exerciseModel.titlekeyword componentsSeparatedByString:@"-"].rac_sequence.signal deliverOnMainThread] subscribeNext:^(NSString * _Nullable skillkeywordStr) {
                NSRange targetRange = NSMakeRange(0, questionStr.length);
                NSRange range = targetRange;
                while (true) {
                    range = [questionStr rangeOfString:skillkeywordStr options:NSLiteralSearch range:targetRange];
                    
                    if (range.location != NSNotFound) {
                        NSRange newRange = NSMakeRange(range.location - 1, range.length + 2);
                        if (newRange.length + newRange.location > range.location + range.length) {
                            NSInteger a = (newRange.length + newRange.location) - (range.location + range.length);
                            newRange = NSMakeRange(newRange.location - a, newRange.length);
                        }
                        NSString *keywordStr = [questionStr substringWithRange:newRange];
                        if ([keywordStr containsString:@"“"] || [keywordStr containsString:@"”"] || [keywordStr containsString:@"\""]) {
                            range = newRange;
                        }
                        targetRange = NSMakeRange(NSMaxRange(range), questionStr.length-NSMaxRange(range));
                        
                        [_qusetionString addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:19] range:range];
                        [_qusetionString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17] range:targetRange];
                        [_qusetionString addAttribute:NSForegroundColorAttributeName value:RQ_MAIN_TEXT_COLOR_RED range:range];
                        
                    } else {
                        break;
                    }
                }
                
            } completed:^{
//                CGRect rect = [_qusetionString.string boundingRectWithSize:CGSizeMake(RQ_SCREEN_WIDTH - (16 * 2), MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:19],NSParagraphStyleAttributeName:paragraphStyle} context:nil];
//                self.imageString = exerciseModel.image;
//                self.videoString = @"";
//
//                if (RQStringIsEmpty(_imageString)) {
//                    self.rowHeight = rect.size.height + (16 * 2);
//                } else {
//                    self.rowHeight = rect.size.height + (RQ_SCREEN_WIDTH - 32) * 0.4 + (16 * 3);
//                }
                NSMutableAttributedString *caculateStr = [[NSMutableAttributedString alloc] initWithAttributedString:_qusetionString];
                [caculateStr appendAttributedString:[[NSMutableAttributedString alloc] initWithString:_typeString]];
                CGFloat yyHeight = [caculateStr.string  heightForFont:[UIFont boldSystemFontOfSize:17] width:RQ_SCREEN_WIDTH - (16 * 2)];
                NSInteger lineNum  = [self needLinesWithText:caculateStr.string width:RQ_SCREEN_WIDTH - (16 * 2)];
                CGFloat labelHeight = yyHeight + (lineNum > 1? lineNum - 1 : 0) * 10;
                self.imageString = exerciseModel.image;
                self.videoString = @"";
                
                if (RQStringIsEmpty(_imageString)) {
                    self.rowHeight = labelHeight + (16 * 2);
                } else {
                    self.rowHeight = labelHeight + (RQ_SCREEN_WIDTH - 32) * 0.4 + (16 * 3);
                }
            }];

        } else {
            NSMutableAttributedString *caculateStr = [[NSMutableAttributedString alloc] initWithAttributedString:_qusetionString];
            [caculateStr appendAttributedString:[[NSMutableAttributedString alloc] initWithString:_typeString]];
            CGFloat yyHeight = [caculateStr.string  heightForFont:[UIFont boldSystemFontOfSize:17] width:RQ_SCREEN_WIDTH - (16 * 2)];
            NSInteger lineNum  = [self needLinesWithText:caculateStr.string width:RQ_SCREEN_WIDTH - (16 * 2)];
            CGFloat labelHeight = yyHeight + (lineNum > 1? lineNum - 1 : 0) * 10;
            self.imageString = exerciseModel.image;
            self.videoString = @"";
            
            if (RQStringIsEmpty(_imageString)) {
                self.rowHeight = labelHeight + (16 * 2);
            } else {
                self.rowHeight = labelHeight + (RQ_SCREEN_WIDTH - 32) * 0.4 + (16 * 3);
            }
        }
        
        
    }
    return self;
}

/**
 显示当前文字需要几行

 @param width 给定一个宽度
 @return 返回行数
 */
- (NSInteger)needLinesWithText:(NSString *)textStr width:(CGFloat)width {
    //创建一个labe
    UILabel * label = [[UILabel alloc]init];
    //font和当前label保持一致
    label.font = [UIFont boldSystemFontOfSize:17];
    NSString * text = textStr;
    NSInteger sum = 0;
    //总行数受换行符影响，所以这里计算总行数，需要用换行符分隔这段文字，然后计算每段文字的行数，相加即是总行数。
    NSArray * splitText = [text componentsSeparatedByString:@"\n"];
    for (NSString * sText in splitText) {
        label.text = sText;
        //获取这段文字一行需要的size
        CGSize textSize = [label systemLayoutSizeFittingSize:CGSizeZero];
        //size.width/所需要的width 向上取整就是这段文字占的行数
        NSInteger lines = ceilf(textSize.width/width);
        //当是0的时候，说明这是换行，需要按一行算。
        lines = lines == 0?1:lines;
        sum += lines;
    }
    return sum;
}
@end