Support MathML Code

Support MathML Code

Author: CodingSha

MathModel.h

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+//
+//  MathModel.h
+//  test
+//
+//  Created by zkhz on 2016/12/1.
+//  Copyright © 2016年 zkhz. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+#import "MathView.h"
+@interface MathModel : NSObject
+
+/**
+    mathView
+ */
+@property (nonatomic,strong)MathView *mathView;
+
+/**
+    mathview's frame
+ */
+@property (nonatomic,assign)CGRect rect;
+@end

MathModel.m

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+//
+//  MathModel.m
+//  test
+//
+//  Created by zkhz on 2016/12/1.
+//  Copyright © 2016年 zkhz. All rights reserved.
+//
+
+#import "MathModel.h"
+
+@implementation MathModel
+@end

MathSubjectView.h

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+//
+//  MathSubjectView.h
+//  test
+//
+//  Created by zkhz on 2016/12/1.
+//  Copyright © 2016年 zkhz. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "MathView.h"
+
+@interface MathSubjectView : UIView
+@property (nonatomic,assign)MathRenderEngineType type;
+/**
+    字体
+ */
+@property (nonatomic,strong)UIFont *font;
+
+/**
+    数据源字符串
+ */
+@property (nonatomic,copy)NSString *testStr;
+- (instancetype)initWithFrame:(CGRect)frame
+                withIndexPath:(NSIndexPath *)indexPath
+         MathRenderEngineType:(MathRenderEngineType)type
+                     callBack:(void(^)(CGFloat height,NSIndexPath *IndexPath))callBack;
+@end

MathSubjectView.m

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+//
+//  MathSubjectView.m
+//  test
+//
+//  Created by zkhz on 2016/12/1.
+//  Copyright © 2016年 zkhz. All rights reserved.
+//
+
+#import "MathSubjectView.h"
+#import "YYText.h"
+#import "UIView+YYAdd.h"
+#import "MathModel.h"
+@interface MathSubjectView ()
+@property (nonatomic,strong)YYLabel *label;
+@property (nonatomic,assign)NSUInteger renderCount;
+@property (nonatomic,strong)NSIndexPath *indexPath;
+@property (nonatomic,copy)void(^callBack)(CGFloat height,NSIndexPath *indexPath);
+@end
+@implementation MathSubjectView
+
+/**
+ lazy loading
+
+ @return instance
+ */
+- (YYLabel *)label{
+    if (!_label) {
+        WS(weakSelf);
+        _label = [[YYLabel alloc]init];
+        _label.numberOfLines = 0;
+        _label.backgroundColor = [UIColor whiteColor];
+        _label.displaysAsynchronously = YES;
+        _label.ignoreCommonProperties = YES;
+        _label.textVerticalAlignment = YYTextVerticalAlignmentCenter;
+        _label.frame = CGRectMake(0, 0, weakSelf.frame.size.width, weakSelf.frame.size.height);
+    }
+    return _label;
+}
+
+/**
+ override
+
+ @param frame frame
+ @return instance
+ */
+- (instancetype)initWithFrame:(CGRect)frame withIndexPath:(NSIndexPath *)indexPath MathRenderEngineType:(MathRenderEngineType)type callBack:(void (^)(CGFloat, NSIndexPath *))callBack{
+    if (self = [super initWithFrame:frame]) {
+        self.type = type;
+        self.indexPath = indexPath;
+        self.callBack = callBack;
+        [self addSubview:self.label];
+        self.renderCount = 0;
+    }
+    return self;
+}
+
+/**
+ 处理数据源并进行渲染
+
+ @param arr 数据源
+ */
+- (void)typesetMathWithArray:(NSArray *)arr{
+    WS(weakSelf);
+    NSMutableArray *arrNew = [NSMutableArray arrayWithArray:arr];
+    for (NSInteger i = 0; i < arr.count; i ++) {
+        NSString *str = arr[i];
+        if ([str hasPrefix:@"math#"]) {
+            NSArray *arr_t = [str componentsSeparatedByString:@"#"];
+            NSData *data = [[NSData alloc]initWithBase64EncodedString:arr_t[1] options:0];
+            NSString *reStr = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
+            if (!data) {
+                reStr = arr_t[1];
+            }
+            MathModel *model = [[MathModel alloc]init];
+            MathView *math = [[MathView alloc]initWithRenderCompleted:^(CGRect frame, NSInteger index) {
+                                                    MathModel *Model = model;
+                                                          Model.rect = frame;
+                                         [arrNew replaceObjectAtIndex:index
+                                                           withObject:Model];
+                                                             weakSelf.renderCount ++;
+                                          [weakSelf typesetWithOriArr:arr
+                                                          andMultiArr:arrNew];
+            }
+                                                             withHTML:reStr
+                                                 MathRenderEngineType:self.type
+                                                                Index:i];
+            model.mathView = math;
+            math.ratio = 1.0;
+            [self addSubview:math];
+        }else if([str hasPrefix:@"image#"]){
+             NSArray *arr_m = [str componentsSeparatedByString:@"#"];
+            NSArray *urls = [arr_m[1] componentsSeparatedByString:@";"];
+            [[SDWebImageManager sharedManager] downloadImageWithURL:[NSURL URLWithString:urls[0]] options:SDWebImageLowPriority progress:^(NSInteger receivedSize, NSInteger expectedSize) {
+            } completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
+                NSUInteger imageIndex = [arr indexOfObject:[NSString stringWithFormat:@"image#%@;%@",imageURL.absoluteString,urls[1]]];
+                if (image) {
+                    [arrNew replaceObjectAtIndex:imageIndex withObject:image];
+                }else{
+                    [arrNew replaceObjectAtIndex:imageIndex withObject:@""];
+                }
+                weakSelf.renderCount ++;
+                [weakSelf typesetWithOriArr:arr andMultiArr:arrNew];
+            }];
+        }else{
+            [arrNew replaceObjectAtIndex:i withObject:str];
+            self.renderCount ++;
+            [self typesetWithOriArr:arr andMultiArr:arrNew];
+        }
+    }
+}
+
+/**
+ 解析固定协议下的数据字符串为数组
+
+ @param str 符合协议的数据字符串
+ @return 数据源数组
+ */
+- (NSArray *)parserString:(NSString *)str{
+    NSArray *arr = [str componentsSeparatedByString:@"@"];
+    NSLog(@"%@",arr);
+    NSMutableArray *newArr = [NSMutableArray arrayWithArray:arr];
+    for (NSInteger i = 0; i < newArr.count; i ++) {
+        if ([newArr[i] hasPrefix:@"/math#"]||[newArr[i] hasPrefix:@"/image#"]) {
+            NSString *newStr = [newArr[i] stringByReplacingOccurrencesOfString:@"/math#" withString:@""];
+            NSString *newStr1 = [newStr stringByReplacingOccurrencesOfString:@"/image#" withString:@""];
+            
+            [newArr replaceObjectAtIndex:i withObject:newStr1];
+        }
+    }
+    NSLog(@"%@",newArr);
+    return newArr;
+}
+
+/**
+ 渲染操作
+
+ @param arr 需要渲染的元数组
+ @param arrNew 经过数据处理的可变元数组(渲染对象)
+ */
+- (void)typesetWithOriArr:(NSArray *)arr andMultiArr:(NSMutableArray *)arrNew{
+    if (self.renderCount == arr.count) {
+        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+            //生成属性字符串
+            NSMutableAttributedString *text = [NSMutableAttributedString new];
+            
+            for (id obj in arrNew) {
+                if ([obj isKindOfClass:[NSString class]]) {
+                    NSString *atStr = (NSString *)obj;
+                    [text appendAttributedString:[[NSAttributedString alloc] initWithString:atStr]];
+                }else if ([obj isKindOfClass:[MathModel class]]){
+                    MathModel *model = (MathModel *)obj;
+                    MathView *mathView = model.mathView;
+                    CGRect rect = model.rect;
+                    [mathView sizeToFit];
+                    NSMutableAttributedString *attachText = [NSMutableAttributedString yy_attachmentStringWithContent:mathView contentMode:0 attachmentSize:rect.size alignToFont:_font alignment:1];
+                    [text appendAttributedString:attachText];
+                }else if ([obj isKindOfClass:[UIImage class]]){
+                    UIImage *image = (UIImage *)obj;
+                    NSMutableAttributedString *attachText = [NSMutableAttributedString yy_attachmentStringWithContent:image contentMode:0 attachmentSize:image.size alignToFont:_font alignment:1];
+                    [text appendAttributedString:attachText];
+                }
+            }
+            text.yy_font = _font;
+            text.yy_color = [UIColor colorWithRed:51/255.0 green:51/255.0 blue:51/255.0 alpha:1];
+            //创建文本容器
+            YYTextContainer *container = [YYTextContainer new];
+            container.size = CGSizeMake(self.width, CGFLOAT_MAX);
+            container.maximumNumberOfRows = 0;
+            //生成排版结果
+            YYTextLayout *layout = [YYTextLayout layoutWithContainer:container text:text];
+            
+            dispatch_async(dispatch_get_main_queue(), ^{
+                self.label.size = layout.textBoundingSize;
+                self.label.textLayout = layout;
+                self.callBack(self.label.height + 2,self.indexPath);
+            });
+        });
+    }
+}
+
+/**
+ 数据源字符串setter
+
+ @param testStr 数据源字符串
+ */
+- (void)setTestStr:(NSString *)testStr{
+    WS(weakSelf);
+    _testStr = testStr;
+    NSArray *arr = [weakSelf parserString:weakSelf.testStr];
+    [weakSelf typesetMathWithArray:arr];
+}
+
+@end

MathView.h

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+//
+//  MathView.h
+//  test
+//
+//  Created by zkhz on 2016/11/29.
+//  Copyright © 2016年 zkhz. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "MathWebView.h"
+@interface MathView : UIView
+
+/**
+ scale
+ */
+@property (nonatomic,assign)CGFloat ratio;
+
+
+/**
+ init
+
+ @param callBack self.Frame , element's index
+ @param code HTMLString
+ @param type MathRenderEngineType
+ @param index element's index
+ @return MathView instancetype
+ */
+- (instancetype)initWithRenderCompleted:(void(^)(CGRect frame,NSInteger index))callBack
+                               withHTML:(NSString *)code
+                   MathRenderEngineType:(MathRenderEngineType)type
+                                  Index:(NSInteger)index;
+@end