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//
// GMHighlightLabel.m
// Gengmei
//
// Created by wangyang on 6/11/15.
// Copyright (c) 2015 Wanmeichuangyi. All rights reserved.
//
#import "GMHighlightLabel.h"
#import "GMFont.h"
#import <Constant.h>
#import <UIColor+GMTheme.h>
@implementation GMHighlightLabel
- (void)setOriginalHightlightText:(NSString *)originalHightlightText{
_originalHightlightText = originalHightlightText;
if (_originalHightlightText.length == 0) {
self.attributedText = nil;
return;
}
if (!_hightlightColor) {
_hightlightColor = [UIColor mainVisual];
}
if (!_normalColor) {
_normalColor = [UIColor bodyText];
}
NSMutableAttributedString *attString = [self parseString:_originalHightlightText];
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
style.lineSpacing = _lineHeight;
style.lineBreakMode = NSLineBreakByTruncatingTail;
style.alignment = _aligment;
// 如果有高亮，attString不为空，那只加一个NSParagraphStyleAttributeName属性
if (self.lineHeight > 0 && attString.length > 0) {
[attString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, attString.length)];
}
// 如果没有走到正则里面，说明没有需要高亮的内容，设置普通颜色就好
else if (attString.length == 0) {
NSAttributedString *subString = [[NSAttributedString alloc] initWithString:_originalHightlightText attributes:@{NSFontAttributeName : self.font, NSForegroundColorAttributeName:_normalColor, NSParagraphStyleAttributeName:style}];
[attString appendAttributedString:subString];
}
self.attributedText = attString;
}
- (NSMutableAttributedString *)parseString:(NSString *)originalString{
NSError *error;
NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:@"([\\w\\W]*)<ems>([\\w\\W]+)<\\/ems>([\\w\\W]*)" options:0 error:&error];
if (error) {
self.attributedText = nil;
}
NSMutableAttributedString *attString = [[NSMutableAttributedString alloc] init];
[expression enumerateMatchesInString:originalString options:0 range:NSMakeRange(0, originalString.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
// 根据NSTextCheckingResult的rangeAtIndex方法文档，result至少会有一个range，这个range是匹配它自身全部的，所以正则匹配的其它range是从1开始的
// <ems></ems>将string分隔为string1, string2, string3，分别对应前中后
NSString *string1 = [originalString substringWithRange:[result rangeAtIndex:1]];
NSAttributedString *attrString1 = [self parseString:string1];
if (attrString1.length > 0) {
[attString appendAttributedString:attrString1];
}else{
NSAttributedString *subString = [[NSAttributedString alloc] initWithString:string1 attributes:@{NSFontAttributeName : self.font, NSForegroundColorAttributeName:_normalColor}];
[attString appendAttributedString:subString];
}
NSString *string2 = [originalString substringWithRange:[result rangeAtIndex:2]];
NSAttributedString *attrString2 = [self parseString:string2];
if (attrString2.length > 0) {
[attString appendAttributedString:attrString2];
}else{
if (self.hightlightFont != nil) {
NSAttributedString *subString = [[NSAttributedString alloc] initWithString:string2 attributes:@{NSFontAttributeName : self.hightlightFont, NSForegroundColorAttributeName:_hightlightColor}];
[attString appendAttributedString:subString];
} else {
NSAttributedString *subString = [[NSAttributedString alloc] initWithString:string2 attributes:@{NSFontAttributeName : self.font, NSForegroundColorAttributeName:_hightlightColor}];
[attString appendAttributedString:subString];
}
}
NSString *string3 = [originalString substringWithRange:[result rangeAtIndex:3]];
NSAttributedString *attrString3 = [self parseString:string3];
if (attrString3.length > 0) {
[attString appendAttributedString:attrString3];
}else{
NSAttributedString *subString = [[NSAttributedString alloc] initWithString:string3 attributes:@{NSFontAttributeName : self.font, NSForegroundColorAttributeName:_normalColor}];
[attString appendAttributedString:subString];
}
}];
return attString;
}
+ (GMHighlightLabel *)hightLabelTextColor:(UIColor *)color andFont:(CGFloat)font {
GMHighlightLabel *label = [[GMHighlightLabel alloc] init];
label.backgroundColor = UIColor.whiteColor;
label.textColor = color;
label.font = [UIFont gmFont:font];
label.hightlightColor = [UIColor mainVisual];
label.hightlightFont = [UIFont gmBoldFont:font];
return label;
}
@end