分享程序员开发的那些事...
更新时间：2021-09-23 01:19:19
需求：展示信用卡标签信息，当特性标签存在多个时自动换行显示。每行特性标签信息以icon开头。
特性标签字段labelTitle
"labelTitle" : "核卡105\r\n首刷后再补贴65",
应用场景：存在图片和文字并排展示，例如特性标签
核心步骤
1、初始化NSTextAttachment对象，设置image以及布局
2、创建带有图片的富文本
原理
使用NSAttachmentAttributeName属性设置文本附件功能来插入图片使用NSTextAttachment对象
NSTextAttachment *attchment = [[NSTextAttachment alloc]init]; //设置frame,【可选】 attchment.bounds=CGRectMake(0,0,14,14); attchment.image= [UIImage imageNamed:@"icon_jinrong_dagouicon"];//设置图片
bounds 属性的y 值为负数时是向下移动，正数反之。
- NSBaselineOffsetAttributeName 基准线偏移 NSNumber
可用于调整布局
@interface NSAttributedString (NSAttributedStringAttachmentConveniences) // A convenience method for creating an attributed string containing attachment using NSAttachmentCharacter as the base character. + (NSAttributedString *)attributedStringWithAttachment:(NSTextAttachment *)attachment API_AVAILABLE(macos(10.0), ios(7.0)); @end
创建带有图片的富文本
//1.初始化NSTextAttachment对象 NSTextAttachment *attchment = [[NSTextAttachment alloc]init]; attchment.bounds=CGRectMake(0,0,14,14);//设置frame attchment.image= [UIImage imageNamed:@"icon_jinrong_dagouicon"];//设置图片 //2.创建带有图片的富文本 NSAttributedString *string = [NSAttributedString attributedStringWithAttachment:attchment];
#import <ChainAttributedString/NSMutableAttributedString+Chain.h> - (NSMutableArray *)titleArr{ NSMutableArray * tmp = [NSMutableArray arrayWithArray:[self.labelTitle componentsSeparatedByString:@"\r\n"]]; [tmp removeObject:@""]; [tmp removeObject:@" "]; // 去除数组空字符串对象小技巧：iOS 利用NSSet和array的转换，进行快速去空去重 NSSet *set = [NSSet setWithArray:tmp]; NSArray *aaa = [set allObjects]; return [NSMutableArray arrayWithArray:aaa]; } - (NSMutableAttributedString*)getDtoNSMutableAttributedString4labelTitle{ NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc]init]; for (NSString *title in self.titleArr) { NSLog(@"title:%@",title); if([NSStringQCTtoll isBlankString:title]){ continue; } //1.初始化NSTextAttachment对象 NSTextAttachment *attchment = [[NSTextAttachment alloc]init]; attchment.bounds=CGRectMake(0,0,14,14);//设置frame attchment.image= [UIImage imageNamed:@"icon_jinrong_dagouicon"];//设置图片 //2.创建带有图片的富文本 NSAttributedString *string = [NSAttributedString attributedStringWithAttachment:attchment]; [attributedString appendAttributedString:string]; attributedString.kn_addString(@" ").kn_addString(title).kn_fontColor(rgba(0, 0, 0, 1)).kn_fontSize(kPingFangFont(13)).kn_addString(@"\n"); } return attributedString; }// // [attributedString insertAttributedString:string atIndex:0];//插入到第几个下标
| 属性 | 用途 | 类型 |
| NSFontAttributeName | 字号 | UIFont 默认12 |
| NSParagraphStyleAttributeName | 段落样式 | NSParagraphStyle |
| NSForegroundColorAttributeName | 前景色 | UIColor |
| NSBackgroundColorAttributeName | 背景色 | UIColor |
| NSObliquenessAttributeName | 字体倾斜 | NSNumber |
| NSExpansionAttributeName | 字体加粗 | NSNumber 比例 0就是不变 1增加一倍 |
| NSKernAttributeName | 字间距 | CGFloat |
| NSUnderlineStyleAttributeName | 下划线 | 1或0 |
| NSUnderlineColorAttributeName | 下划线颜色 | UIColor |
| NSStrikethroughStyleAttributeName | 删除线 | 1或0 |
| NSStrikethroughColorAttributeName | 删除线颜色 | UIColor |
| NSStrokeColorAttributeName | same as ForegroundColor | UIColor |
| NSStrokeWidthAttributeName | 字体描边 | CGFloat |
| NSLigatureAttributeName | 连笔字 | 1或0 |
| NSShadowAttributeName | 阴影 | NSShawdow |
| NSTextEffectAttributeName | 设置文本特殊效果,目前只有图版印刷效果可用 | NSString |
| NSAttachmentAttributeName | 设置文本附件,常用插入图片 |
NSTextAttachment |
| NSLinkAttributeName | 链接 | NSURL (preferred) or NSString |
| NSBaselineOffsetAttributeName | 基准线偏移 |
NSNumber，可用于布局 |
| NSWritingDirectionAttributeName | 文字方向 | 分别代表不同的文字出现方向@[@(1),@(2)] |
| NSVerticalGlyphFormAttributeName | 水平或者竖直文本 | 1竖直 0水平 |
可用于调整布局
下划线的top的约束参照对象是iconImgV和tagLab两者之间的Y的较大值
- (UILabel *)lineLab{ if (nil == _lineLab) { UILabel *tmpView = [[UILabel alloc]init]; _lineLab = tmpView; [self addSubview:_lineLab]; tmpView.backgroundColor = k_tableView_Line; __weak __typeof__(self) weakSelf = self; [_lineLab mas_makeConstraints:^(MASConstraintMaker *make) { make.height.mas_equalTo(LineH); make.left.equalTo(weakSelf).offset(kAdjustRatio(10)); make.right.equalTo(weakSelf).offset(kAdjustRatio(-10)); make.bottom.equalTo(weakSelf); make.top.greaterThanOrEqualTo(weakSelf.iconImgV.mas_bottom).offset(kAdjustRatio(18)); make.top.greaterThanOrEqualTo(weakSelf.tagLab.mas_bottom).offset(kAdjustRatio(18)); }]; } return _lineLab; }
iOS富文本使用指南【持续更新中】：
1、封装富文本API，采用block实现链式编程
2、 超链接属性
3、HTML字符串与富文本互转
4、在适配系统API的应用