简易使用UILabel的富文本
使用效果:
源码:
NSString+YX.h NSString+YX.m
// // NSString+YX.h // YXKit // // Copyright (c) 2014年 Y.X. All rights reserved. // #import <Foundation/Foundation.h> #import "ConfigAttributedString.h" @interface NSString (YX) // 创建富文本并配置富文本(NSArray中的数据必须是ConfigAttributedString对象合集) - (NSMutableAttributedString *)createAttributedStringAndConfig:(NSArray *)configs; // 用于搜寻一段字符串在另外一段字符串中的NSRange值 - (NSRange)rangeFrom:(NSString *)string; // 本字符串的range - (NSRange)range; @end
// // NSString+YX.m // YXKit // // Copyright (c) 2014年 Y.X. All rights reserved. // #import "NSString+YX.h" @implementation NSString (YX) - (NSMutableAttributedString *)createAttributedStringAndConfig:(NSArray *)configs { NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self]; [configs enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { ConfigAttributedString *oneConfig = obj; [attributedString addAttribute:oneConfig.attribute value:oneConfig.value range:oneConfig.range]; }]; return attributedString; } - (NSRange)rangeFrom:(NSString *)string { return [string rangeOfString:self]; } - (NSRange)range { return NSMakeRange(0, self.length); } @end
ConfigAttributedString.h ConfigAttributedString.m
// // ConfigAttributedString.h // NSMutableAttributedString // // Copyright (c) 2014年 Y.X. All rights reserved. // #import <Foundation/Foundation.h> @interface ConfigAttributedString : NSObject @property (nonatomic, strong, readonly) NSString *attribute; // 富文本属性 @property (nonatomic, strong, readonly) id value; // 富文本值 @property (nonatomic, assign, readonly) NSRange range; // 富文本范围值 // 通用型配置 + (instancetype)attribute:(NSString *)attribute value:(id)value range:(NSRange)range; // 配置字体 + (instancetype)font:(UIFont *)font range:(NSRange)range; // 配置字体颜色 + (instancetype)foregroundColor:(UIColor *)color range:(NSRange)range; // 配置字体背景颜色 + (instancetype)backgroundColor:(UIColor *)color range:(NSRange)range; // 字体描边颜色以及描边宽度以及阴影(以下两个方法可以一起使用) + (instancetype)strokeColor:(UIColor *)color range:(NSRange)range; + (instancetype)strokeWidth:(float)number range:(NSRange)range; + (instancetype)shadow:(NSShadow *)shadow range:(NSRange)range; // 配置文字的中划线 + (instancetype)strikethroughStyle:(NSInteger)number range:(NSRange)range; // 配置文字的下划线 + (instancetype)underlineStyle:(NSInteger)number range:(NSRange)range; // 字间距 + (instancetype)kern:(float)number range:(NSRange)range; // 段落样式(需要将UILabel中的numberOfLines设置成0才有用) + (instancetype)paragraphStyle:(NSMutableParagraphStyle *)style range:(NSRange)range; @end
// // ConfigAttributedString.m // NSMutableAttributedString // // Copyright (c) 2014年 Y.X. All rights reserved. // #import "ConfigAttributedString.h" @interface ConfigAttributedString () @property (nonatomic, strong) NSString *attribute; @property (nonatomic, strong) id value; @property (nonatomic, assign) NSRange range; @end @implementation ConfigAttributedString + (instancetype)attribute:(NSString *)attribute value:(id)value range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = attribute; config.value = value; config.range = range; return config; } + (instancetype)font:(UIFont *)font range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSFontAttributeName; config.value = font; config.range = range; return config; } + (instancetype)foregroundColor:(UIColor *)color range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSForegroundColorAttributeName; config.value = color; config.range = range; return config; } + (instancetype)backgroundColor:(UIColor *)color range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSBackgroundColorAttributeName; config.value = color; config.range = range; return config; } + (instancetype)strikethroughStyle:(NSInteger)number range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSStrikethroughStyleAttributeName; config.value = [NSNumber numberWithInteger:number]; config.range = range; return config; } + (instancetype)paragraphStyle:(NSMutableParagraphStyle *)style range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSParagraphStyleAttributeName; config.value = style; config.range = range; return config; } + (instancetype)kern:(float)number range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSKernAttributeName; config.value = [NSNumber numberWithFloat:number]; config.range = range; return config; } + (instancetype)underlineStyle:(NSInteger)number range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSUnderlineStyleAttributeName; config.value = [NSNumber numberWithInteger:number]; config.range = range; return config; } + (instancetype)strokeColor:(UIColor *)color range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSStrokeColorAttributeName; config.value = color; config.range = range; return config; } + (instancetype)strokeWidth:(float)number range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSStrokeWidthAttributeName; config.value = [NSNumber numberWithFloat:number]; config.range = range; return config; } + (instancetype)shadow:(NSShadow *)shadow range:(NSRange)range { ConfigAttributedString *config = [self new]; config.attribute = NSShadowAttributeName; config.value = shadow; config.range = range; return config; } @end
控制器源码:
// // RootViewController.m // RichText // // Copyright (c) 2014年 Y.X. All rights reserved. // #import "RootViewController.h" #import "NSString+YX.h" @interface RootViewController () @end @implementation RootViewController - (void)viewDidLoad { [super viewDidLoad]; // 字符串 NSString *str = @"未选择的路-弗罗斯特 黄色的树林里分出两条路， 可惜我不能同时去涉足， 我在那路口久久伫立， 我向着一条路极目望去， 直到它消失在丛林深处。 但我却选了另外一条路， 它荒草萋萋，十分幽寂， 显得更诱人、更美丽， 虽然在这两条小路上， 都很少留下旅人的足迹， 虽然那天清晨落叶满地， 两条路都未经脚印污染。 啊，留下一条路等改日再见！ 但我知道路径延绵无尽头， 恐怕我难以再回返。 也许多少年后在某个地方， 我将轻声叹息把往事回顾， 一片树林里分出两条路， 而我选了人迹更少的一条， 从此决定了我一生的道路。"; // 设置组 NSArray *array = @[// 全局设置 [ConfigAttributedString font:[UIFont systemFontOfSize:10.f] range:[str range]], [ConfigAttributedString paragraphStyle:[self style] range:[str range]], // 局部设置 [ConfigAttributedString foregroundColor:[UIColor redColor] range:[@"未选择的路" rangeFrom:str]], [ConfigAttributedString font:[UIFont systemFontOfSize:20.f] range:[@"未选择的路" rangeFrom:str]]]; // 初始化富文本 UILabel *label = [[UILabel alloc] initWithFrame:self.view.bounds]; label.numberOfLines = 0; label.attributedText = [str createAttributedStringAndConfig:array]; [self.view addSubview:label]; } // 段落样式 - (NSMutableParagraphStyle *)style { NSMutableParagraphStyle *style = [NSMutableParagraphStyle new]; style.lineSpacing = 10.f; style.firstLineHeadIndent = 10.f; return style; } @end
设计原理:
我把配置抽象成了一个对象,一个对象可能对应着不同的配置,这样写起来就不会乱
使用的时候直接就在数组中配置
通过NSString的Category直接生成富文本赋值给attributedText即完成了富文本的操作
这才叫面向对象编程嘛:)