UILabel封装——生成富文本，计算文本高度，图文混排

YWLabel

项目中富文本的展示非常普遍，若通过UILable的接口方法去设置是非常繁琐麻烦的，另外，文本动态高度计算的问题也很常见，因此有必要对UILabel进行封装。以便我们处理这两个问题，下面这个YWLabel主要就针对这两个问题进行了封装，给开发提供方便，提高效率。

// YWLabel.h#import <UIKit/UIKit.h>@interface YWLabel : UILabel- (void)labelText:(NSString *)text      lineSpacing:(CGFloat)l_spacing;- (void)labelText:(NSString *)text   sectionSpacing:(CGFloat)s_spacing      lineSpacing:(CGFloat)l_spacing;+ (NSAttributedString *)attributedTextArray:(NSArray *)texts                                 textColors:(NSArray *)colors                                 textfonts:(NSArray *)fonts;+ (NSAttributedString *)attributedTextArray:(NSArray *)texts                                 textColors:(NSArray *)colors                                 textfonts:(NSArray *)fonts                                lineSpacing:(CGFloat)l_spacing;+ (CGSize)sizeLabelWidth:(CGFloat)width          attributedText:(NSAttributedString *)attributted;+ (CGSize)sizeLabelWidth:(CGFloat)width                    text:(NSString *)text                    font:(UIFont *)font;+ (CGSize)sizeLabelWidth:(CGFloat)width                    text:(NSString *)text                    font:(UIFont *)font             lineSpacing:(CGFloat)l_spacing;@end
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// YWLabel.m#import "YWLabel.h"@implementation YWLabel- (instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if(self)    {        self.backgroundColor = [UIColor whiteColor];    }    return self;}- (void)labelText:(NSString *)text      lineSpacing:(CGFloat)l_spacing{    if(l_spacing<0){        self.text = text;        return;    }    self.numberOfLines = 0;    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:text];    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];    paragraphStyle.lineSpacing = l_spacing;    [attributedStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, text.length)];    [attributedStr addAttribute:NSForegroundColorAttributeName value:self.textColor range:NSMakeRange(0, text.length)];    [attributedStr addAttribute:NSFontAttributeName value:self.font range:NSMakeRange(0, text.length)];    self.attributedText = attributedStr;}- (void)labelText:(NSString *)text   sectionSpacing:(CGFloat)s_spacing      lineSpacing:(CGFloat)l_spacing{    if(s_spacing<=0 && l_spacing<=0){        self.text = text;        return;    }    self.numberOfLines = 0;    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:text];    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];    paragraphStyle.lineSpacing = l_spacing; // lineSpacing    paragraphStyle.paragraphSpacing = s_spacing; // paragraphSpacing    [attributedStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, text.length)];    [attributedStr addAttribute:NSForegroundColorAttributeName value:self.textColor range:NSMakeRange(0, text.length)];    [attributedStr addAttribute:NSFontAttributeName value:self.font range:NSMakeRange(0, text.length)];    self.attributedText = attributedStr;}+ (NSAttributedString *)attributedTextArray:(NSArray *)texts                                 textColors:(NSArray *)colors                                  textfonts:(NSArray *)fonts{    if(texts.count == 0){        return nil;    }    NSMutableAttributedString *resultAttributedStr = [[NSMutableAttributedString alloc] init];    for(int i=0; i<texts.count; i++)    {        NSString *text = texts[i];        NSMutableAttributedString *mAttributedStr = [[NSMutableAttributedString alloc] initWithString:text];        [mAttributedStr addAttribute:NSForegroundColorAttributeName value:colors[i] range:NSMakeRange(0, text.length)];        [mAttributedStr addAttribute:NSFontAttributeName value:fonts[i] range:NSMakeRange(0, text.length)];        [resultAttributedStr appendAttributedString:mAttributedStr];    }    return resultAttributedStr;}+ (NSAttributedString *)attributedTextArray:(NSArray *)texts                                 textColors:(NSArray *)colors                                  textfonts:(NSArray *)fonts                                lineSpacing:(CGFloat)l_spacing{    if(texts.count == 0){        return nil;    }    NSMutableAttributedString *resultAttributedStr = [[NSMutableAttributedString alloc] init];    for(int i=0; i<texts.count; i++)    {        NSString *text = texts[i];        NSMutableAttributedString *mAttributedStr = [[NSMutableAttributedString alloc] initWithString:text];        [mAttributedStr addAttribute:NSForegroundColorAttributeName value:colors[i] range:NSMakeRange(0, text.length)];        [mAttributedStr addAttribute:NSFontAttributeName value:fonts[i] range:NSMakeRange(0, text.length)];        [resultAttributedStr appendAttributedString:mAttributedStr];    }    if(l_spacing>0){        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];        paragraphStyle.lineSpacing = l_spacing;        [resultAttributedStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, resultAttributedStr.length)];    }    return resultAttributedStr;}+ (CGSize)sizeLabelWidth:(CGFloat)width          attributedText:(NSAttributedString *)attributted{    if(width<=0){        return CGSizeZero;    }    UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, 1000)];    lab.attributedText = attributted;    lab.numberOfLines = 0;    CGSize labSize = [lab sizeThatFits:lab.bounds.size];    return labSize;}+ (CGSize)sizeLabelWidth:(CGFloat)width                    text:(NSString *)text                    font:(UIFont *)font{    if(width<=0 || text.length == 0){        return CGSizeZero;    }    UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, 1000)];    lab.text = text;    if(font){        lab.font = font;    }    CGSize labSize = [lab sizeThatFits:lab.bounds.size];    return labSize;}+ (CGSize)sizeLabelWidth:(CGFloat)width                    text:(NSString *)text                    font:(UIFont *)font             lineSpacing:(CGFloat)l_spacing{    if(width<=0 || text.length == 0){        return CGSizeZero;    }    if(l_spacing<=0){        UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, 1000)];        lab.text = text;        lab.numberOfLines = 0;        if(font){            lab.font = font;        }        CGSize labSize = [lab sizeThatFits:lab.bounds.size];        return labSize;    }    else    {        UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, 1000)];        lab.numberOfLines = 0;        if(font){            lab.font = font;        }        NSMutableAttributedString *mAttriStr = [[NSMutableAttributedString alloc] initWithString:text];        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];        paragraphStyle.lineSpacing = l_spacing;        [mAttriStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, text.length)];        lab.attributedText = mAttriStr;        CGSize labSize = [lab sizeThatFits:lab.bounds.size];        return labSize;    }}@end
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上面就是我们封装的YWLabel，下面我们来测试一下：

// ViewController.m#import "ViewController.h"#import "YWLabel.h"#define Lab_W self.view.bounds.size.width-30.f#define FONT(X) [UIFont systemFontOfSize:X]#define BFONT(X) [UIFont boldSystemFontOfSize:X]@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor lightGrayColor];    NSArray *textsArray = @[@"你呀别总想搞个大新闻!",                            @"图样图森破!",                            @"什么大风大浪我没见过",                            @"我和华莱士谈笑风生"];    NSArray *colorsArray = @[[UIColor orangeColor],                             [UIColor redColor],                             [UIColor blueColor],                             [UIColor greenColor]];    NSArray *fontsArray = @[FONT(20), BFONT(35), FONT(25), BFONT(30)];    YWLabel *lab = [[YWLabel alloc] initWithFrame:CGRectMake(15.f, 80.f, Lab_W, 10)];    lab.numberOfLines = 0;    // 生成富文本字符串    NSAttributedString *attributeStr = [YWLabel attributedTextArray:textsArray                                                         textColors:colorsArray                                                          textfonts:fontsArray                                                        lineSpacing:20.f];    lab.attributedText = attributeStr;    // 计算富文本的高度    CGFloat lab_h = [YWLabel sizeLabelWidth:Lab_W                             attributedText:attributeStr].height;    lab.frame = CGRectMake(15.f, 80.f, Lab_W, lab_h);    [self.view addSubview:lab];}@end
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效果图：

UILabel+ImageTextFix

——UILabel+ImageTextFix.h——

#import <UIKit/UIKit.h>@interface UILabel (ImageTextFix)// 由多个attributedString拼接成新的attributedString，item意为由text或image生成的单个attributedString+ (NSAttributedString *)fixAttributeStrWithItems:(NSArray *)items;// + (NSAttributedString *)fixAttributedStrWithTexts:(NSArray *)texts                                textColors:(NSArray *)colors                                 textfonts:(NSArray *)fonts                                     image:(UIImage *)image                               insertIndex:(NSInteger)index                               lineSpacing:(CGFloat)l_spacing;+ (NSAttributedString *)fixAttributedStrWithTexts:(NSArray *)texts                                       textColors:(NSArray *)colors                                        textfonts:(NSArray *)fonts                                            image:(UIImage *)image                                      insertIndex:(NSInteger)index                                      imageBounds:(CGRect)bounds                                      lineSpacing:(CGFloat)l_spacing;// 由text生成attributedString+ (NSAttributedString *)attributedStrWithText:(NSString *)text textColor:(UIColor *)color textFont:(UIFont *)font;// 由image生成attributedString+ (NSAttributedString *)attributedStrWithImage:(UIImage *)image imageBounds:(CGRect)bounds;@end
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——UILabel+ImageTextFix.m——

#import "UILabel+ImageTextFix.h"@implementation UILabel (ImageTextFix)// 由多个attributedString拼接成新的attributedString，item意为由text或image生成的单个attributedString+ (NSAttributedString *)fixAttributeStrWithItems:(NSArray *)items{    NSMutableAttributedString *resultMAttrStr = [[NSMutableAttributedString alloc] init];    for(int i=0; i<items.count; i++)    {        if([items[i] isKindOfClass:[NSAttributedString class]]){            [resultMAttrStr appendAttributedString:items[i]];        }    }    return resultMAttrStr;}// 图文混合，只有一张图片+ (NSAttributedString *)fixAttributedStrWithTexts:(NSArray *)texts                                       textColors:(NSArray *)colors                                        textfonts:(NSArray *)fonts                                            image:(UIImage *)image                                      insertIndex:(NSInteger)index                                      lineSpacing:(CGFloat)l_spacing{    return [[self class] fixAttributedStrWithTexts:texts                                        textColors:colors                                         textfonts:fonts                                             image:image                                       insertIndex:index                                       imageBounds:CGRectZero                                       lineSpacing:l_spacing];}// 同上，多了一个l_spacing参数+ (NSAttributedString *)fixAttributedStrWithTexts:(NSArray *)texts                                       textColors:(NSArray *)colors                                        textfonts:(NSArray *)fonts                                            image:(UIImage *)image                                      insertIndex:(NSInteger)index                                      imageBounds:(CGRect)bounds                                      lineSpacing:(CGFloat)l_spacing{    if(texts.count==0){        return nil;    }    NSMutableAttributedString *resultAttrStr = [[NSMutableAttributedString alloc] init];    NSInteger locationIndex = 0;    for(int i=0; i<texts.count; i++)    {        NSString *text = texts[i];        NSAttributedString *tempMAttrStr = [[self class] attributedStrWithText:texts[i] textColor:colors[i] textFont:fonts[i]];        [resultAttrStr appendAttributedString:tempMAttrStr];        // 计算图片应该插入的位置        if(index<=texts.count){            if(index == 0){                locationIndex = 0;            }            else{                if(i<index){                    locationIndex+=text.length;                }            }        }    }    if(l_spacing>0){        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];        paragraphStyle.lineSpacing = l_spacing;        [resultAttrStr addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, resultAttrStr.length)];    }    // 插入图片附件（插入图片要在最后，不然会有影响）    NSMutableAttributedString *resultAttrStr1 = [[self class] insertMAttrStr:resultAttrStr image:image imageBounds:bounds insertIndex:locationIndex];    return resultAttrStr1;}+ (NSMutableAttributedString *)insertMAttrStr:(NSMutableAttributedString *)mAttrStr image:(UIImage *)image imageBounds:(CGRect)bounds insertIndex:(NSInteger)index{    if(image){        NSTextAttachment *attachment = [[NSTextAttachment alloc] init];        attachment.image = image;        attachment.bounds = CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.width, bounds.size.height);        NSAttributedString *attachmentAttrStr = [NSAttributedString attributedStringWithAttachment:attachment];        [mAttrStr insertAttributedString:attachmentAttrStr atIndex:index];    }    return [mAttrStr copy];}// 由text生成attributedString+ (NSAttributedString *)attributedStrWithText:(NSString *)text textColor:(UIColor *)color textFont:(UIFont *)font{    NSMutableAttributedString *mAttrStr = [[NSMutableAttributedString alloc] initWithString:text];    [mAttrStr addAttribute:NSForegroundColorAttributeName value:color range:NSMakeRange(0, text.length)];    [mAttrStr addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, text.length)];    return mAttrStr;}// 由image生成attributedString+ (NSAttributedString *)attributedStrWithImage:(UIImage *)image imageBounds:(CGRect)bounds{    NSTextAttachment *attachment = [[NSTextAttachment alloc] init];    attachment.image = image;    attachment.bounds = CGRectMake(bounds.origin.x, bounds.origin.y, bounds.size.width, bounds.size.height);    NSAttributedString *attachmentAttrStr = [NSAttributedString attributedStringWithAttachment:attachment];    return attachmentAttrStr;}@end
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——使用——

方式1：

// 数据初始化    UIImage *icon = [UIImage imageNamed:@"biaoji-dacuxiao"];    NSArray *texts = @[@"大起飞精品钢琴课程 ",@"买买买!!!",@"1200元 "];    NSArray *colors = @[[UIColor lightGrayColor],[UIColor orangeColor],[UIColor redColor]];    NSArray *fonts = @[[UIFont systemFontOfSize:15],[UIFont systemFontOfSize:15],[UIFont systemFontOfSize:25]];    UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(15.f, 550.f, self.view.bounds.size.width-30.f, 80.f)];    [self.view addSubview:lab];    lab.numberOfLines = 0;    // ----1----图文混合，只有一张图片    lab.attributedText = [UILabel fixAttributedStrWithTexts:texts                                                 textColors:colors                                                  textfonts:fonts                                                      image:icon                                                   insertIndex:3                                                   imageBounds:CGRectMake(0, 5.f, icon.size.width, icon.size.height)                                                   lineSpacing:5.f];
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方式二：

 UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(15.f, 550.f, self.view.bounds.size.width-30.f, 80.f)];    [self.view addSubview:lab];    lab.numberOfLines = 0;    // ----2----由多个attributedString拼接成新的attributedString    NSAttributedString *attrStr1 = [UILabel attributedStrWithText:@"大中华精品钢琴课程 " textColor:[UIColor lightGrayColor] textFont:[UIFont systemFontOfSize:15]];    NSAttributedString *attrStr2 = [UILabel attributedStrWithImage:icon imageBounds:CGRectMake(0, 5.f, icon.size.width, icon.size.height)];    NSAttributedString *attrStr3 = [UILabel attributedStrWithText:@"1200元 " textColor:[UIColor redColor] textFont:[UIFont systemFontOfSize:25]];    NSAttributedString *attrStr4 = [UILabel attributedStrWithText:@"买买买" textColor:[UIColor orangeColor] textFont:[UIFont systemFontOfSize:15]];    NSAttributedString *attrStr5 = [UILabel attributedStrWithImage:icon imageBounds:CGRectMake(0, -15.f, icon.size.width, icon.size.height)];    NSAttributedString *resultAttrStr = [UILabel fixAttributeStrWithItems:@[attrStr1,attrStr2,attrStr3,attrStr4,attrStr5]];    lab.attributedText = resultAttrStr;