iOS富文本设置UILabel

Demo1

#//

//  ViewController.m

//  labeltext

//

//  Created by bj on 2017/9/2.

//  Copyright © 2017年 Doctor. All rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

#define UILABEL_LINE_SPACE 3

#define HEIGHT [ [ UIScreen mainScreen ] bounds ].size.height

//给UILabel设置行间距和字间距

-(void)setLabelSpace:(UILabel*)label withValue:(NSString*)str withFont:(UIFont*)font {

NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];

paraStyle.lineBreakMode = NSLineBreakByCharWrapping;

paraStyle.alignment = NSTextAlignmentLeft;

paraStyle.lineSpacing = UILABEL_LINE_SPACE; //设置行间距

paraStyle.hyphenationFactor = 1.0;

paraStyle.firstLineHeadIndent = 0.0;

paraStyle.paragraphSpacingBefore = 0.0;

paraStyle.headIndent = 0;

paraStyle.tailIndent = 0;

//设置字间距 NSKernAttributeName:@1.5f

NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f

};

NSMutableAttributedString *attributeStr = [[NSMutableAttributedString alloc] initWithString:str attributes:dic];

[attributeStr  addAttribute:NSForegroundColorAttributeName value:[UIColor  redColor] range:NSMakeRange(0, 4)];

label.attributedText = attributeStr;

}

//计算UILabel的高度(带有行间距的情况)

-(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(UIFont*)font withWidth:(CGFloat)width {

NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];

paraStyle.lineBreakMode = NSLineBreakByCharWrapping;

paraStyle.alignment = NSTextAlignmentLeft;

paraStyle.lineSpacing = UILABEL_LINE_SPACE;

paraStyle.hyphenationFactor = 1.0;

paraStyle.firstLineHeadIndent = 0.0;

paraStyle.paragraphSpacingBefore = 0.0;

paraStyle.headIndent = 0;

paraStyle.tailIndent = 0;

NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f

};

CGSize size = [str boundingRectWithSize:CGSizeMake(width, HEIGHT) options:NSStringDrawingUsesLineFragmentOrigin attributes:dic context:nil].size;

return size.height;

}

- (void)viewDidLoad {

[super viewDidLoad];

NSString * str = @"长大的寂寞第一次进入校园，遇见的便是一颗樱花树，很多学生在嬉戏打闹，很想接近他们，可，还是，没胆量。进入班级后，认识了很多人，但还是不敢主动去聊天，说话。以前，朋友之间的友谊很简单，一场游戏、一件玩具，就可能因此成为朋友。以前牵着手在瓜田里玩耍，累了，就直接躺在地上，和伙伴们说着悄悄话，看蚂蚁搬家，看蜻蜓点水……现在，有自尊心，总是害怕被拒绝，被孤立，被忽略。心里的事只能自己埋藏起来。班里会有很多的绯闻，搞得都不敢和异性接触，整天就是在忙学习，稍微有一点躲藏什么东西就会被宣传，都会被人好奇，每天和朋友也只是聊一会就继续学习。朋友很多，但很少是亲密，家长也总是不理解我们的心情，没事就是被批，和朋友的距离越来越远了……长大，好累，好寂寞。爱帮族美文网，欣赏更多美文";

UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, 100, 300, 300)];

label.backgroundColor = [UIColor  yellowColor];

label.numberOfLines = 0;

[self  setLabelSpace:label withValue:str withFont:[UIFont systemFontOfSize:17]];

CGRect  frame = label.frame;

frame.size.height = [self getSpaceLabelHeight:str withFont:[UIFont  systemFontOfSize:17] withWidth:300];

label.frame = frame;

[self.view addSubview:label];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

// Do any additional setup after loading the view, typically from a nib.

}

//富文本设置（根据NsRange  改变颜色 和 大小）

-(NSMutableAttributedString  *)changeText:(NSString *)text timeFont:(UIFont *)timeFont withTimeColor:(UIColor *)timeColor  timeRange:(NSRange )timeRange  contentFont:(UIFont *)contentFont withContentColor:(UIColor *)contentColor  contentRange:(NSRange )contentRange{

NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];

paraStyle.lineBreakMode = NSLineBreakByCharWrapping;

paraStyle.alignment = NSTextAlignmentLeft;

paraStyle.lineSpacing = UILABEL_LINE_SPACE; //设置行间距

paraStyle.hyphenationFactor = 1.0;

paraStyle.firstLineHeadIndent = 0.0;

paraStyle.paragraphSpacingBefore = 0.0;

paraStyle.headIndent = 0;

paraStyle.tailIndent = 0;

//设置字间距 NSKernAttributeName:@1.5f

NSDictionary *dic = @{NSParagraphStyleAttributeName:paraStyle, NSKernAttributeName:@1.5f

};

NSMutableAttributedString *AttributedStr = [[NSMutableAttributedString alloc]initWithString:text];

[AttributedStr addAttribute:NSFontAttributeName

value:timeFont

range:timeRange];

[AttributedStr addAttribute:NSForegroundColorAttributeName

value:timeColor

range:timeRange];

[AttributedStr  addAttribute:NSFontAttributeName

value:contentFont

range:contentRange];

[AttributedStr  addAttribute:NSForegroundColorAttributeName

value:contentColor

range:contentRange];

[AttributedStr  addAttribute:NSHTMLTextDocumentType

value:contentColor

range:contentRange];

return AttributedStr;

}

+ (CGFloat)cellDefaultHeight:(TextEntity *)entity

{

//展开后得高度(计算出文本内容的高度+固定控件的高度)

NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:17]};

NSStringDrawingOptions option = (NSStringDrawingOptions)(NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading);

NSString * timeText = @"90:90";

NSString * newContent = [[[TextListCell  alloc]init] removeHTML:entity.content];

NSString * withTime = [NSString  stringWithFormat:@"%@ %@",timeText,newContent];

CGSize size = [withTime boundingRectWithSize:CGSizeMake(kWidth - 30, 80) options:option attributes:attribute context:nil].size;

return size.height + 60;

//默认cell高度

//return 120.0;

}

+ (CGFloat)cellMoreHeight:(TextEntity *)entity

{

//展开后得高度(计算出文本内容的高度+固定控件的高度)

NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:17]};

NSStringDrawingOptions option = (NSStringDrawingOptions)(NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading);

NSString * timeText = @"90:90";

NSString * newContent = [[[TextListCell  alloc]init] removeHTML:entity.content];

NSString * withTime = [NSString  stringWithFormat:@"%@ %@",timeText,newContent];

CGSize size = [withTime boundingRectWithSize:CGSizeMake(kWidth - 30, 100000) options:option attributes:attribute context:nil].size;

return (size.height + 60) ;

}