NSMutableAttributedString(富文本)的简单使用

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(, , self.view.frame.size.width-, self.view.frame.size.height--)];

    label.text = @"春种一粒粟，秋成万颗子。\n四海无闲田，农夫犹饿死。\n锄禾日当午，汗滴禾下土。\n谁知盘中餐，粒粒皆辛苦。";

    [self.view addSubview:label];

    NSRange rangeOne = [label.text rangeOfString:@"春种一粒粟"];

    NSRange rangeTwo = [label.text rangeOfString:@"秋成万颗子"];

    NSRange rangeThree = [label.text rangeOfString:@"四海无闲田"];

    NSRange rangeFour = [label.text rangeOfString:@"农夫犹饿死"];

    NSRange rangeFive = [label.text rangeOfString:@"锄禾日当午"];

    NSRange rangeSix = [label.text rangeOfString:@"汗滴禾下土"];

    NSRange rangeSeven = [label.text rangeOfString:@"谁知盘中餐"];

    NSRange rangeEight = [label.text rangeOfString:@"粒粒皆辛苦"];

    NSMutableAttributedString *attributedLabel = [[NSMutableAttributedString alloc] initWithString:label.text];

    //字体

    [attributedLabel addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:] range:NSMakeRange(, label.text.length)];

    //段落

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

    paragraphStyle.lineSpacing = ; //行间距

    paragraphStyle.alignment = NSTextAlignmentCenter;

    [attributedLabel addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(, label.text.length)];

    //字体颜色

    [attributedLabel addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(rangeOne.location, rangeOne.length)];

    //字体底色

    [attributedLabel addAttribute:NSBackgroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(rangeTwo.location, rangeTwo.length)];

    //删除线

    [attributedLabel addAttribute:NSStrikethroughStyleAttributeName value:[NSNumber numberWithInt:] range:NSMakeRange(rangeThree.location, rangeThree.length)];

    [attributedLabel addAttribute:NSStrikethroughColorAttributeName value:[UIColor redColor] range:NSMakeRange(rangeThree.location, rangeThree.length)];

    //下划线

    [attributedLabel addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInt:] range:NSMakeRange(rangeFour.location, rangeFour.length)];

    [attributedLabel addAttribute:NSUnderlineColorAttributeName value:[UIColor redColor] range:NSMakeRange(rangeFour.location, rangeFour.length)];

    //文字间距

    [attributedLabel addAttribute:NSKernAttributeName value:[NSNumber numberWithInt:] range:NSMakeRange(rangeFive.location, rangeFive.length)];

    //字体倾斜(正值右倾，负值左倾)

    [attributedLabel addAttribute:NSObliquenessAttributeName value:[NSNumber numberWithFloat:0.5] range:NSMakeRange(rangeSix.location, rangeSix.length)];

    //笔画宽度(正值中空，负值填充)

    [attributedLabel addAttribute:NSStrokeWidthAttributeName value:[NSNumber numberWithFloat:] range:NSMakeRange(rangeSeven.location, rangeSeven.length)];

    //填充颜色

    [attributedLabel addAttribute:NSStrokeColorAttributeName value:[UIColor redColor] range:NSMakeRange(rangeSeven.location, rangeSeven.length)];

    //阴影效果

    NSShadow *shadow = [[NSShadow alloc] init];

    shadow.shadowColor = [UIColor redColor];

    shadow.shadowOffset = CGSizeMake(, );

    shadow.shadowBlurRadius = ;

    [attributedLabel addAttribute:NSShadowAttributeName value:shadow range:NSMakeRange(rangeEight.location, rangeEight.length)];

    //自适应高

    label.numberOfLines = ;

    CGRect labelStringRect = [attributedLabel boundingRectWithSize:CGSizeMake(self.view.frame.size.width-label.frame.origin.x*, ) options:NSStringDrawingUsesLineFragmentOrigin context:nil];

    CGRect labelRect = label.frame;

    labelRect.size.height = labelStringRect.size.height;

    label.frame = labelRect;

    label.attributedText = attributedLabel;

}

效果图如下：