Label中的attributedText属性,很强大的设置, 大家一起温习。

代码说话

#import "ViewController.h"
#import <CoreText/CoreText.h>

@interface ViewController ()
@end
@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 300, 260)];
    label.text = @"Label Text Content, This is a text label things attribute";//默认为空
    label.font = [UIFont systemFontOfSize:17];//默认使用系统的17
    label.textColor = [UIColor orangeColor];//默认使用文本黑色
    label.shadowColor = [UIColor lightGrayColor];//默认没有阴影
    label.shadowOffset = CGSizeMake(1,0);//默认是一个向上的阴影(0,-1)
    label.textAlignment = NSTextAlignmentCenter;//默认是左对齐
    label.lineBreakMode = NSLineBreakByTruncatingTail;//段落样式，默认是最后截断尾巴，用...代替
    
    //富文本的基本数据类型，属性字符串。以此为基础，如果这个设置了相应的属性，则会忽略上面设置的属性，默认为空
    NSString *string = label.text;
    const CGFloat fontSize = 16.0;
    NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:string];
    NSUInteger length = [string length];
    //设置字体
    UIFont *baseFont = [UIFont systemFontOfSize:fontSize];
    [attrString addAttribute:NSFontAttributeName value:baseFont range:NSMakeRange(0, length)];//设置所有的字体
    UIFont *boldFont = [UIFont boldSystemFontOfSize:fontSize];
    [attrString addAttribute:NSFontAttributeName value:boldFont range:[string rangeOfString:@"Text"]];//设置Text这四个字母的字体为粗体
    //设置倾斜，需要导入coreText
    UIFont *italicFont = GetVariationOfFontWithTrait(baseFont,
                                                     kCTFontTraitItalic);
    [attrString addAttribute:NSFontAttributeName value:italicFont
                       range:[string rangeOfString:@"Label"]];
    // 设置颜色
    UIColor *color = [UIColor redColor];
    [attrString addAttribute:NSForegroundColorAttributeName
                       value:color
                       range:[string rangeOfString:@"Content"]];
    [attrString addAttribute:NSBackgroundColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"ent"]];
    
    //可以对这些属性设置值
    //字体名称有以下：
    //abel.font = [UIFont fontWithName:@"Arial-BoldItalicMT" size:24];
    [attrString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Verdana-BoldItalic" size:18] range:[string rangeOfString:@"Label"]];
    label.numberOfLines = 2;
    NSMutableParagraphStyle *
    style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
    style.lineSpacing = 10;//增加行高
    style.headIndent = 10;//头部缩进，相当于左padding
    style.tailIndent = -10;//相当于右padding
    style.lineHeightMultiple = 1.5;//行间距是多少倍
    style.alignment = NSTextAlignmentLeft;//对齐方式
    style.firstLineHeadIndent = 20;//首行头缩进
    style.paragraphSpacing = 10;//段落后面的间距
    style.paragraphSpacingBefore = 20;//段落之前的间距
    [attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, length)];
    
    [attrString addAttribute:NSKernAttributeName value:@2 range:NSMakeRange(0, length)];//字符间距 2pt
    [attrString addAttribute:NSStrokeColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"is"]];//设置文字描边颜色，需要和NSStrokeWidthAttributeName设置描边宽度，这样就能使文字空心
    [attrString addAttribute:NSStrokeWidthAttributeName value:@2 range:[string rangeOfString:@"is"]];//空心字，文字边框描述
    [attrString addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:[string rangeOfString:@"text"]];//下划线
    [attrString addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleThick) range:[string rangeOfString:@"label"]];//厚的下划线
    [attrString addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:[string rangeOfString:@"things"]];//删除线
    [attrString addAttribute:NSStrikethroughColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"things"]];//删除线蓝色

    label.attributedText = attrString;
    label.highlightedTextColor = [UIColor redColor];//设置文本高亮显示颜色，与highlighted一起使用。
    label.highlighted = NO; //高亮状态是否打开
    label.enabled = YES;//设置文字内容是否可变
    label.userInteractionEnabled = YES;//设置标签是否忽略或移除用户交互。默认为NO
    label.baselineAdjustment = UIBaselineAdjustmentNone;//如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就来控制文本基线的行为。
    //UIBaselineAdjustmentAlignBaselines=0，默认，文本最上端与中线对齐。
    //UIBaselineAdjustmentAlignCenters,   文本中线与label中线对齐。
    //UIBaselineAdjustmentNone,  文本最低端与label中线对齐。;
    [self.view addSubview:label];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end