特别实用而且功能强大的attributedText属性

#import "ViewController.h"#import <CoreText/CoreText.h>@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];//设置字体    UIButton *btn=[[UIButton alloc]init];    NSMutableDictionary *btndict=[NSMutableDictionary dictionary];    btndict[NSFontAttributeName]=[UIFont systemFontOfSize:15];    [btn setTitleTextAttributes:btndict forState:UIControlStateNormal];//设置删除线    UITextField *textfield=[[UITextField alloc]init];    textfield.text=@"试试";    NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:textfield.text];    [attrString addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(0, textfield.text.length)];    [textfield setAttributedText:attrString];     1.控件 UIView UILabel UITextField UITextView UIButton     2.字体、大小、单位、颜色     */    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：//    label.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]; } UIFont * GetVariationOfFontWithTrait(UIFont *baseFont,                                     CTFontSymbolicTraits trait) {    CGFloat fontSize = [baseFont pointSize];    CFStringRef    baseFontName = (__bridge CFStringRef)[baseFont fontName];    CTFontRef baseCTFont = CTFontCreateWithName(baseFontName,                                                fontSize, NULL);    CTFontRef ctFont =    CTFontCreateCopyWithSymbolicTraits(baseCTFont, 0, NULL,                                       trait, trait);    NSString *variantFontName =    CFBridgingRelease(CTFontCopyName(ctFont,                                     kCTFontPostScriptNameKey));    UIFont *variantFont = [UIFont fontWithName:variantFontName                                          size:fontSize];    CFRelease(ctFont);    CFRelease(baseCTFont);    return variantFont;};- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end