label的基本用法

• 一般使用

  UILabel *label = [[UILabel alloc] init];//创建label
  label.text = @”lable text”;//赋值内容
  label.font = [UIFont systemFontOfSize:17];//设置字体大小
  label.textColor = [UIColor redColor];//设置字体颜色
  label.shadowColor = [UIColor orangeColor];//设置阴影颜色，默认没有颜色
  label.shadowColor = CGSizeMake(1,0);//设置阴影方向，默认向上（0，－1）
  label.textAlignment = NSTextAlignmentCenter;//设置居中对其，默认是左对齐
  label.lineBreakMode = NSLineBreakByTruncatingTaail；//段落样式，默认是最后截断尾巴，用…代替

• 富文本使用（如果设置富文本那么一般使用设置将忽略）

  NSSting *string = label.text;const CGFloat fontSize = 16.0;NSMutableAttributedstring *attrstring = [[NSMutableAttributedstring alloc]initWithString:string];//创建富文本NSUInteger length = [string length];//获取文本长度//设置字体UIFont *baseFont = [UIFont systemOfSize:fontSize];[attrString addAttribute:NSFontAttributeName value:baseFont range:NSMakeRange(0,lenght)];//设置所有的字体UIFont *boldFont = [UIFont boldSystemFontOfSize:fontSize];//设置粗体字体[attriString addAttribute:NSFontAttributeName value:boldFont range:[NSString rangeOfString:@"Text"]];//设置“text”为粗体UIFont *italicFont = GetVariationOfFontWithTrait(baseFont,kCTFontTraitItalic);[attrString addAttribute:NSFontAttributeName value:italicFont tange:[string rangeOfString:@"label"]];UIColor *color = [UIColr redColor];[attrString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"ent"]];//设置文字颜色[attrString addAttribute:NSBackgroundColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"ent"]];//设置背景颜色[attrString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Verdana-BoldItalic" size:18] range:[string rangeOfString:@"label"]];//设置“label”字体大小和样式label.numberOfLines = 2;//文字显示最多两行NSMutableParagraphStrle *style = [[NSParagraphStrle defaultParagraphStyle]mutableCopy];//创建段落设置style.lineSpacing = 10;//增加行高style.headIndent = 10;//头部缩紧相当于左paddingstyle.tailIndent = -10;//相当于右paddingstyle.lineHeightMultiple = 1.5;//设置行间距是1.5倍style.alignment = NSTextAlignmentLeft;//设置左对齐style.firstLineHeadIndent = 20;//首行头缩进style.paragraphSpacing = 10;//设置段落后的间距style.paragraphSpacingBefore = 20;//设置段落前的间距[attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0,length)];//为整段设置段落[attrString addAttribute:NSKernAttributeName value:@2 range:NSMakeRange(0,length)];//设置字符间距2pt[attrString addAttribute:NSStrokeColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"is"]];//设置文字描边颜色需要和NSStrokeWidthAttributeName设置描边宽度就可以实现文字空心[attrString addAttribute:NSStrokeWidthAttributeName value:@2 range:[string rangeOfString:@"is"]];//设置“is”空心字，文字边框描述[attrString addAttribute:NSUnderlineStyleAttributeName value@(NSUnderlineStyleSingle) range[string rangeOfString:@"text"]];//设置下划线[attrString addAttribute:NSUnderlineStyleAttriubuteName value@(NSUnderlineStyleThick) range:[string rangeOfString:@"lable"]];//设置厚的下划线[attrString addAttribute:NSStrikethroughStrleAttributeName value@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:[string rangeOfString:@"things"]];//设置删除线[attrString addAttribute:NSStrikethroughColorAttributeName value:@[UIColor blueColor] range:[string rangeOfString:@"things"]];//删除线蓝色label.attributeText = attrString;//赋值富文本label.highlightedTextColor = [UIColor redColor];//设置高亮显示文字，与highlighted配合使用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;//设置标签是是否忽略或移除用户交互默认为nolabel.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[self.view addSubview:label];//获取斜体UIFont *GetVariationOfFontWithTrait(UIFont *baseFont,CTFontSymblicTraits trait){    CGFloat fontSize = [baseFont pointSize];//获取点大小    CFStringRef baseFontName = (__bridge CFStringRef)[baseFont fontName];//获取字体大小    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];    CFRelase(ctFont);    CFRelase(baseCTFont);    return variantFont;//返回斜体}