UILabel的使用

1.自动适配

2.设置label 的边距

    NSMutableParagraphStyle *style =  [[NSParagraphStyle defaultParagraphStyle] mutableCopy];style.alignment = NSTextAlignmentJustified;style.firstLineHeadIndent = 20.0f;style.headIndent = 10.0f;style.tailIndent = -10.0f;NSAttributedString *attrText = [[NSAttributedString alloc] initWithString:@"设置边距设置边距设置边距设置边距" attributes:@{ NSParagraphStyleAttributeName : style}];UILabel * label2 = [[UILabel alloc] initWithFrame:CGRectMake(20, 160, 200, 20)];label2.backgroundColor = [UIColor blueColor];label2.numberOfLines = 1;label2.attributedText = attrText;[self.view addSubview:label2];

3.关于限制最大宽度

设置最大宽度必须要设置为多行显示才起作用，如果要显示单行可以设置一下高度为单行高度就可以了

    UILabel* contentLabel = [[UILabel alloc]init];[self.view addSubview:contentLabel];contentLabel.numberOfLines = 0;contentLabel.backgroundColor = [UIColor blueColor];contentLabel.text = @"奔跑的兔子奔跑的兔子奔跑的兔子奔跑的兔子";//设置最大宽度必须要设置为多行显示才起作用， 如果要显示单行可以设置一下高度为单行高度就可以了contentLabel.preferredMaxLayoutWidth = 200;[contentLabel mas_makeConstraints:^(MASConstraintMaker *make) {make.left.mas_equalTo(self.view).offset(20);make.top.mas_equalTo(self.view).offset(180);}];

4.富文本的使用

    // 初始化NSMutableAttributedStringNSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] init];// 设置字体格式和大小NSString *str0 = @"设置字体格式和大小";NSDictionary *dictAttr0 = @{NSFontAttributeName:[UIFont systemFontOfSize:14]};NSAttributedString *attr0 = [[NSAttributedString alloc] initWithString:str0attributes:dictAttr0];[attributedString appendAttributedString:attr0];// 设置字体颜色NSString *str1 = @"\n设置字体颜色\n";NSDictionary *dictAttr1 = @{NSForegroundColorAttributeName:[UIColor purpleColor]};NSAttributedString *attr1 = [[NSAttributedString alloc] initWithString:str1attributes:dictAttr1];[attributedString appendAttributedString:attr1];// 设置字体背景颜色NSString *str2 = @"设置字体背景颜色\n";NSDictionary *dictAttr2 = @{NSBackgroundColorAttributeName:[UIColor cyanColor]};NSAttributedString *attr2 = [[NSAttributedString alloc] initWithString:str2attributes:dictAttr2];[attributedString appendAttributedString:attr2];/*注：NSLigatureAttributeName设置连体属性，取值为NSNumber对象（整数），1表示使用默认的连体字符，0表示不使用，2表示使用所有连体符号（iOS不支持2）。而且并非所有的字符之间都有组合符合。如 fly ，f和l会连起来。*///设置连体属性NSString *str3 = @"fly";NSDictionary *dictAttr3 = @{NSFontAttributeName:[UIFont fontWithName:@"futura" size:14],NSLigatureAttributeName:[NSNumber numberWithInteger:1]};NSAttributedString *attr3 = [[NSAttributedString alloc]initWithString:str3attributes:dictAttr3];[attributedString appendAttributedString:attr3];/*!注：NSKernAttributeName用来设置字符之间的间距，取值为NSNumber对象（整数），负值间距变窄，正值间距变宽*/NSString *str4 = @"\n设置字符间距";NSDictionary *dictAttr4 = @{NSKernAttributeName:@(4)};NSAttributedString *attr4 = [[NSAttributedString alloc]initWithString:str4attributes:dictAttr4];[attributedString appendAttributedString:attr4];/*!注：NSStrikethroughStyleAttributeName设置删除线，取值为NSNumber对象，枚举NSUnderlineStyle中的值。NSStrikethroughColorAttributeName设置删除线的颜色。并可以将Style和Pattern相互 取与 获取不同的效果*/NSString *str51 = @"\n设置删除线为细单实线,颜色为红色";NSDictionary *dictAttr51 = @{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleSingle),NSStrikethroughColorAttributeName:[UIColor redColor]};NSAttributedString *attr51 = [[NSAttributedString alloc]initWithString:str51attributes:dictAttr51];[attributedString appendAttributedString:attr51];NSString *str52 = @"\n设置删除线为粗单实线,颜色为红色";NSDictionary *dictAttr52 = @{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleThick),NSStrikethroughColorAttributeName:[UIColor redColor]};NSAttributedString *attr52 = [[NSAttributedString alloc]initWithString:str52attributes:dictAttr52];[attributedString appendAttributedString:attr52];NSString *str53 = @"\n设置删除线为细单实线,颜色为红色";NSDictionary *dictAttr53 = @{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleDouble),NSStrikethroughColorAttributeName:[UIColor redColor]};NSAttributedString *attr53 = [[NSAttributedString alloc]initWithString:str53attributes:dictAttr53];[attributedString appendAttributedString:attr53];NSString *str54 = @"\n设置删除线为细单虚线,颜色为红色";NSDictionary *dictAttr54 = @{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleSingle|NSUnderlinePatternDot),NSStrikethroughColorAttributeName:[UIColor redColor]};NSAttributedString *attr54 = [[NSAttributedString alloc]initWithString:str54attributes:dictAttr54];[attributedString appendAttributedString:attr54];/*!NSStrokeWidthAttributeName 设置笔画的宽度，取值为NSNumber对象（整数），负值填充效果，正值是中空效果。NSStrokeColorAttributeName  设置填充部分颜色，取值为UIColor对象。设置中间部分颜色可以使用 NSForegroundColorAttributeName 属性来进行*///设置笔画宽度和填充部分颜色NSString *str6 = @"设置笔画宽度和填充颜色\n";NSDictionary *dictAttr6 = @{NSStrokeWidthAttributeName:@(2),NSStrokeColorAttributeName:[UIColor blueColor]};NSAttributedString *attr6 = [[NSAttributedString alloc]initWithString:str6attributes:dictAttr6];[attributedString appendAttributedString:attr6];//设置阴影属性，取值为NSShadow对象NSString *str7 = @"设置阴影属性\n";NSShadow *shadow = [[NSShadow alloc]init];shadow.shadowColor = [UIColor redColor];shadow.shadowBlurRadius = 1.0f;shadow.shadowOffset = CGSizeMake(1, 1);NSDictionary *dictAttr7 = @{NSShadowAttributeName:shadow};NSAttributedString *attr7 = [[NSAttributedString alloc]initWithString:str7attributes:dictAttr7];[attributedString appendAttributedString:attr7];//设置文本特殊效果，取值为NSString类型，目前只有一个可用效果  NSTextEffectLetterpressStyle（凸版印刷效果）
//    NSString *str8 = @"设置特殊效果\n";
//    NSDictionary *dictAttr8 = @{NSTextEffectAttributeName:NSTextEffectLetterpressStyle};
//    NSAttributedString *attr8 = [[NSAttributedString alloc]initWithString:str8
//                                                               attributes:dictAttr8];
//    [attributedString appendAttributedString:attr8];//设置文本附件，取值为NSTextAttachment对象，常用于文字的图文混排NSString *str9 = @"文字的图文混排\n";NSTextAttachment *textAttachment = [[NSTextAttachment alloc]init];textAttachment.image = [UIImage imageNamed:@"logo"];textAttachment.bounds = CGRectMake(0, 0, 30, 30);NSDictionary *dictAttr9 = @{NSAttachmentAttributeName:textAttachment};NSAttributedString *attr9 = [[NSAttributedString alloc]initWithString:str9attributes:dictAttr9];[attributedString appendAttributedString:attr9];/*!添加下划线 NSUnderlineStyleAttributeName。设置下划线的颜色 NSUnderlineColorAttributeName，对象为 UIColor。使用方式同删除线一样。*///添加下划线NSString *str10 = @"添加下划线\n";NSDictionary *dictAttr10 = @{NSUnderlineStyleAttributeName:@(NSUnderlineStyleSingle),NSUnderlineColorAttributeName:[UIColor redColor]};NSAttributedString *attr10 = [[NSAttributedString alloc]initWithString:str10attributes:dictAttr10];[attributedString appendAttributedString:attr10];/*!NSBaselineOffsetAttributeName 设置基线偏移值。取值为NSNumber （float），正值上偏，负值下偏*///设置基线偏移值 NSBaselineOffsetAttributeNameNSString *str11 = @"添加基线偏移值\n";NSDictionary *dictAttr11 = @{NSBaselineOffsetAttributeName:@(-10)};NSAttributedString *attr11 = [[NSAttributedString alloc]initWithString:str11attributes:dictAttr11];[attributedString appendAttributedString:attr11];/*!NSObliquenessAttributeName 设置字体倾斜度，取值为 NSNumber（float），正值右倾，负值左倾*///设置字体倾斜度 NSObliquenessAttributeNameNSString *str12 = @"设置字体倾斜度\n";NSDictionary *dictAttr12 = @{NSObliquenessAttributeName:@(0.5)};NSAttributedString *attr12 = [[NSAttributedString alloc]initWithString:str12attributes:dictAttr12];[attributedString appendAttributedString:attr12];/*!NSExpansionAttributeName 设置字体的横向拉伸，取值为NSNumber （float），正值拉伸 ，负值压缩*///设置字体的横向拉伸 NSExpansionAttributeNameNSString *str13 = @"设置字体横向拉伸\n";NSDictionary *dictAttr13 = @{NSExpansionAttributeName:@(0.5)};NSAttributedString *attr13 = [[NSAttributedString alloc]initWithString:str13attributes:dictAttr13];[attributedString appendAttributedString:attr13];/*!NSWritingDirectionAttributeName 设置文字的书写方向，取值为以下组合@[@(NSWritingDirectionLeftToRight | NSWritingDirectionEmbedding)]@[@(NSWritingDirectionLeftToRight | NSWritingDirectionOverride)]@[@(NSWritingDirectionRightToLeft | NSWritingDirectionEmbedding)]@[@(NSWritingDirectionRightToLeft | NSWritingDirectionOverride)]???NSWritingDirectionEmbedding和NSWritingDirectionOverride有什么不同*///设置文字的书写方向 NSWritingDirectionAttributeNameNSString *str14 = @"设置文字书写方向\n";NSDictionary *dictAttr14 = @{NSWritingDirectionAttributeName:@[@(NSWritingDirectionRightToLeft | NSWritingDirectionEmbedding)]};NSAttributedString *attr14 = [[NSAttributedString alloc]initWithString:str14attributes:dictAttr14];[attributedString appendAttributedString:attr14];/*!NSVerticalGlyphFormAttributeName 设置文字排版方向，取值为NSNumber对象（整数），0表示横排文本，1表示竖排文本  在iOS中只支持0*///设置文字排版方向 NSVerticalGlyphFormAttributeNameNSString *str15 = @"设置文字排版方向\n";NSDictionary *dictAttr15 = @{NSVerticalGlyphFormAttributeName:@(0)};NSAttributedString *attr15 = [[NSAttributedString alloc]initWithString:str15attributes:dictAttr15];[attributedString appendAttributedString:attr15];//段落样式NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc]init];//行间距paragraph.lineSpacing = 5;//段落间距paragraph.paragraphSpacing = 5;//对齐方式paragraph.alignment = NSTextAlignmentLeft;//指定段落开始的缩进像素paragraph.firstLineHeadIndent = 30;//调整全部文字的缩进像素paragraph.headIndent = 10;//添加段落设置[attributedString addAttribute:NSParagraphStyleAttributeNamevalue:paragraphrange:NSMakeRange(0, attributedString.length)];UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(60, 100, 300, 0)];label.backgroundColor = [UIColor lightGrayColor];//自动换行label.numberOfLines = 0;//设置label的富文本label.attributedText = attributedString;//label高度自适应[label sizeToFit];[self.view addSubview:label];

5，关于sizeThatFit与sizeToFit

sizeThatFit return 'best' size to fit given size. does not actually resize view. Default is return existing view size

sizeToFit calls sizeThatFits: with current view bounds and changes bounds size.

sizeThatFits 传CGSizeZero的话得出的size 是单行的高度，宽度为全显示字符宽度

sizeThatFits: 会计算出最优的 size 但是不会改变自己的 size，而 sizeToFit: 会计算出最优的 size 而且会改变自己的 size。那么两者的联系是什么呢？

当调用 sizeToFit 后会调用 sizeThatFits 方法来计算 UIView 的 bounds.size 然后改变 frame.size。

如下代码testLabel2 的高度会自动调整

UILabel *testLabel1 = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 50, 20)];testLabel1.text = @"欢迎关注黄飞的csdn博客，这里有你想要的东西，欢迎关注！！ggg";testLabel1.font = [UIFont systemFontOfSize:14];testLabel1.textAlignment=NSTextAlignmentCenter;testLabel1.numberOfLines = 0;//使用sizeThatFit计算lable大小CGSize sizeThatFit = [testLabel1 sizeThatFits:CGSizeZero]; //(426, 17)testLabel1.frame = CGRectMake(testLabel1.frame.origin.x, testLabel1.frame.origin.y, sizeThatFit.width, sizeThatFit.height);testLabel1.textColor=[UIColor blackColor];testLabel1.backgroundColor=[UIColor yellowColor];[self.view addSubview:testLabel1];UILabel *testLabel2 = [[UILabel alloc] initWithFrame:CGRectMake(10, 200, 100, 20)];testLabel2.text = @"欢迎关注黄飞的csdn博客，这里有你想要的东西，欢迎关注！！";testLabel2.font = [UIFont systemFontOfSize:14];testLabel2.textAlignment=NSTextAlignmentCenter;testLabel2.numberOfLines = 0;[testLabel2 sizeToFit];testLabel2.textColor=[UIColor blackColor];testLabel2.backgroundColor=[UIColor yellowColor];[self.view addSubview:testLabel2];

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