UILabel常用属性

@property(nullable, nonatomic,copy) NSString             *text;

//设置字体(默认为17号)
@property(null_resettable, nonatomic,strong) UIFont      *font;

//设置字体颜色(默认黑色)
@property(null_resettable, nonatomic,strong) UIColor     *textColor;

//设置阴影颜色
@property(nullable, nonatomic,strong) UIColor            *shadowColor;

//设置阴影偏移量
@property(nonatomic)        CGSize             shadowOffset;

//设置文字对齐方式
@property(nonatomic)        NSTextAlignment    textAlignment;
/*
typedef NS_ENUM(NSInteger, NSTextAlignment) {
    NSTextAlignmentLeft      = 0,    //左对齐
    NSTextAlignmentCenter    = 1,    // 居中
    NSTextAlignmentRight     = 2,    // 右对齐
    NSTextAlignmentJustified = 3,    // 充满View来显示
    NSTextAlignmentNatural   = 4,    // 根据显示的文字特性对齐
} NS_ENUM_AVAILABLE_IOS(6_0);
*/

//设置段落样式
@property(nonatomic)        NSLineBreakMode    lineBreakMode;   // default is
/*
 typedef NS_ENUM(NSInteger, NSLineBreakMode) {
 NSLineBreakByWordWrapping = 0,     // 在字边界处换行，默认
 NSLineBreakByCharWrapping,         // 在字符边界处换行
 NSLineBreakByClipping,             // 简单剪辑
 NSLineBreakByTruncatingHead,       // 截断在行首:"...wxyz"
 NSLineBreakByTruncatingTail,       // 截尾在行尾:"abcd..."
 NSLineBreakByTruncatingMiddle      // 截断行中间:“ab ... yz”
 }
 */

//富文本，默认nil
@property(nullable, nonatomic,copy)   NSAttributedString *attributedText;

//设置高亮颜色
@property(nullable, nonatomic,strong)               UIColor *highlightedTextColor;
@property(nonatomic,getter=isHighlighted) BOOL     highlighted;

//用户是否可交互
@property(nonatomic,getter=isUserInteractionEnabled) BOOL userInteractionEnabled;

@property(nonatomic,getter=isEnabled)                BOOL enabled;

//显示行数 默认1行
@property(nonatomic) NSInteger numberOfLines;

//设置基线
@property(nonatomic) UIBaselineAdjustment baseline;
/*
 typedef NS_ENUM(NSInteger, UIBaselineAdjustment) {
    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。
 };
 */

//设置字体大小适应label宽度
@property(nonatomic) BOOL adjustsFontSizeToFitWidth;

//设置最小收缩比例
@property(nonatomic) CGFloat minimumScaleFactor;

//改变字母之间的间距来适应Label大小
@property(nonatomic) BOOL allowsDefaultTighteningForTruncation;

// 计算UILabel随字体多行后的高度
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines;

- (void)drawTextInRect:(CGRect)rect;

//最大约束宽
@property(nonatomic) CGFloat preferredMaxLayoutWidth;

调整Label中text的行间距

    NSString * textStr = @"这是测试UILabel行间距的text。这是测试UILabel行间距的text。\n这是测试UILabel行间距的text。\n这是测试UILabel行间距的text。这是测试UILabel行间距的text。这是测试UILabel行间距的text。这是测试UILabel行间距的text。";
    UILabel * cLabel = [[UILabel alloc]initWithFrame:CGRectMake(20, 20, 280, 200)];
    cLabel.numberOfLines = 0;
    cLabel.font = [UIFont systemFontOfSize:16];
    cLabel.textColor = [UIColor grayColor];
    
    NSMutableAttributedString * attributedString1 = [[NSMutableAttributedString alloc] initWithString:textStr];
    NSMutableParagraphStyle * paragraphStyle1 = [[NSMutableParagraphStyle   alloc] init];
    [paragraphStyle1 setLineSpacing:8];
    [attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle1 range:NSMakeRange(0, [textStr length])];
    [cLabel setAttributedText:attributedString1];
    [cLabel sizeToFit];

    [self.view addSubview:cLabel];