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

//設(shè)置字體(默認(rèn)為17號(hào))
@property(null_resettable, nonatomic,strong) UIFont      *font;

//設(shè)置字體顏色(默認(rèn)黑色)
@property(null_resettable, nonatomic,strong) UIColor     *textColor;

//設(shè)置陰影顏色
@property(nullable, nonatomic,strong) UIColor            *shadowColor;

//設(shè)置陰影偏移量
@property(nonatomic)        CGSize             shadowOffset;

//設(shè)置文字對(duì)齊方式
@property(nonatomic)        NSTextAlignment    textAlignment;
/*
typedef NS_ENUM(NSInteger, NSTextAlignment) {
    NSTextAlignmentLeft      = 0,    //左對(duì)齊
    NSTextAlignmentCenter    = 1,    // 居中
    NSTextAlignmentRight     = 2,    // 右對(duì)齊
    NSTextAlignmentJustified = 3,    // 充滿View來(lái)顯示
    NSTextAlignmentNatural   = 4,    // 根據(jù)顯示的文字特性對(duì)齊
} NS_ENUM_AVAILABLE_IOS(6_0);
*/

//設(shè)置段落樣式
@property(nonatomic)        NSLineBreakMode    lineBreakMode;   // default is
/*
 typedef NS_ENUM(NSInteger, NSLineBreakMode) {
 NSLineBreakByWordWrapping = 0,     // 在字邊界處換行，默認(rèn)
 NSLineBreakByCharWrapping,         // 在字符邊界處換行
 NSLineBreakByClipping,             // 簡(jiǎn)單剪輯
 NSLineBreakByTruncatingHead,       // 截?cái)嘣谛惺?"...wxyz"
 NSLineBreakByTruncatingTail,       // 截尾在行尾:"abcd..."
 NSLineBreakByTruncatingMiddle      // 截?cái)嘈兄虚g:“ab ... yz”
 }
 */

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

//設(shè)置高亮顏色
@property(nullable, nonatomic,strong)               UIColor *highlightedTextColor;
@property(nonatomic,getter=isHighlighted) BOOL     highlighted;

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

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

//顯示行數(shù) 默認(rèn)1行
@property(nonatomic) NSInteger numberOfLines;

//設(shè)置基線
@property(nonatomic) UIBaselineAdjustment baseline;
/*
 typedef NS_ENUM(NSInteger, UIBaselineAdjustment) {
    UIBaselineAdjustmentAlignBaselines = 0, //默認(rèn)缩幸，文本最上端與中線對(duì)齊。
    UIBaselineAdjustmentAlignCenters,       //文本中線與label中線對(duì)齊肌访。
    UIBaselineAdjustmentNone,               //文本最低端與label中線對(duì)齊女气。
 };
 */

//設(shè)置字體大小適應(yīng)label寬度
@property(nonatomic) BOOL adjustsFontSizeToFitWidth;

//設(shè)置最小收縮比例
@property(nonatomic) CGFloat minimumScaleFactor;

//改變字母之間的間距來(lái)適應(yīng)Label大小
@property(nonatomic) BOOL allowsDefaultTighteningForTruncation;

// 計(jì)算UILabel隨字體多行后的高度
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines;

- (void)drawTextInRect:(CGRect)rect;

//最大約束寬
@property(nonatomic) CGFloat preferredMaxLayoutWidth;

調(diào)整Label中text的行間距

    NSString * textStr = @"這是測(cè)試UILabel行間距的text肮之。這是測(cè)試UILabel行間距的text瘤袖。\n這是測(cè)試UILabel行間距的text衣摩。\n這是測(cè)試UILabel行間距的text。這是測(cè)試UILabel行間距的text捂敌。這是測(cè)試UILabel行間距的text艾扮。這是測(cè)試UILabel行間距的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];