#import "TTTAttributedLabel.h"

NSString *str = @"UILabel自定義行間距時獲取高度,UILabel自定義行間距時獲取高度,UILabel自定義行間距時獲取高度,UILabel自定義行間距時獲取高度,UILabel自定義行間距時獲取高度,UILabel自定義行間距時獲取高度,UILabel自定義行間距時獲取高度.";        //創建tttLabel    TTTAttributedLabel *tttLabel = [[TTTAttributedLabel alloc] initWithFrame:CGRectMake(30, 55, 300, 100)];    tttLabel.lineBreakMode = NSLineBreakByCharWrapping;    tttLabel.lineSpacing = 6;//設置行間距    tttLabel.font = [UIFont systemFontOfSize:12];    tttLabel.numberOfLines = 0; //設置行數為0    [tttLabel setText:str];    tttLabel.textAlignment = NSTextAlignmentLeft;    tttLabel.backgroundColor = [UIColor redColor];    [self.view addSubview:tttLabel];        //獲取tttLabel的高度    //先通過NSMutableAttributedString設置和上面tttLabel一樣的屬性,例如行間距,字體    NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:str];    //自定義str和TTTAttributedLabel一樣的行間距    NSMutableParagraphStyle *paragrapStyle = [[NSMutableParagraphStyle alloc] init];    [paragrapStyle setLineSpacing:6];    //設置行間距    [attrString addAttribute:NSParagraphStyleAttributeName value:paragrapStyle range:NSMakeRange(0, str.length)];    //設置字體    [attrString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:NSMakeRange(0, str.length)];        //得到自定義行間距的UILabel的高度    CGFloat height = [TTTAttributedLabel sizeThatFitsAttributedString:attrString withConstraints:CGSizeMake(300, MAXFLOAT) limitedToNumberOfLines:0].height;        //重新改變tttLabel的frame高度    CGRect rect = tttLabel.frame;    rect.size.height = height;    tttLabel.frame = rect;