ios UILabel字体的行间距

#define LINESPACE 20
    
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, 320, 200)];
    [label setBackgroundColor:[UIColor blackColor]];
    [label setTextColor:[UIColor whiteColor]];
    [label setNumberOfLines:0];
    
    NSString *labelText = @"可以自己按照宽高，字体大小，来计算有多少行。。然后。。。每行画一个UILabel。。高度自己可以控制把这个写一个自定义的类。 ";
    
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText];
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

    [paragraphStyle setLineSpacing:LINESPACE];//调整行间距

    [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
    label.attributedText = attributedString;
    [self.view addSubview:label];
    [label sizeToFit]