ios 设置行距和获取文本行数

设置文本行距

    UILabel *label = [[UILabel alloc] init];
    label.font = [UIFont systemFontOfSize:12];
    label.numberOfLines = 0;
    label.lineBreakMode = NSLineBreakByWordWrapping;
    label.textColor = [UIColor colorWithHexString:@"B3B3B3"];
    label.text = textDes;
    //设置行距
    NSMutableParagraphStyle *style = [NSMutableParagraphStyle new];
        style.lineSpacing  = 3;
        NSMutableDictionary *attributes  = [NSMutableDictionary dictionary];
        [attributes setObject:style forKey:NSParagraphStyleAttributeName];
    label.attributedText = [[NSAttributedString alloc] initWithString:label.text attributes:attributes];

获取文本行数

//获取文本行数
- (int)getNumberOfLinesWithText:(NSMutableAttributedString *)text andLabelWidth:(CGFloat)width {
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)text);
    CGMutablePathRef Path = CGPathCreateMutable();
    CGPathAddRect(Path, NULL ,CGRectMake(0 , 0 , width, INT_MAX));
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), Path, NULL);
    // 得到字串在frame中被自动分成了多少个行。
    CFArrayRef rows = CTFrameGetLines(frame);
    // 实际行数
    CFIndex numberOfLines = CFArrayGetCount(rows);
    CFRelease(frame);
    CGPathRelease(Path);
    CFRelease(framesetter);
    return numberOfLines;
}

使用

   //设置行距
    NSMutableParagraphStyle *style = [NSMutableParagraphStyle new];
        style.lineSpacing  = 3;
    NSMutableDictionary *attributes  = [NSMutableDictionary dictionary];
        [attributes setObject:style forKey:NSParagraphStyleAttributeName];
    //获取行数
    int nums = [self getNumberOfLinesWithText:[[NSMutableAttributedString alloc] initWithString:self.permissionDes attributes:attributes] andLabelWidth:SCREENWIDTH- 40];