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];