iOS UILabel自訂行間距時擷取高度，iosuilabel

iOS UILabel自訂行間距時擷取高度，iosuilabel

本文介紹一下自訂行間距的UILabel的高度如何擷取,需要藉助一下開源的UILabel控制項:TTTAttributedLabel

附 https://github.com/TTTAttributedLabel/TTTAttributedLabel 

下載後,添加到工程裡面,匯入標頭檔

　#import "TTTAttributedLabel.h"

直接上代碼

NSString *str = @"UILabel自訂行間距時擷取高度,UILabel自訂行間距時擷取高度,UILabel自訂行間距時擷取高度,UILabel自訂行間距時擷取高度,UILabel自訂行間距時擷取高度,UILabel自訂行間距時擷取高度,UILabel自訂行間距時擷取高度.";        //建立tttLabel    TTTAttributedLabel *tttLabel = [[TTTAttributedLabel alloc] initWithFrame:CGRectMake(30, 55, 300, 100)];    tttLabel.lineBreakMode = NSLineBreakByCharWrapping;    tttLabel.lineSpacing = 6;//設定行間距    tttLabel.font = [UIFont systemFontOfSize:12];    tttLabel.numberOfLines = 0; //設定行數為0    [tttLabel setText:str];    tttLabel.textAlignment = NSTextAlignmentLeft;    tttLabel.backgroundColor = [UIColor redColor];    [self.view addSubview:tttLabel];        //擷取tttLabel的高度    //先通過NSMutableAttributedString設定和上面tttLabel一樣的屬性,例如行間距,字型    NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:str];    //自訂str和TTTAttributedLabel一樣的行間距    NSMutableParagraphStyle *paragrapStyle = [[NSMutableParagraphStyle alloc] init];    [paragrapStyle setLineSpacing:6];    //設定行間距    [attrString addAttribute:NSParagraphStyleAttributeName value:paragrapStyle range:NSMakeRange(0, str.length)];    //設定字型    [attrString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:12] range:NSMakeRange(0, str.length)];        //得到自訂行間距的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;