Label 文字显示一行半,或者多行半

最近开发遇到这样的需求,让label显示一行半 (其实是: 当文字内容小于一行半的时候会根据全部显示,当文字内容多余一行半的时候就显示一行半,后面拼接...),如图效果

上代码: 一共有三个方法,包含控制行间距的代码

- (void)viewDidLoad {

    [superviewDidLoad];

    NSString *newStr =@"天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧天外飞鸿剧评：好剧";

    [newStr stringByTrimmingCharactersInSet:[NSCharacterSetwhitespaceAndNewlineCharacterSet]]; //去除掉首尾的空白字符和换行字符

    newStr = [newStr stringByReplacingOccurrencesOfString:@"\r"withString:@""];

    newStr = [newStr stringByReplacingOccurrencesOfString:@"\n"withString:@""];

    //创建label,WIDTH是宏定义的屏幕宽度

    UILabel *label = [[UILabelalloc] initWithFrame:CGRectMake(20,100, WIDTH-40,100)];

    label.numberOfLines =0;

    label.backgroundColor = [UIColororangeColor];

    label.textColor = [UIColorredColor];

    label.font = [UIFontsystemFontOfSize:14.0];

    label.text = newStr;

    [self.viewaddSubview:label];

    

    [label sizeToFit];

    NSString *string = [selfgetWidthWithLabel:label];

    label.text = string;

    

    [selfadjustLabelLineSpacing:label];

    

    

    

}

//核心代码控制显示一行半的方法

- (NSString *)getWidthWithLabel:(UILabel *)label{

    NSString *temp =nil;

    NSString *temp1=label.text;

    CGFloat length =0;

    for(int i =0; i < [label.textlength]; i++)

    {

        temp = [label.textsubstringWithRange:NSMakeRange(i,1)];

        // 计算宽度

        CGSize size = [tempboundingRectWithSize:CGSizeMake(MAXFLOAT,0.0) options:NSStringDrawingUsesLineFragmentOriginattributes:@{NSFontAttributeName : label.font}context:nil].size;

        

        length=length+size.width;

        // 3*label.frame.size.width  此处是三行半,根据需求设置

        if (length >= (3*label.frame.size.width + 0.5 * label.frame.size.width)) {

            temp1= [[label.textsubstringToIndex:i] stringByAppendingString:@" ..."];

            return temp1;

            

        }

    }

         return temp1;

}

//控制行间距

-(CGSize)adjustLabelLineSpacing:(UILabel *)label

{

    CGSize size =CGSizeZero;

    label.text = ((NSNull *)label.text == [NSNullnull] || label.text ==nil) ? @"" : label.text;

    NSMutableAttributedString *attributedString = [[NSMutableAttributedStringalloc]initWithString:label.text];;

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStylealloc]init];

    [paragraphStyle setLineSpacing:6];

    [attributedString addAttribute:NSParagraphStyleAttributeNamevalue:paragraphStyle range:NSMakeRange(0, label.text.length)];

    

    label.attributedText = attributedString;

    //调节高度

    size = CGSizeMake(label.frame.size.width,500000);

    

    CGSize labelSize = [labelsizeThatFits:size];

    

    CGRect rect = label.frame;

    rect.size.width = labelSize.width;

    rect.size.height = labelSize.height;

    label.frame = rect;

    

    return size;

}