开发中经常有要求一段文字要有显示隔开多大的行间距，字跟字之间也要有间距，首行还要有缩进，想想也是真苛刻。那么废话不多说，下面就给大家上方法。
已封装好方法 可以加入到自己的Category
1、UILabel 设置行间距 和 字间距
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/**
* 给UILabel设置行间距和字间距
* @param space 间距
* @param text 内容
* @param font 字体
* @param zpace 字间距 --> @10 这样设置 默认的话设置 0 就ok
*/
-(void)LW_setLineSpace:(CGFloat)space withLabelText:(NSString*)text withFont:(UIFont*)font withZspace:(NSNumber *)space
{
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.lineBreakMode =NSLineBreakByCharWrapping;
paraStyle.alignment =NSTextAlignmentLeft;
paraStyle.lineSpacing = space; //设置行间距
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent =0.0;
paraStyle.paragraphSpacingBefore =0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
//设置字间距 NSKernAttributeName:@1.5f
NSDictionary *dic;
if (zpace == 0) {
dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@1.5f
};
}else {
dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:zpace
};
}
NSAttributedString *attributeStr = [[NSAttributedString alloc] initWithString:text attributes:dic];
self.attributedText = attributeStr;
}
使用方法:[label1 LW_setLineSpace:5 withLabelText:@"我是字间距为5和行间距为5的字符串哦，我是字间距为5和行间距为5的字符串哦，我是字间距为5和行间距为5的字符串哦" withFont:[UIFont systemFontOfSize:17] withZspace:@5];
那么行间距和字间距设置好之后，下面来看看计算一下设置间距后的UILabel 的高度
2、UILabel 设置行间距 和 字间距 后的高度计算
/**
* 计算UILabel的高度(带有行间距的情况)
* @param text 内容
* @param font 字体
* @param width 宽度
* @return 高度
* @param zpace 字间距 --> @10 这样设置 默认的话设置 0 就ok
*/
-(CGFloat)LW_getSpaceLabelHeight:(NSString*)text withFont:(UIFont*)font withWidth:(CGFloat)width withSpace:(CGFloat)space withZspace:(NSNumber *)zpace{
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc] init];
paraStyle.lineBreakMode =NSLineBreakByCharWrapping;
paraStyle.alignment =NSTextAlignmentLeft;
paraStyle.lineSpacing = space;
paraStyle.hyphenationFactor = 1.0;
paraStyle.firstLineHeadIndent =0.0;
paraStyle.paragraphSpacingBefore =0.0;
paraStyle.headIndent = 0;
paraStyle.tailIndent = 0;
//设置字间距 NSKernAttributeName:@1.5f
NSDictionary *dic;
if (zpace == 0) {
dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@1.5f
};
}else {
dic =@{NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:zpace
};
}
CGSize size = [text boundingRectWithSize:CGSizeMake(width,MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:dic context:nil].size;
return size.height;
}
使用方法: CGFloat height = [label1 LW_getSpaceLabelHeight:@"我是字间距为5和行间距为5的字符串哦，我是字间距为5和行间距为5的字符串哦，我是字间距为5和行间距为5的字符串哦" withFont:[UIFont systemFontOfSize:17] withWidth:LWSCREEN_WIDTH-20 withSpace:5 withZspace:@5];
3、接下来，再看看 UILabel 的首行缩进如何 缩进并且返回高度
2C666B39-AE85-40C1-9918-41042694FE3C.png
PS： 如果高度计算失败，可以提前设置下frame 不然可能会高度计算失败 label 要设置换行显示
/**
* 首行缩进 计算字符串高度
* @param text 内容
* @param indentationNum 要缩进几个字符
* @param alignment 对齐格式
* @param fontSize 字体大小
* @param width 宽度
* @return 返回高度
*/
- (CGFloat)LW_getIndentationLabelHeight:(NSString *)text withStrIndentationNum:(int)indentationNum withNSTextAlignment:(NSTextAlignment )alignment withFontSize:(CGFloat)fontSize withWidth:(CGFloat)width
{
NSMutableParagraphStyle *paraStyle01 = [[NSMutableParagraphStyle alloc] init];
paraStyle01.alignment = alignment; //对齐
paraStyle01.headIndent = 0.0f;//行首缩进
//参数：（字体大小17号字乘以2，34f即首行空出两个字符）
CGFloat emptylen = fontSize * indentationNum;
paraStyle01.firstLineHeadIndent = emptylen;//首行缩进
paraStyle01.tailIndent = 0.0f;//行尾缩进
paraStyle01.lineSpacing = 2.0f;//行间距
NSAttributedString *attrText = [[NSAttributedString alloc] initWithString:text attributes:@{NSParagraphStyleAttributeName:paraStyle01}];
self.attributedText = attrText;
CGFloat height = [self sizeThatFits:CGSizeMake([UIScreen mainScreen].bounds.size.width, CGFLOAT_MAX)].height;
return height;
}
使用方法：CGFloat height = [label1 LW_getIndentationLabelHeight:@"首行缩进并且计算字符串高度，首行缩进并且计算字符串高度，首行缩进并且计算字符串高度，首行缩进并且计算字符串高度，首行缩进并且计算字符串高度，首行缩进并且计算字符串高度" withStrIndentationNum:2 withNSTextAlignment:NSTextAlignmentLeft withFontSize:17 withWidth:LWSCREEN_WIDTH-20];
4、UILabel文字对齐
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- (void)LW_labelTextAlignment
{
NSMutableAttributedString *attributeString = [[NSMutableAttributedString alloc] initWithString:self.text];
CGSize attributeSize = [attributeString.string sizeWithAttributes:@{NSFontAttributeName:self.font}];
CGSize adjustedSize = CGSizeMake(ceilf(attributeSize.width), ceilf(attributeSize.height));
CGSize frame = self.frame.size;
NSNumber *wordSpace = [NSNumber numberWithInt:((frame.width-adjustedSize.width)/(attributeString.length-1))];
[attributeString addAttribute:NSKernAttributeName value:wordSpace range:NSMakeRange(0, attributeString.length-1)];
self.attributedText = attributeString;
}
使用方法： [label LW_labelTextAlignment];
