一句代码搞定文字变色、字体大小改变、改变字体间距、行间距 等

需求背景

需求1: 项目中有多个收货地址, 当其中的收货地址为默认地址的时候. 如下图

需求1

需求2: 项目中金额款项字体颜色变红

需求2

这时候用两个UILbl肯定是不合适的, 需要使用富文本属性修改, 考虑到项目中这种使用场景比较多, 所以为UILbl新增一个分类.

分类

UILabel+Extension.h

/**
 * 富文本应用:  变色, 改变字体大小
 */
- (void)changeLblFont:(float)font textColor:(UIColor *)textColor range: (NSRange)range;

UILabel+Extension.m

- (void)changeLblFont:(float)font textColor:(UIColor *)textColor range: (NSRange)range{
    
    if (self.text) {
        
        // 富文本变色 NSForegroundColorAttributeName
        NSMutableAttributedString *AttributedStr = [[NSMutableAttributedString alloc]initWithString:self.text];
        [AttributedStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:font] range:range];
        [AttributedStr addAttribute:NSForegroundColorAttributeName value:textColor range:range];
        self.attributedText = AttributedStr;
    }
}

使用

• 需求一:

[self.addressLbl changeLblFont:12 textColor:kRedTextColor range:NSMakeRange(0, 6)];

• 需求二:

提交成功:
[self.successLbl changeLblFont:15 textColor:kRedTextColor range:NSMakeRange(self.successLbl.text.length - 5, 5)];

金额字体变红:
[self.promptLbl changeLblFont:12 textColor:kRedTextColor range:NSMakeRange(self.promptLbl.text.length - str.length - 1, str.length)];

拓展

考虑到项目中其他对UILbl进行的操作: 改变字体间距、改变行间距、

• .h

/**
 *  改变行间距  类方法
 */
+ (void)changeLineSpaceForLabel:(UILabel *)label WithSpace:(float)space textAlignment:(NSTextAlignment)textAlignment;

/**
 *  改变行间距
 */
- (void)changeLineSpaceForLabel:(float)space textAlignment:(NSTextAlignment)textAlignment;

/**
 *  改变字间距  类方法
 */
+ (void)changeWordSpaceForLabel:(UILabel *)label WithSpace:(float)space textAlignment:(NSTextAlignment)textAlignment;

/**
 *  改变字间距
 */
-(void)changeWordSpaceForLabel:(float)space textAlignment:(NSTextAlignment)textAlignment;

/**
 *  改变行间距和字间距  类方法
 */
+ (void)changeSpaceForLabel:(UILabel *)label withLineSpace:(float)lineSpace WordSpace:(float)wordSpace textAlignment:(NSTextAlignment)textAlignment;

/**
 *  改变行间距和字间距
 */
- (void)changeSpaceForLabel:(float)lineSpace WordSpace:(float)wordSpace textAlignment:(NSTextAlignment)textAlignment;

• .m

/**
 *  改变行间距  类方法
 */
+ (void)changeLineSpaceForLabel:(UILabel *)label WithSpace:(float)space textAlignment:(NSTextAlignment)textAlignment {
    
    if (label.text) {
        
        NSString *labelText = label.text;
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText];
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineSpacing:space];
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
        label.attributedText = attributedString;
        [label sizeToFit];
        label.textAlignment = textAlignment;
    }

}

/**
 *  改变行间距
 */
- (void)changeLineSpaceForLabel:(float)space textAlignment:(NSTextAlignment)textAlignment{
    
    if (self.text) {
        
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self.text];
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineSpacing:space];
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [self.text length])];
        self.attributedText = attributedString;
        [self sizeToFit];
        self.textAlignment = textAlignment;
    }
 
}


/**
 *  改变字间距  类方法
 */
+ (void)changeWordSpaceForLabel:(UILabel *)label WithSpace:(float)space textAlignment:(NSTextAlignment)textAlignment{
    
    if (label.text) {

        NSString *labelText = label.text;
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText attributes:@{NSKernAttributeName:@(space)}];
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
        label.attributedText = attributedString;
        [label sizeToFit];
        label.textAlignment = textAlignment;
    }
    
}

/**
 *  改变字间距
 */
-(void)changeWordSpaceForLabel:(float)space textAlignment:(NSTextAlignment)textAlignment{
    
    if (self.text) {
        
        // 取值为NSNumber对象（整数），负值间距变窄，正值间距变宽
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self.text attributes:@{NSKernAttributeName:@(space)}];
        
        self.attributedText = attributedString;
        [self sizeToFit];
        self.textAlignment = textAlignment;
    }
    
}

/**
 *  改变行间距和字间距  类方法
 */
+ (void)changeSpaceForLabel:(UILabel *)label withLineSpace:(float)lineSpace WordSpace:(float)wordSpace textAlignment:(NSTextAlignment)textAlignment{
    
    if (label.text) {
        
        NSString *labelText = label.text;
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:labelText attributes:@{NSKernAttributeName:@(wordSpace)}];
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineSpacing:lineSpace];
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [labelText length])];
        label.attributedText = attributedString;
        [label sizeToFit];
        label.textAlignment = textAlignment;
    }

}

/**
 *  改变行间距和字间距
 */
- (void)changeSpaceForLabel:(float)lineSpace WordSpace:(float)wordSpace textAlignment:(NSTextAlignment)textAlignment{
    
    if (self.text) {
        
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:self.text attributes:@{NSKernAttributeName:@(wordSpace)}];
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineSpacing:lineSpace];
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [self.text length])];
        self.attributedText = attributedString;
        [self sizeToFit];
        self.textAlignment = textAlignment;
    }
    
}