NSString如何获取字符串中的数字 NSAttributedString如何计算富文本字符串的宽高

- (void)_setAttributedString:(NSString *)string label:(UILabel *)label {
    
    string = @"剩余3天";
    
    NSCharacterSet* nonDigits =[[NSCharacterSet decimalDigitCharacterSet] invertedSet];
    int num =[[string stringByTrimmingCharactersInSet:nonDigits] intValue];
    UIColor *numColor;
    // 如果就剩1天了 这个数字就显示为红色
    if (num == 1) {
        numColor = [UIColor hexStringToColor:@"f45d01"];
    }
    // 否则这个数字就显示黑色
    else {
        numColor = [UIColor hexStringToColor:@"666666"];
    }
    NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc] initWithString:string];
    // 剩余
    [attributedStr addAttributes:@{NSFontAttributeName:FONT(14), NSForegroundColorAttributeName:
[UIColor hexStringToColor:@"bababa"]} 
range:NSMakeRange(0, 2)];
    // 具体多少天
    [attributedStr addAttributes:@{NSFontAttributeName:FONT(48), NSForegroundColorAttributeName:
numColor} 
range:NSMakeRange(2, attributedStr.length - 3)];
    // 天
    [attributedStr addAttributes:@{NSFontAttributeName:FONT(14), NSForegroundColorAttributeName:
[UIColor hexStringToColor:@"666666"]} 
range:NSMakeRange(attributedStr.length - 1, 1)];
    label.attributedText = attributedStr;
    
    CGRect rectBeforeFit = label.frame;
    [label sizeToFit];
    CGRect rectAfterFit = label.frame;
    CGFloat deltaXPlus = rectBeforeFit.size.width - rectAfterFit.size.width;
    rectAfterFit.origin.x += deltaXPlus;
    label.frame = rectAfterFit;
    
}

注意：如何获取字符串的数字

NSCharacterSet* nonDigits =[[NSCharacterSet decimalDigitCharacterSet] invertedSet];
    int num =[[string stringByTrimmingCharactersInSet:nonDigits] intValue];

注意：如何计算attributedString的宽高

    CGRect rectBeforeFit = label.frame;
    [label sizeToFit];
    CGRect rectAfterFit = label.frame;