問(wèn)題描述

使用NSMutableAttributedString設(shè)置不一樣字體

    int  a = 50; int b = 10;

    NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:@"10元抵現(xiàn)券"];
    [attStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:a] range:NSMakeRange(0, 2)];
    [attStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:b] range:NSMakeRange(2, attStr.length - 2)];
// [attStr addAttribute:NSBaselineOffsetAttributeName value:@(0.36 * (a - b)) range:NSMakeRange(2, attStr.length - 2)];
    label.attributedText = attStr;

文字不能居中對(duì)齊；如圖：

image.png

解決方法

NSMutableAttributedString 添加NSBaselineOffsetAttributeName這個(gè)Attribute

[attStr addAttribute:NSBaselineOffsetAttributeName value:@(0.36 * (a - b)) range:NSMakeRange(2, attStr.length - 2)];

value = 0.36 * (大字號(hào) - 小字號(hào))

    int  a = 50;
    int b = 10;

    NSMutableAttributedString *attStr = [[NSMutableAttributedString alloc] initWithString:@"10元抵現(xiàn)券"];
    [attStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:a] range:NSMakeRange(0, 2)];
    [attStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:b] range:NSMakeRange(2, attStr.length - 2)];
     [attStr addAttribute:NSBaselineOffsetAttributeName value:@(0.36 * (a - b)) range:NSMakeRange(2, attStr.length - 2)];
    label.attributedText = attStr;

image.png