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用相同的代碼顯示不同的字符順序的NSMutableAttributedString，會導致行高和字號的BUG。

▲●■▲●■▲●■*asdf
●▲■▲●■▲●■*asdf
■●■▲●■▲●■*asdf

最后兩行是僅第一個字符和僅○設置Attributes，可以看出會影響后面沒有設置的字符

code

    NSMutableAttributedString *symbol = [[NSMutableAttributedString alloc] initWithString:@"●▲■▲●■▲●■*asdf"];
    UIFont *symbolFont = [UIFont systemFontOfSize:24.0];
    UIColor *stripesPurple = [UIColor colorWithRed:0.83 green:0.64 blue:0.83 alpha:1];
    
    
    [symbol addAttributes:@{NSForegroundColorAttributeName:[UIColor purpleColor],
                            NSFontAttributeName:symbolFont,
                            NSStrokeWidthAttributeName:@-4,
                            NSStrokeColorAttributeName:[UIColor purpleColor]}
                    range:NSMakeRange(0, 3)];
    [symbol addAttributes:@{NSForegroundColorAttributeName:stripesPurple,
                            NSFontAttributeName:symbolFont,
                            NSStrokeWidthAttributeName:@-4,
                            NSStrokeColorAttributeName:[UIColor purpleColor]}
                    range:NSMakeRange(3, 3)];
    [symbol addAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor],
                            NSFontAttributeName:symbolFont,
                            NSStrokeWidthAttributeName:@-4,
                            NSStrokeColorAttributeName:[UIColor purpleColor]}
                    range:NSMakeRange(6, 3)];
    //[self.myTextView setAttributedText:symbol];
    [self.attrLabel setAttributedText:symbol];