PingFangSC-Semibold 和 bold字体返回的非

今天计算boundingRectWithSize 有误差,本以为PingFangSC-Semibold 和bold
是一个字体，一直算的高度有问题，后来输出下明白了，原来系统自带的字体是"SFUI-Semibold"

NSLog(@"%@字体1",[UIFont boldSystemFontOfSize:14]);
NSLog(@"%@字体2",[UIFont fontWithName:@"PingFangSC-Semibold" size:font]);

2020-01-19 15:20:31.978522+0800 IrealCare[11475:2748905] <UICTFont: 0x12630e580> font-family: ".SFUI-Semibold"; font-weight: bold; font-style: normal; font-size: 14.00pt字体1
2020-01-19 15:20:31.978835+0800 IrealCare[11475:2748905] <UICTFont: 0x12620ebf0> font-family: "PingFangSC-Semibold"; font-weight: bold; font-style: normal; font-size: 14.00pt字体2