字形参数含义

原文：http://www.docin.com/p-721844449.html

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    UIFont *font = [UIFont fontWithName:@"PingFangSC-Regular"size:15.f] ?: [UIFont systemFontOfSize:14.f];
    CGFloat ascender   = font.ascender;
    CGFloat descender  = font.descender;
    CGFloat pointSize  = font.pointSize;
    CGFloat lineHeight =  font.lineHeight;
    CGFloat capHeight  = font.capHeight;
    CGFloat xHeight = font.xHeight;
    CGFloat leading = font.leading;