封装KBFont，适配字体

keyBoard/Class/Pay/V/KBVipPayHeaderView.m

@@ -195,7 +195,7 @@
         _titleLabel = [[UILabel alloc] init];
         _titleLabel.text = @"Become a member of LOVE KEY";
         _titleLabel.textColor = [UIColor colorWithHex:KBBlackValue];
-        _titleLabel.font = [UIFont systemFontOfSize:25 weight:UIFontWeightBold];
+        _titleLabel.font = [KBFont bold:18];
     }
     return _titleLabel;
 }
@@ -204,7 +204,7 @@
         _desLabel = [[UILabel alloc] init];
         _desLabel.text = @"Unlock all functions";
         _desLabel.textColor = [UIColor colorWithHex:KBBlackValue];
-        _desLabel.font = [UIFont systemFontOfSize:16 weight:UIFontWeightBold];
+        _desLabel.font = [KBFont medium:14];
     }
     return _desLabel;
 }