(iOS) Support for DemiBold alias of SemiBold (font-weight 600)

Summary:
For more information on font weight naming see [this post](https://www.quora.com/What-is-the-difference-between-Medium-Demi-and-Semibold-fonts).

DemiBold is fairly common in font naming. For example, iOS React Native lacks support of "AvNext-DemiBold".

Also removed warning about `NSUInteger` <=> `NSInteger` comparison, by making `i` an `NSUInteger`

Before and after screenshots:

![before-fix](https://user-images.githubusercontent.com/177857/30182567-1dfebcb0-93cc-11e7-9b51-78ef6f41c447.png)

![after-fix](https://user-images.githubusercontent.com/177857/30182570-1f90ea94-93cc-11e7-8f68-008ae648ffbe.png)

Add any DemiBold font to an iOS react native project.  Set fontWeight to `'600'` on a `<Text />` component. The font weight should be applied appropriately.
Closes https://github.com/facebook/react-native/pull/15856

Differential Revision: D5800928

Pulled By: shergin

fbshipit-source-id: 9095e3e150847f9cb828aa5d080567846441e55d
This commit is contained in:
Sean Holbert 2017-09-08 22:48:36 -07:00 committed by Facebook Github Bot
parent 4ca617211b
commit 73c3aa8d32
1 changed files with 2 additions and 0 deletions

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@ -50,6 +50,7 @@ static RCTFontWeight weightOfFont(UIFont *font)
@"regular",
@"medium",
@"semibold",
@"demibold",
@"bold",
@"heavy",
@"black"
@ -62,6 +63,7 @@ static RCTFontWeight weightOfFont(UIFont *font)
@(UIFontWeightRegular),
@(UIFontWeightMedium),
@(UIFontWeightSemibold),
@(UIFontWeightSemibold),
@(UIFontWeightBold),
@(UIFontWeightHeavy),
@(UIFontWeightBlack)