Update the visual appearance of an entire application in minutes
Save themes for use in multiple applications
Set the styles of UI elements using simple rules, like setting Button { border-color: #CCCCCC; }
Define variables like @primaryFontName or @myBackgroundColor (a la Sass/LESS)
Avoid digging through documentation to find how to change specific UI elements' styling
Quickly create custom style classes
Modify an application's styling while it is running
Some exciting features are on the horizon, and contributions are very encouraged. Please see the FAQ.
Installation
CocoaPods
NUI is most easily installed using CocoaPods. Its pod name is "NUI". After installing it, add [NUISettings init]; to application:didFinishLaunchingWithOptions in AppDelegate.m (like this).
When installed as a framework, NUI can be natively imported in Swift. Just add
import NUI to the top of your file.
Without CocoaPods
If you choose not to use CocoaPods, you can install NUI with these steps:
Copy the NUI directory into your application
Add the CoreImage and QuartzCore frameworks to your application if you haven't already (like this)
Add NUIParse as a subproject, set its iOSNUIParse target as a dependency of your target, and add libNUIParse.a to your linked libraries.
Add [NUISettings init]; to application:didFinishLaunchingWithOptions in AppDelegate.m (like this)
To use NUI in Swift add #import <NUI/NUISettings.h> to your bridging header.
The Demo uses CocoaPods, so you'll want to install CocoaPods, run pod install in the Demo directory, and then open the .xcworkspace to open the project.
After dropping in NUI, you can modify your app's styling by simply editing NUIStyle.nss. If you want to avoid modifying NUI's files, you can copy NUIStyle.nss into your app, rename it (e.g. MyTheme.nss), then replace [NUISettings init] with [NUISettings initWithStylesheet:@"MyTheme"]; (step 4 in Installation).
Due to the nature of UIKit's usage of simple UI components within more complex UI components, NUI doesn't style some UIKit components in some very rare cases. If you ever need to apply styling for these cases, you can simply use NUIRenderer:
[NUIRenderer renderButton:myButton];
This will use the 'Button' style. You can also specify a custom class:
N.B. NUI used to require that you make your elements inherit from a NUI class, but this is no longer the case. See "Migrating From Subclasses To Categories" below for details.
Editing The Style Rules
NUIStyle.nss contains all of the style rules. A rule like Button { font-name: Helvetica; } modifies the font name of every UIButton, for example.
The format should be self-explanatory, but here are some notes:
Styling variables are defined at the top, but they can be added/modified/removed as you see fit.
You can make an element inherit from multiple style classes (see Creating Custom Style Classes below).
To see all of the available properties and values, see the Style Classes and Style Value Types lists below.
Creating Custom Style Classes
You can give elements custom style classes (e.g. LargeButton), and make those classes inherit from one or more other style classes by using the form Button:LargeButton. To bypass NUI's styling for a particular element, set the class to none. You can set an element's style class either in Interface Builder or programmatically:
Setting an Element's Style Class in Interface Builder
To do this, you'll set a runtime attribute for the element (in Identity Inspector > User Defined Runtime Attributes, click +). Set the Key Path to nuiClass, Type to String, and Value to LargeButton (or Button:MyButton:
Setting an Element's Style Class Programmatically
To do this, you'll want to import the NUI category for the element. If you're styling a UIButton, you'd import:
#import"UIButton+NUI.h"
You can then set nuiClass on your element:
myButton.nuiClass = @"LargeButton";
N.B. A style class can inherit from an indefinite number of style rules, so if you want to create groups of style rules, you can set nuiClass to something like @"MyStyleGroup1:MyStyleGroup2:MyButton".
Excluding Views from NUI's Styling
If you want to prevent specific view classes from being styled (e.g. third party UI elements that are already styled), you can specify these in NSS:
exclude-views will prevent NUI from applying the Button style to views of the specified classes
exclude-subviews will prevent NUI from applying the `Button style to subviews of views of the specified classes
If you want to globally prevent specific view classes from being styled (regardless of style class), you can do this using +[NUISettings setGlobalExclusions:]:
You can have styles or variable definitions only be applied for a particular device and/or orientation by using a @media query:
@media (device:ipad) {
/* styles or definitions for iPad */
}
@media (device:iphone) {
/* styles or definitions for iPhone */
}
@media (orientation:landscape) {
/* styles or definitions for landscape orientation */
}
@media (orientation:portrait) {
/* styles or definitions for portrait orientation */
}
@media (orientation:portrait) and (device:ipad) {
/* styles or definitions for portrait orientation on iPad */
}
Modifying Styling While The Application Is Running
To do this, add the following line after [NUISettings init]; in main.m, replacing @"/path/to/Style.nss" with the absolute file path of your .nss file (e.g. /Users/myusername/projects/ios/MyApp/Style.nss):
Now, whenever you modify and save your .nss file while the app is running, the new changes will be applied instantaneously, without any need to rebuild the app. This can drastically speed up the process of styling. You'll want to remove this line when you create a release build.
Creating Custom Themes
Because all of the style rules are contained in NUIStyle.nss, it's easy to create an NUI theme that can be reused in other projects. If you make one you like, let me know, and I'll likely be very happy to include it in this repo.
Migrating From Subclasses To Categories
Version 0.1 of NUI required that you manually make your app's UI components inherit from NUI classes (e.g. NUIButton). NUI no longer requires this, as it uses UIKit categories instead subclasses. If you were previously using NUI 0.1, and update to a newer version of NUI, you'll want to simply unset those custom classes, so that, for example, a UIButton is simply a UIButton, instead of being a NUIButton (this would be done either in Identity Inspector > Custom Class or in the application code).
Style Classes
Below are all of the currently available style classes, their corresponding UI component classes, and the properties they support. Value types (e.g. Color, Gradient) are described below in Style Value Types.
BorderStyle - A border style, as rendered by a UITextBorderStyle. Accepted values are none, line, bezel, and rounded.
Box - A series of 1 to 4 integers that specify the widths of a box's edges. Interpreted like CSS's padding and margin properties (top, right, bottom, left). Examples: 15 (a box with a width of 15 for each edge), 10 15 (a box with a width of 10 for the top and bottom edges and 15 for the right and left edges)
Color - A hex color (e.g. #FF0000); a rgb, rgba, hsl, or hsla expression (e.g. rgb(255,0,0) or hsla(0.5, 0, 1.0, 0.5)); or a color name that UIColor has a related method name for (e.g. red, yellow, clear). If [UIColor redColor] is supported, then red is supported.
FontName - A font name. See available values here. Can also be one of the following:
system
boldSystem
italicSystem
blackSystem
heavySystem
lightSystem
mediumSystem
semiboldSystem
thinSystem
ultraLightSystem
Gradient - Two Colors that will create a vertical gradient. background-color-top and background-color-bottom need to be defined in separate .nss properties.
Image - A name of an image, as used in [UIImage imageNamed:name] (e.g. MyImage.png).
Number - A number (e.g. -1, 4.5)
Offset - Two numbers comprising the horizontal and vertical values of an offset (e.g. -1,1)
SeparatorStyle - A separator style, as rendered by a UITableViewSeparatorStyle. Accepted values are none, single-line, and single-line-etched.
TextAlign - A text alignment (e.g. left, right, center)
TextTransform - A text transform (e.g. uppercase, lowercase, capitalize, none)
VerticalAlign - A vertical alignment (e.g. top, center, bottom, fill)
KeyboardAppearance - A keyboard appearance (e.g. default, dark, light, alert)
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