NSString class manages metrics used when drawing attributed strings. Prior to drawing, you can create an instance of this class and use it to specify the minimum scale factor and tracking adjustments for a string. After drawing, you can retrieve the actual values that were used during drawing.
- iOS 6.0+
- macOS 10.11+
- tvOS 9.0+
- watchOS 2.0+
To use this class, allocate and initialize a new instance, set the minimum values, and pass your object to one of the corresponding
NSAttributed methods that take the context object as a parameter. Upon completion of drawing, you can use the actual drawing values to make adjustments or record where the string was actually drawn.