Measuring the pixel width of a string

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On iPhone OS it is slightly different, instead look at the NSString UIKit Additions Reference. The idea is the same as in Cocoa for Mac OS X, but there are more methods.

For single lines of text use:

- (CGSize)sizeWithFont:(UIFont *)font 
              forWidth:(CGFloat)width 
         lineBreakMode:(UILineBreakMode)lineBreakMode

And for multiline texts use:

- (CGSize)sizeWithFont:(UIFont *)font 
     constrainedToSize:(CGSize)size 
         lineBreakMode:(UILineBreakMode)lineBreakMode

The use of a UILineBreakMode as argument for single lines of text can be confusing, but this is because the line break is also used to define how to truncate the text.

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