I've been having one of those "I must be doing something stupid" days. The
code I'm trying to write needs to pad one string with spaces so that certain
characters line up visually with selected characters in a different string
(within a view). It seemed like a relatively easy task as long as I could
require the use of a monospaced font. However, it comes out looking various
kinds of wrong depending on how many spaces I add. I've tried this with a
number of Courier variants with the same result.
The following test seems to confirm that a string of spaces does not render in
the same bounding box as a string of alphanumeric characters or punctuation
marks. (Also, that there may not be a neat and obvious formula for how to
compensate.) Are these results reproducible? Was a fixed-size character width
a bad assumption? Or is it a bug?
- (void)debugFont {
UIFont *font = [UIFont fontWithName:@"CourierNewPS-BoldMT" size:24];
// With 22 characters, there's a width difference of 9
NSString *s1 = @"1234567890123456789012";
NSString *s2 = @" ";
// The choice of non-space character doesn't seem to matter
NSString *s5 = @"......................";
// With 23 characters, there's a width difference of 10
NSString *s3 = @"12345678901234567890123";
NSString *s4 = @" ";
NSLog(@"....@. size: %f", s1, [s1 sizeWithFont:font].width);
NSLog(@"....@. size: %f", s2, [s2 sizeWithFont:font].width);
NSLog(@"....@. size: %f", s5, [s5 sizeWithFont:font].width);
NSLog(@"....@. size: %f", s3, [s3 sizeWithFont:font].width);
NSLog(@"....@. size: %f", s4, [s4 sizeWithFont:font].width);
}
2010-12-10 14:19:03.936 FontTest[1834:207] .1234567890123456789012. size:
317.000000
2010-12-10 14:19:03.937 FontTest[1834:207] . . size:
308.000000
2010-12-10 14:19:03.938 FontTest[1834:207] ........................ size:
317.000000
2010-12-10 14:19:03.938 FontTest[1834:207] .12345678901234567890123. size:
332.000000
2010-12-10 14:19:03.939 FontTest[1834:207] . . size:
322.000000
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