CODEWITHSUNDEEP
iphonecocoa-touch
Corey Floyd
Corey Floyd

Reputation: 25969

iPhone Attributed String

Any ideas on how to get the functionality of an attributed string on an iPhone.

Specifically, I am writing out chemical compounds and want to properly display subscripts: for example:

H2O (the 2 should be a subscript)

Thanks for any suggestions

Upvotes: 1

Views: 1260

Answers (3)

polyclick
polyclick

Reputation: 2703

Just posting this to help others trying to make the scientific notation work. Works for 3.2 and higher (maybe lower, just give it a shot ;))

// Property to show
NSString *formula = cellData.formula;

// Setup font
UIFont *font = [UIFont fontWithName:@"Dax-Bold" size:5];

// Draw property
UIGraphicsPushContext(context);
[formula drawAtPoint:CGPointMake(cellData.rect.origin.x + 2, cellData.rect.origin.y + 15) withFont:font];
UIGraphicsPopContext();

The drawAtPoint: uses the current context so make sure you use this method in you drawRect: method.

I had to wrap the drawAtPoint: method with two UIGraphics methods to make sure my text got rendered in a multi thread application.

Make sure that your font supports the unicode characters. If it doesn't the default font will be used. You can add missing font glyphs with a tool called FontLab.

Upvotes: 0

rpetrich
rpetrich

Reputation: 32336

You may find it more convenient to use the Unicode characters set up for subscripts:

SUBSCRIPT TWO is U+2082: H₂0

Upvotes: 6

Ben Gottlieb
Ben Gottlieb

Reputation: 85532

You can use a UIWebView and HTML, or draw it yourself using the NSString + UIKit additions, or CoreGraphics.

Upvotes: 1

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