Question

I want to get the box in which a certain substring of a NSString has been rendered in a UILabel (or a UITextView, if easier), taking into account the rect in which the entire NSString is drawn, pus the line break mode, font, etc. In OSX, in the additions, there is a method that returns that rect

- (NSRect)boundingRectWithSize:(NSSize)size options:(NSStringDrawingOptions)options attributes:(NSDictionary *)attributes

Does iOS have something similar? I checked the documentation but I didn’t find anything. Is out there something similar?

Answer 1

I think, this may help you

// Create some text view for example
_tv = [[UITextView alloc] initWithFrame:CGRectMake(10.0, 10.0, 300.0f, 250.0f)];
_tv.text = @"dkjshfk shf kjhs fkj ewkjhf kwfwkj fhwk fwh fjkw hfjkhwe fkjwh";
_tv.font = [UIFont systemFontOfSize:24];
[self.view addSubview:_tv];

and this is what you looking for

- (void)someAction:(id)sender
{
    // Here is a frame of selected text in text view
    CGRect frame = [_tv firstRectForRange:_tv.selectedTextRange];

    // Mark selected text with yellow
    UIView *v = [[[UIView alloc] initWithFrame:frame] autorelease];
    v.backgroundColor = [UIColor yellowColor];
    v.alpha = .8f;
    [_tv addSubview:v];
}