[ui/ios] Add helper methods for getting the bounding size of some text.

These helpers are meant to ease the transition from the deprecated
|sizeWithFont:constrainedToSize:| methods. They'll also help reduce
boilerplate compared to the iOS method
|boundingRectWithSize:options:attributes:context:|

BUG=364419

Review URL: https://codereview.chromium.org/704283002

Cr-Commit-Position: refs/heads/master@{#303237}

1 files changed, 14 insertions, 0 deletions

diff --git a/ui/ios/NSString+CrStringDrawing.mm b/ui/ios/NSString+CrStringDrawing.mm
index 214b0c1..e9274e9 100644
--- a/ui/ios/NSString+CrStringDrawing.mm
+++ b/ui/ios/NSString+CrStringDrawing.mm
@@ -9,6 +9,20 @@
 
 @implementation NSString (CrStringDrawing)
 
+- (CGRect)cr_boundingRectWithSize:(CGSize)size
+                             font:(UIFont*)font {
+  NSDictionary* attributes = font ? @{NSFontAttributeName: font} : @{};
+  return [self boundingRectWithSize:size
+                            options:NSStringDrawingUsesLineFragmentOrigin
+                         attributes:attributes
+                            context:nil];
+}
+
+- (CGSize)cr_boundingSizeWithSize:(CGSize)size
+                             font:(UIFont*)font {
+  return [self cr_boundingRectWithSize:size font:font].size;
+}
+
 - (CGSize)cr_pixelAlignedSizeWithFont:(UIFont*)font {
   DCHECK(font) << "|font| can not be nil; it is used as a NSDictionary value";
   NSDictionary* attributes = @{ NSFontAttributeName : font };