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Fix bug in sizeWithFont #1917

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merged 3 commits into from
Feb 9, 2017
Merged

Fix bug in sizeWithFont #1917

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80f98ae
Fix bug in sizeWithFont
aballway Feb 4, 2017
5420ff1
Constrained height is only ignored when it is less than one lineheight
aballway Feb 7, 2017
d90ca7b
Handle nil font in sizeWithFont
aballway Feb 8, 2017
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13 changes: 12 additions & 1 deletion Frameworks/UIKit/NSString+UIKitAdditions.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,11 @@ - (CGSize)drawAtPoint:(CGPoint)point
// Returns the bounding box size this string would occupy when drawn as specified
// All sizeWith... functions in this file funnel to this
- (CGSize)_sizeWithAttributes:(NSDictionary<NSString*, id>*)attributes constrainedToSize:(CGSize)size {
UIFont* font = attributes[NSFontAttributeName];
if (font == nil) {
return CGSizeZero;
}

if ([attributes objectForKey:NSParagraphStyleAttributeName]) {
NSMutableDictionary* copied = [NSMutableDictionary dictionaryWithDictionary:attributes];
woc::unique_cf<CTParagraphStyleRef>
Expand All @@ -263,7 +268,13 @@ - (CGSize)_sizeWithAttributes:(NSDictionary<NSString*, id>*)attributes constrain
size.height = std::numeric_limits<CGFloat>::max();
}

return CTFramesetterSuggestFrameSizeWithConstraints(framesetter.get(), CFRangeMake(0, self.length), nullptr, size, nullptr);
CGSize ret = CTFramesetterSuggestFrameSizeWithConstraints(framesetter.get(), CFRangeMake(0, self.length), nullptr, size, nullptr);

// If the constrained height is less than a line height sizeWithFont will increase the returned size to fit at least one line
CGFloat lineHeight = [font ascender] - [font descender];
ret.height = std::max(ret.height, lineHeight);

return ret;
}

// Private helper that converts a UILineBreakMode -> NSParagraphStyle
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18 changes: 18 additions & 0 deletions tests/unittests/UIKit/NSString+UIKitAdditionsTests.mm
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Original file line number Diff line number Diff line change
Expand Up @@ -16,10 +16,28 @@

#import <TestFramework.h>
#import <UIKit/UIKit.h>
#import <CppUtils.h>

static constexpr double c_errorDelta = .0001;
TEST(NSString_UIKitAdditions, ShouldNotReturnSizeOfZeroWidth) {
CGSize size =
[@"TEST" sizeWithFont:[UIFont systemFontOfSize:12.0f] constrainedToSize:CGSizeZero lineBreakMode:NSLineBreakByWordWrapping];
EXPECT_LT(0.0, size.width);
EXPECT_LT(0.0, size.height);
}

TEST(NSString_UIKitAdditions, SizeWithFontShouldReturnLineHeightWhenConstrainedHeightIsTooSmall) {
CGSize givenSize = { 0, 15 };
UIFont* font = [UIFont systemFontOfSize:144];
CGFloat lineHeight = [font ascender] - [font descender];
CGSize size = [@"TEST" sizeWithFont:font constrainedToSize:givenSize];
EXPECT_NEAR(lineHeight, size.height, c_errorDelta);

size = [@"TEST\nTEST" sizeWithFont:font constrainedToSize:givenSize];
EXPECT_NEAR(lineHeight, size.height, c_errorDelta);
}

TEST(NSString_UIKitAdditions, SizeWithNoFontShouldReturnCGSizeZero) {
CGSize arbitrarySize = { 100, 150 };
EXPECT_EQ(CGSizeZero, [@"TEST" sizeWithFont:nil constrainedToSize:arbitrarySize]);
}