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[ios, macos] added a distance formatter
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| #import <Foundation/Foundation.h> | ||
| #import <CoreLocation/CoreLocation.h> | ||
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| #import "MGLFoundation.h" | ||
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| NS_ASSUME_NONNULL_BEGIN | ||
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| /** | ||
| `MGLDistanceFormatter` implements a formatter object meant to be used for | ||
| geographic distances. The user’s current locale will be used by default | ||
| but it can be overriden by changing the locale property of the numberFormatter. | ||
| */ | ||
| MGL_EXPORT | ||
| @interface MGLDistanceFormatter : NSLengthFormatter | ||
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| /** | ||
| Returns a localized formatted string for the provided distance. | ||
| @param distance The distance, measured in meters. | ||
| @return A localized formatted distance string including units. | ||
| */ | ||
| - (NSString *)stringFromDistance:(CLLocationDistance)distance; | ||
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| @end | ||
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| NS_ASSUME_NONNULL_END |
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| #import "MGLDistanceFormatter.h" | ||
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| @interface MGLDistanceFormatter() | ||
| @end | ||
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| @implementation MGLDistanceFormatter | ||
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| static const CLLocationDistance METERS_PER_MILE = 1609.344; | ||
| static const double YARDS_PER_MILE = 1760.0; | ||
| static const double FEET_PER_MILE = YARDS_PER_MILE * 3.0; | ||
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| - (NSString *)stringFromDistance:(CLLocationDistance)distance { | ||
| double miles = distance / METERS_PER_MILE; | ||
| double feet = miles * FEET_PER_MILE; | ||
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| NSLengthFormatterUnit unit = NSLengthFormatterUnitMillimeter; | ||
| [self unitStringFromMeters:distance usedUnit:&unit]; | ||
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| self.numberFormatter.roundingIncrement = @0.25; | ||
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| if (unit == NSLengthFormatterUnitYard) { | ||
| if (miles > 0.2) { | ||
| unit = NSLengthFormatterUnitMile; | ||
| return [self stringFromValue:miles unit:unit]; | ||
| } else { | ||
| unit = NSLengthFormatterUnitFoot; | ||
| self.numberFormatter.roundingIncrement = @50; | ||
| return [self stringFromValue:feet unit:unit]; | ||
| } | ||
| } else { | ||
| return [self stringFromMeters:distance]; | ||
| } | ||
| } | ||
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| @end |
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| #import <Mapbox/Mapbox.h> | ||
| #import <XCTest/XCTest.h> | ||
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| @interface MGLDistanceFormatterTests : XCTestCase | ||
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| @end | ||
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| @implementation MGLDistanceFormatterTests | ||
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| - (void)testAbbreviatedMetricUnits { | ||
| MGLDistanceFormatter *formatter = [[MGLDistanceFormatter alloc] init]; | ||
| formatter.numberFormatter.locale = [NSLocale localeWithLocaleIdentifier:@"en_CA"]; | ||
| for (CLLocationDistance distance=0; distance <= 10000; distance+=5) { | ||
| NSString *unit = [[formatter stringFromDistance:distance] componentsSeparatedByString:@" "][1]; | ||
| NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF IN %@", @[@"mm", @"cm", @"m", @"km"]]; | ||
| XCTAssert([predicate evaluateWithObject:unit], @"Should only contain metric units"); | ||
| } | ||
| } | ||
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| - (void)testAbbreviatedImperialUnits { | ||
| MGLDistanceFormatter *formatter = [[MGLDistanceFormatter alloc] init]; | ||
| formatter.numberFormatter.locale = [NSLocale localeWithLocaleIdentifier:@"en_US"]; | ||
| for (CLLocationDistance distance=0; distance <= 10000; distance+=5) { | ||
| NSString *unit = [[formatter stringFromDistance:distance] componentsSeparatedByString:@" "][1]; | ||
| NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF IN %@", @[@"ft", @"mi"]]; | ||
| XCTAssert([predicate evaluateWithObject:unit], @"Should only contain imperial units"); | ||
| } | ||
| } | ||
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| @end |
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