/* |
File: DetailViewController.m |
Abstract: A simple UIViewController that shows a localized label that contains detail information, including height and date data, about the user-selected mountain. |
Version: 1.3 |
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Copyright (C) 2014 Apple Inc. All Rights Reserved. |
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*/ |
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#import "DetailViewController.h" |
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// key names for values in mountain dictionary entries |
const NSString *kMountainNameString = @"name"; |
const NSString *kMountainHeightString = @"height"; |
const NSString *kMountainClimbedDateString = @"climbedDate"; |
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@interface DetailViewController () { |
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// Private formatter instances that we'll re-use |
NSNumberFormatter *numberFormatter; |
NSDateFormatter *dateFormatter; |
} |
@property (weak, nonatomic) IBOutlet UILabel *mountainDetails; |
@end |
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@implementation DetailViewController |
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- (void)viewDidLoad { |
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[super viewDidLoad]; |
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[self updateLabelWithMountainName:self.mountainDictionary[kMountainNameString] |
height:self.mountainDictionary[kMountainHeightString] |
climbedDate:self.mountainDictionary[kMountainClimbedDateString]]; |
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[[NSNotificationCenter defaultCenter] addObserver:self |
selector:@selector(currentLocaleOrTimeZoneDidChange:) |
name:NSCurrentLocaleDidChangeNotification |
object:nil]; |
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[[NSNotificationCenter defaultCenter] addObserver:self |
selector:@selector(currentLocaleOrTimeZoneDidChange:) |
name:NSSystemTimeZoneDidChangeNotification |
object:nil]; |
} |
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- (void)dealloc { |
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[[NSNotificationCenter defaultCenter] removeObserver:self]; |
} |
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- (void)viewDidLayoutSubviews { |
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[self.mountainDetails setPreferredMaxLayoutWidth:self.mountainDetails.bounds.size.width]; |
[self.view layoutIfNeeded]; |
} |
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#pragma mark - Notification Handler |
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- (void)currentLocaleOrTimeZoneDidChange:(NSNotification *)notif { |
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// When user changed the locale (region format) or time zone in Settings, we are notified here to |
// update the date format in UI. |
// |
[self updateLabelWithMountainName:self.mountainDictionary[kMountainNameString] |
height:self.mountainDictionary[kMountainHeightString] |
climbedDate:self.mountainDictionary[kMountainClimbedDateString]]; |
} |
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#pragma mark - Helper Methods |
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- (void)updateLabelWithMountainName:(NSString *)name height:(NSNumber*)height climbedDate:(NSDate*)climbedDate { |
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/* Create the localized UI label in the detail view using Localizable.strings |
and the passed-in mountain information. climbedDate is optional. */ |
NSString *sentence = @""; |
NSString *format; |
if (climbedDate != nil) { |
format = NSLocalizedString(@"sentenceFormat", |
@"A sentence with the mountain's name (first parameter), height (second parameter), and climbed date (third parameter)"); |
sentence = [NSString stringWithFormat:format, |
name, [self heightAsString:height], [self dateAsString:climbedDate]]; |
} else { |
/* Some mountains do not have a climbed date in our database, so use |
an alternate label sentence for these. */ |
format = NSLocalizedString(@"undatedSentenceFormat", |
@"A sentence with the mountain's name (first parameter), and height (second parameter), but no climbed date"); |
sentence = [NSString stringWithFormat:format, |
name, [self heightAsString:height]]; |
} |
/* Note that the mountainDetails UILabel is defined in Interface Builder as |
a multi-line UILabel. This was done by setting the "Layout, # Lines" setting |
to 0, and the "Font Size, Adjust to Fit" to off. */ |
self.mountainDetails.text = sentence; |
/* Note that by setting the text property on the mountainDetails UILabel, |
it automatically gets invalidated so we do not need to call setNeedsDisplay */ |
} |
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- (NSString*)heightAsString:(NSNumber*)heightNumber { |
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/* Create a single string expressing a mountain's height. Based on the |
Region Format (as determined using NSLocale information), we need to |
allow for the possibility that the user is using either metric or |
non-metric units. If the units are non-metric, we will need to manually |
convert. Also, note that we need to use the properly localized measurement |
units format (meters/feet) as NSFormatter does not handle measurement |
units (although it will handle decimal numbers for us). */ |
NSString *returnValue = @""; |
if (heightNumber != nil) { |
NSString *format = @"%d"; |
NSInteger height = [heightNumber integerValue]; |
NSNumber *usesMetricSystem = [[NSLocale currentLocale] objectForKey:NSLocaleUsesMetricSystem]; |
if (usesMetricSystem != nil && ![usesMetricSystem boolValue]) { |
/* Convert the height to feet */ |
height = (int) ((float) height * 3.280839895); |
format = NSLocalizedString(@"footFormat", @"Use to express a height in feet"); |
} else { |
format = NSLocalizedString(@"meterFormat", @"Use to express a height in meters"); |
} |
/* Specify we want the "new" 10.4 NSNumberFormatter behavior */ |
[NSNumberFormatter setDefaultFormatterBehavior:NSNumberFormatterBehavior10_4]; |
/* Use a NSNumberFormatter for properly formatting decimal values for the |
current locale/region format settings. For the measurement string, we've |
already loaded the localized string above. */ |
if (numberFormatter == nil) { |
numberFormatter = [[NSNumberFormatter alloc] init]; |
} |
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle]; |
returnValue = [NSString stringWithFormat:format, [numberFormatter stringFromNumber:@(height)]]; |
} |
return returnValue; |
} |
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- (NSString*)dateAsString:(NSDate*)date { |
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/* Create a single string expressing a mountain's climbed date, properly localized */ |
NSString *returnValue = @""; |
if (date != nil) { |
if (dateFormatter == nil) { |
dateFormatter = [[NSDateFormatter alloc] init]; |
} |
[dateFormatter setDateStyle:NSDateFormatterMediumStyle]; |
[dateFormatter setTimeStyle:NSDateFormatterNoStyle]; |
[dateFormatter setLocale:[NSLocale currentLocale]]; |
returnValue = [dateFormatter stringFromDate:date]; |
} |
/* As this code uses the current "locale", the date format will be in the format |
specified by the user's "Region Format" settings. If you need to use an |
alternate format internally, you can create and use NSLocales, e.g.: |
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NSLocale *enGBLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"]; |
[numberFormatter setLocale:enGBLocale]; |
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Doing so will not affect the current user-set language or region format. |
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Similarly, while you should always rely on the system and application bundle |
to pick the most appropriate resources for the current user language setting, |
if you need to know what the current user language setting is, you can do |
something like the following: |
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NSUserDefaults* defs = [NSUserDefaults standardUserDefaults]; |
NSArray* languages = [defs objectForKey:@"AppleLanguages"]; |
NSString* preferredLang = [languages objectAtIndex:0]; |
NSLog(@"Current language is %@", preferredLang); |
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Note that the iPhone does not support locales in the same way that Mac OS |
does (really only using locales for the Region Format settings) so if you |
try and get an array from standardUserDefaults for the key "AppleLocale", |
this will fail on the iPhone. */ |
return returnValue; |
} |
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@end |
