64 lines
1.7 KiB
Objective-C
64 lines
1.7 KiB
Objective-C
//
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// TimeIntervalToStringTransformer.m
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// Preferences
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//
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// Created by Christopher Snowhill on 7/1/22.
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//
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#import "TimeIntervalToStringTransformer.h"
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#import <math.h>
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@implementation TimeIntervalToStringTransformer
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+ (Class)transformedValueClass {
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return [NSString class];
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}
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+ (BOOL)allowsReverseTransformation {
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return YES;
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}
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// Convert from string to NSURL
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- (id)reverseTransformedValue:(id)value {
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if(value == nil) return nil;
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if([value isKindOfClass:[NSString class]]) {
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NSString *theString = (NSString *)value;
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NSArray *components = [theString componentsSeparatedByString:@":"];
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double interval = 0.0;
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for(size_t i = 0, j = [components count]; i < j; ++i) {
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interval += ([components[j - i - 1] doubleValue]) * pow(60.0, i);
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}
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return @(interval);
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}
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return nil;
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}
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- (id)transformedValue:(id)value {
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if(value == nil) return @"";
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if([value isKindOfClass:[NSNumber class]]) {
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NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
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[formatter setAllowedUnits:NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond];
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double secondsValue = [value doubleValue];
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double fractionValue = fmod(secondsValue, 1.0);
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secondsValue = (double)(int)secondsValue;
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NSString *wholePart = [formatter stringFromTimeInterval:(NSTimeInterval)secondsValue];
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NSUInteger fractionMillis = (int)(fractionValue * 1000.0);
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if(fractionMillis >= 1) {
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NSString *fractionPart = [NSString stringWithFormat:@".%03lu", fractionMillis];
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fractionPart = [fractionPart stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithRange:NSMakeRange('0', 1)]];
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return [wholePart stringByAppendingString:fractionPart];
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}
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return wholePart;
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}
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return @"";
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}
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@end
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