Convert NSTimeInterval to NSString in iPhone?

Question

How to covert the NSTimeInterval to NSString? I have

NSTimeInterval  today = [[NSDate date] timeIntervalSince1970];

I have to give "today" as input as NSString.

score 79 · Accepted Answer · answered Nov 25 '10 at 14:33

79

NSTimeInterval is just a double type so you can convert it to string using +stringWithFormat: method

NSTimeInterval  today = [[NSDate date] timeIntervalSince1970];
NSString *intervalString = [NSString stringWithFormat:@"%f", today];

answered Nov 25 '10 at 14:33

Vladimir

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Thanks ,i was trying with %@ instead of %f. – Warrior Nov 25 '10 at 14:42
2

%@ is only for objects. And moreover, objects that respond to the `-description` message. – jer Nov 25 '10 at 14:43
@jer, or localizedDescription it seems... anyway description method is defined in NSObject so all its descendants respond to it – Vladimir Nov 25 '10 at 14:45
All descendents of NSObject do yes, but descendents of NSProxy do not. Sorry, I wasn't being explicit. – jer Nov 25 '10 at 14:52
actually you made a good point - as most classes inherit from NSObject and respond to -description: method it is so easy to lose care and accidentally call it on those objects which do not respond – Vladimir Nov 25 '10 at 15:29
What's the point of typedefing NSTimeInterval if I have to know what it stands for to log the value of this type. It looks like a breach in abstraction to me. Isn't there a truly platform-independent way to deal with typedefs? – Alexei Sholik Feb 04 '11 at 10:50

score 3 · Answer 2 · answered Nov 03 '19 at 15:04

-(NSString*)formattedDuration:(NSTimeInterval)interval{
    NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
    formatter.allowedUnits = NSCalendarUnitHour | NSCalendarUnitMinute;
    formatter.zeroFormattingBehavior = NSDateComponentsFormatterZeroFormattingBehaviorPad;
    NSString *string = [formatter stringFromTimeInterval:interval];
    NSLog(@"%@", string);
    // output: 0:20:34
    return string;
}

Convert NSTimeInterval to NSString in iPhone?

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