Created
August 29, 2014 18:45
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Challenge
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“Challenge | |
Use two instances of NSDate to figure out how many seconds you have been alive. | |
First, NSDate has an instance method timeIntervalSinceDate:. This method takes one argument – another instance of NSDate. It returns the number of seconds between the NSDate that received the message and the NSDate that was passed in as the argument. | |
It looks something like this: | |
double secondsSinceEarlierDate = [laterDate timeIntervalSinceDate:earlierDate]; | |
Second, you will need to create a new date object that is set to a given year, month, etc. You will do this with the help of an NSDateComponents object and an NSCalendar object. Here is an example: | |
NSDateComponents *comps = [[NSDateComponents alloc] init]; | |
[comps setYear:1969]; | |
[comps setMonth:4]; | |
[comps setDay:30]; | |
[comps setHour:13];” | |
Excerpt From: Ward, Mikey. “Objective-C Programming: The Big Nerd Ranch Guide, 2/e (Big Nerd Ranch Guides).” iBooks. |
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