Sorry for posting about this but I have been wrestling with it for sometime, I have been trying to use the timeIntervalSinceDatebut its not behaving. This is the m file:
#import "ViewController.h"
@interface ViewController()
@end
@implementation ViewController //warning: Method definition for 'timeIntervalSinceDate:' not found
-(IBAction) setButtonTapped:(id)sender {
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
NSString *dateTimeString = [dateFormatter stringFromDate: dateTimePicker.date ];
NSLog( @"Set button tapped : %@", dateTimeString );
NSDate* currentDate = [NSDate date];
NSTimeInterval secs = [dateTimeString timeIntervalSinceDate:currentDate]; //error: No visible @interface for 'NSString' declares the selector 'timeIntervalSinceDate:’
NSLog(@"Seconds %f", secs);
[self scheduleLocalNotificationWithDate: dateTimePicker.date];
[self presentMessage:@"succesfully set!"];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
and this is the h file:
#import <UIKit/UIKit.h>
#import <AvFoundation/AVFoundation.h>
@interface ViewController : UIViewController <AVAudioPlayerDelegate>
{
IBOutlet UIDatePicker *dateTimePicker;
}
- (NSTimeInterval)timeIntervalSinceDate:dateTimePicker;
-(IBAction) setButtonTapped:(id)sender;
@end
Also what would the method be for timeIntervalSinceDate? I couldn't find any info on it and as I'm new to this want sure how to work it out for myself.
Thanks
Your are trying to perform a method of NSDate on an NSString object (dateTimeString). Convert it to NSDate format first and then call the 'timeIntervalSinceDate:' method on the NSDate object.
Refer this post on how to convert NSString to NSDate.
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