iOS Detect Date & Assign different function depending on day

[newtoiphonesdk]

Here is what I have so far. The only thing this needs to do is detect the date, and then depending on what that date is, post something different to Facebook. I only have it set up with one If statement for the moment just for testing. When I run it, it doesn't post the else statement, since today isn't Sunday.

-(IBAction)evite {
	NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
	[formatter setDateFormat:@"MM-dd-yyyy HH:mm"];
	todaysDate = [formatter stringFromDate:[NSDate date]];
	NSString *day = [todaysDate substringWithRange:NSMakeRange (3, 2)];
	if (day = "Sunday") {
		NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
		SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Sunday!  Bible Class @8:45 Worship @10:00!  Click link for our website."];
		SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
		[actionSheet showInView:self.tabBarController.view];
	}
	else
	{NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
	SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Wednesday!  Bible Class @8:45 Worship @10:00!  Click link for our website."];
	SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
		[actionSheet showInView:self.tabBarController.view];}
	
	
	
	
}

 

[newtoiphonesdk]

Thanks, if I read correctly, EEEE is what shows the full day name. I changed the formatter to this, and added the @"Sunday" to the code and have this.

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
	[formatter setDateFormat:@"EEEE"];
	todaysDate = [formatter stringFromDate:[NSDate date]];
	
	if (todaysDate = @"Sunday") {
		NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
		SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Sunday!  Bible Class @8:45 Worship @10:00!  Click link for our website."];
		SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
		[actionSheet showInView:self.tabBarController.view];
	}
	else
	{NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
	SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Wednesday!  Bible Class @8:45 Worship @10:00!  Click link for our website."];
	SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
		[actionSheet showInView:self.tabBarController.view];}

The warnings disappeared, but it still doesn't give the desired effect. Am I at least heading in the correct way?

 

[chown33]

-(IBAction)evite {
	NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
	[formatter setDateFormat:@"MM-dd-yyyy HH:mm"];
	todaysDate = [formatter stringFromDate:[NSDate date]];
	NSString *day = [todaysDate substringWithRange:NSMakeRange (3, 2)];
	if ([COLOR="Red"]day = "Sunday"[/COLOR]) {
		NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
		SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Sunday!  Bible Class @8:45 Worship @10:00!  Click link for our website."];
		SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
		[actionSheet showInView:self.tabBarController.view];
	}
	else
	[COLOR="Red"]{[/COLOR]NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
	SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Wednesday!  Bible Class @8:45 Worship @10:00!  Click link for our website."];
	SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
		[actionSheet showInView:self.tabBarController.view];[COLOR="red"]}[/COLOR]
	
	
}

The first red-hilited expression is wrong in several ways:
1. It's using assignment (=) instead of equality-test (==).
2. It's "comparing" to a C string ("foo"), not an NSString (@"foo").
3. Don't use == for comparing NSString equality, use the -isEqualToString: method of NSString.

The red-hilited { } are hard to see. Even when hilited in red. Use whitespace to make them more obvious.


For the overall design, you should probably use a switch statement, and use case labels that are the numeric values for days of the week. See NSDateComponents.
http://developer.apple.com/library/...ptual/DatesAndTimes/Articles/dtCalendars.html

 

[newtoiphonesdk]

Got it figured out thanks to help from another developer. Code used was Gregorian calendar from NSCalendarComponent:

-(IBAction)evite {
	NSCalendar* gregorian = [[[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar] autorelease];
	NSDateComponents* theDateComponents = [gregorian components: NSWeekdayCalendarUnit fromDate: [NSDate date]];
	NSInteger weekDay = theDateComponents.weekday;
	NSLog(@"Today is day %ld", weekDay);	
	if (weekDay == 1, 5, 6, 7) {
		NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
		SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Sunday!  Bible Class @8:45 Worship @10:00!  Click link for our website."];
		SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
		[item setCustomValue:@"https://fbcdn-photos-a.akamaihd.net/photos-ak-snc1/v43/136/198020576909620/app_1_198020576909620_358.gif" forKey:@"picture"];
		[actionSheet showInView:self.tabBarController.view];
	}
	else
	{NSURL *url = [NSURL URLWithString:@"http://www.marsalisavenuecoc.org"];
	SHKItem *item = [SHKItem URL:url title:@"Join me @ Marsalis Avenue Church of Christ this Wednesday!  Bible Class @10AM Study @7:00!  Click link for our website."];
	SHKActionSheet *actionSheet = [SHKActionSheet actionSheetForItem:item];
	[item setCustomValue:@"https://fbcdn-photos-a.akamaihd.net/photos-ak-snc1/v43/136/198020576909620/app_1_198020576909620_358.gif" forKey:@"picture"];
	[actionSheet showInView:self.tabBarController.view];}
	
	
	
	
}

 

[chown33]

	if (weekDay == 1, 5, 6, 7)

If that conditional is supposed to mean "if weekday is equal to one of the values 1, 5, 6, or 7", then that's not what it does.

It's syntactically valid C code, which means it will compile without an error or warning. It just doesn't do what I think you intend it to do.

 

[newtoiphonesdk]

If that conditional is supposed to mean "if weekday is equal to one of the values 1, 5, 6, or 7", then that's not what it does.

It's syntactically valid C code, which means it will compile without an error or warning. It just doesn't do what I think you intend it to do.

What is it doing? I run it in the simulator, and it works the way I intend. If it is Sunday Thursday Friday or Saturday it runs the code, but if it is a different day it runs the else code. However, in the actual iOS used for testing...it only uses the if statement, and never the else.

 

[chown33]

What is it doing? I run it in the simulator, and it works the way I intend. If it is Sunday Thursday Friday or Saturday it runs the code, but if it is a different day it runs the else code. However, in the actual iOS used for testing...it only uses the if statement, and never the else.

http://en.wikipedia.org/wiki/Comma_operator

You could use switch and case, as already mentioned.

You could also make an NSIndexSet containing 1, 5, 6, 7, then use containsIndex:weekday in the conditional.

 

[dejo]

Or you could just "or" multiple conditionals:

if (weekDay == 1 || weekDay == 5 || weekDay == 6 || weekDay == 7)

 

[chown33]

Or you could just "or" multiple conditionals:

if (weekDay == 1 || weekDay == 5 || weekDay == 6 || weekDay == 7)

Simplified:

if ( weekDay == 1 || weekDay >= 5 )