iOS NSTimer HELP

M

Michael H

macrumors newbie

Original poster

• Nov 19, 2009

• #1

😕 Error & Warning fixed, however when I Build & Go app loads ok but flipToSecond method doesn't seem to be called. I placed an NSLog in flipToSecond method to check if it is being called NO LUCK.

Code:

-(void) applicationDidFinishLaunching : (UIApplication *) application {
	
	timer = [NSTimer scheduledTimerWithTimeInterval: 1.0 target:self selector:@selector(flipToSecond:) userInfo:nil repeats: NO]; // change YES to NO

}

//define the targetmethod

- (void) flipToSecond: (NSTimer *) timer {
		
	NSLog(@"flipToSecond was successful!");
	
}

Last line in console is:

Pending breakpoint 1 - "objc_exception_throw" resolved
(gdb)

Can't seem to figure it out. Help Please.

 

K

kainjow

Moderator emeritus

• Nov 19, 2009

• #2

Do you get any warnings when compiling? What does the debugger show when it breaks on the exception?

 

dejo

Moderator emeritus

• Nov 19, 2009

• #3

How is timer declared?

 

PhoneyDeveloper

macrumors 68040

• Nov 19, 2009

• #4

Non-repeating timing actions can usually be more simply implemented with performSelector:withObject:afterDelay:

 

M

Michael H

macrumors newbie

Original poster

• Nov 19, 2009

• #5

timer declared in .h file

Code:

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController {

	NSTimer *timer;
	
}

@property (nonatomic, retain) NSTimer *timer;


@end

Debugger indicates build successful.

Am I missing something on starting the loop?

 

dejo

Moderator emeritus

• Nov 19, 2009

• #6

applicationDidFinishLaunching: is an application delegate method; it won't be called on your FirstViewController.

 

M

Michael H

macrumors newbie

Original poster

• Nov 19, 2009

• #7

THANKS so much everyone for your help.

-(void)viewDidLoad {

[self performSelector: @selector(flipToSecond🙂 withObject: nil afterDelay: 3.0];

[super viewDidLoad];
}

Used performSelector instead of NSTimer and placed it in viewDidLoad instead of applicationDidFinishLaunching.

I've learned a lot from everyone and again thank all of you.

 

dejo

Moderator emeritus

• Nov 20, 2009

• #8

Here's a bit more help: make sure you use the code tags when including code snippets. This sticky has more details: Posting code, please use the

Code:

 tags[/URL]

 

M

Michael H

macrumors newbie

Original poster

• Nov 20, 2009

• #9

Thanks I didn't know about the code tags