How to use -(id)init?!

Discussion in 'iOS Apps' started by lukelee, Jul 22, 2011.

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  1. lukelee, Jul 22, 2011

    lukelee macrumors newbie

    Joined:
    Apr 20, 2011
    Location:
    Sydney
    #1
    I just want to initialize NumberOfSides to 5! and display it. just can't get it right!

    .h
    Code:
    @interface HelloPolyViewController : UIViewController {
	IBOutlet UILabel *NumberOfSidesLabel;
	IBOutlet UIButton *decrease;
	IBOutlet UIButton *increase;
	int NumberOfSides;

}
@property(nonatomic,retain)IBOutlet UILabel *NumberOfSidesLabel;
@property int NumberOfSides;

-(IBAction)decrease:(id)sender;
-(IBAction)increase:(id)sender;
- (id)init;
    .m
    Code:
    #import "HelloPolyViewController.h"
@implementation HelloPolyViewController
@synthesize NumberOfSidesLabel;
@synthesize NumberOfSides;

- (id)init {
	if (self=[super init]) {
		NumberOfSides = 5;
	}
}


-(IBAction)decrease:(id)sender
{
	NumberOfSidesLabel.text = [NSString stringWithFormat:@"%d",NumberOfSides];
	NSLog(@"123 %d",NumberOfSidesLabel);
	
}
-(IBAction)increase:(id)sender {
	//
}
     
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  2. Jeffrey Lim, Jul 24, 2011

    Jeffrey Lim macrumors newbie

    Joined:
    Sep 9, 2003
    #2
    Use:

    NSLog(@"123 %d", NumberOfSides);

    or:

    NSLog(@"123 %@", NumberOfSidesLabel);
     
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  3. orangetripwire, Jul 24, 2011

    orangetripwire macrumors newbie

    Joined:
    Feb 24, 2009
    #3
    Code:
    - (id)init {
	if (self=[super init]) {
		NumberOfSides = 5;
	}
      [I]  return self;[/I]
}
    You need to return something in the method since you have - (id) init and not something like - (void) init. Note that the init method must return an - (id), so - (void) init is not a valid init method.

    Also like said above %d is for something like an int, %@ is for something like a string in the NSLog statement.
     
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