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Editorial Team
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Asked: 2026-05-13T09:37:30+00:00

I have a really simple app, and I’m stuck just in the beginning. Let

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I have a really simple app, and I’m stuck just in the beginning.
Let me post the code right here.

TapStackView.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>

@interface TapStackView : UIView
{
    //Layers.
    UIImageView *backgroundImageView;
    UIImageView *powerOn;
}
@property (nonatomic, retain) UIImageView *backgroundImageView;
@property (nonatomic, retain) UIImageView *powerOn;
@end

TapStackView.m

#import "TapStackView.h"

@implementation TapStackView
@synthesize backgroundImageView, powerOn;

//Initialize,
-(id)initWithFrame: (CGRect)frame
{
    if (self = [super initWithFrame:frame])
    {
        //Set up layers.
        self.backgroundImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"layout.png"]];

        self.powerOn = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"powerOn.png"]];     
        self.powerOn.center = CGPointMake(159 + powerOn.frame.size.width/2, 26 + powerOn.frame.size.height/2);

        //Attach to the view.
        [self addSubview:self.backgroundImageView];
        [self addSubview:powerOn];      

        NSLog(@"initWithFrame - powerOn.center is %f, %f", self.powerOn.center.x, self.powerOn.center.y);   

    }
    return self;
}

//Finger touched.
-(void)touchesBegan: (NSSet*)touches withEvent: (UIEvent*)event
{
    NSLog(@"-----");
    NSLog(@"touchesBegan - self.powerOn.center is %f, %f", self.powerOn.center.x, self.powerOn.center.y);   
}

@end

Console

[Session started at 2010-01-01 21:39:42 +0100.]
2010-01-01 21:39:44.177 TapStack[6261:20b] initWithFrame - powerOn.center is 186.000000, 53.000000
2010-01-01 21:39:45.149 TapStack[6261:20b] -----
2010-01-01 21:39:45.150 TapStack[6261:20b] touchesBegan - self.powerOn.center is 0.000000, 0.000000
2010-01-01 21:39:45.978 TapStack[6261:20b] -----
2010-01-01 21:39:45.979 TapStack[6261:20b] touchesBegan - self.powerOn.center is 0.000000, 0.000000
2010-01-01 21:39:48.914 TapStack[6261:20b] -----
2010-01-01 21:39:48.915 TapStack[6261:20b] touchesBegan - self.powerOn.center is 0.000000, 0.000000
2010-01-01 21:39:50.011 TapStack[6261:20b] -----
2010-01-01 21:39:50.012 TapStack[6261:20b] touchesBegan - self.powerOn.center is 0.000000, 0.000000

I just cannot imagine why can’t I see that powerOn property inside the touchesBegan method.
Any ideas?

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1 Answer

  1. Editorial Team

    I can’t reproduce this. How are you adding TapStackView to its superview? From a Window-based template, I just added this to applicationDidFinishLaunching:

        [window addSubview:[[[TapStackView alloc] initWithFrame:[window bounds]] autorelease]];

    It seems to work as you would expect:

    2010-01-01 17:23:00.873 Untitled[3708:207] initWithFrame - powerOn.center is 215.000000, 90.000000
2010-01-01 17:23:02.940 Untitled[3708:207] -----
2010-01-01 17:23:02.941 Untitled[3708:207] touchesBegan - self.powerOn.center is 215.000000, 90.000000
2010-01-01 17:23:11.199 Untitled[3708:207] -----
2010-01-01 17:23:11.200 Untitled[3708:207] touchesBegan - self.powerOn.center is 215.000000, 90.000000
2010-01-01 17:23:11.663 Untitled[3708:207] -----
2010-01-01 17:23:11.664 Untitled[3708:207] touchesBegan - self.powerOn.center is 215.000000, 90.000000
2010-01-01 17:23:11.665 Untitled[3708:207] -----
2010-01-01 17:23:11.665 Untitled[3708:207] touchesBegan - self.powerOn.center is 215.000000, 90.000000

    BTW, you’re leaking both backgroundImageView and powerOn.

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