UIImageView image not showing up at all

Question

im using the followng method , to display image when a timestamp detecetd , am using dispatch_async(dispatch_get_main_queue(), to do UIImageView , its never works its should open a new screen full size image that it ,

 dispatch_async(dispatch_get_main_queue(), ^{ UIImage *myImage = [UIImage imageNamed:@"img.jpg"]; UIImageView *myImageView = [[UIImageView alloc] initWithImage:myImage]; [myImageView setFrame:CGRectMake(0, 0, 100, 200)]; [myImageView release]; ; });

my full code

 - (void) onPayload:(PayloadEvent *) event { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; NSString *header = @"[OnPayload] "; if (event.payloadType == TYPE_IDENTIFIED) { if ((event.contentID != -1) && (event.timeStamp == -1)) { [mUI performSelectorOnMainThread: @selector(Trace:) withObject:[NSString stringWithFormat:@"%@ StaticID detected: %x\t\tConfidence: %f\n", header,(int)event.contentID, event.confidence] waitUntilDone:NO]; } if ((event.timeStamp != -1) && (event.contentID == -1)) { [mUI performSelectorOnMainThread: @selector(Trace:) withObject:[NSString stringWithFormat:@"%@ Timestamp detected: %f\t\tConfidence: %f\n", header, event.timeStamp, event.confidence] waitUntilDone:NO]; dispatch_async(dispatch_get_main_queue(), ^{ UIImage *myImage = [UIImage imageNamed:@"img.jpg"]; UIImageView *myImageView = [[UIImageView alloc] initWithImage:myImage]; [myImageView setFrame:CGRectMake(0, 0, 100, 200)]; [myImageView release]; ; });

@Marco DonJuan - what type of object did you subclass here? is it a uiviewcontroller? or just a uiview? or something else entirely? — katzenhut
– katzenhut, Commented May 29, 2013 at 11:13
@MarcoDonJuan - i dont think you understand me. The class you a re operating in, what is its parent class? In your header file, theres something like '@interface MyClass : Parentclass' of what type is parentclass? — katzenhut
– katzenhut, Commented May 29, 2013 at 11:21

user529758 · Accepted Answer · 2013-05-29 10:34:33Z

1

You never add myImageView to any view as a subview.

answered May 29, 2013 at 10:34

user529758

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1 Comment

LeoSam Over a year ago

im getting Property 'View; not found on object of type error after i added it

Dharmbir Singh · Accepted Answer · 2013-05-29 10:40:00Z

1

Try to use this one in your code.

[self.view addSubview:myImageView];

answered May 29, 2013 at 10:40

Dharmbir Singh

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8 Comments

LeoSam Over a year ago

im getting Property 'View; not found on object of type error after i added sel.view

Dharmbir Singh Over a year ago

try to write [self.view addSubview:myImageView]; instead of sel.view

LeoSam Over a year ago

sir, its typo mistake here but in the code its self.view . and sorry for wasting your precious time.!

Dharmbir Singh Over a year ago

What problem your are getting.

LeoSam Over a year ago

here is error msg from xcode " Property 'View; not found on object of type ..."

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Bruno Koga · Accepted Answer · 2013-05-29 14:51:49Z

You are creating an ImageView, assigning an Image to it and releasing the ImageView. In other words, you're not displaying the ImageView anywhere.

If you can't do something like [self.view addSubview:imageView], it means that you're not running this code on a UIViewController subclass.

You basically need to add this ImageView you're creating as a subview for the current view before releasing it.

In which class are you running this code? Do you know which View Controller is currently being displayed?

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