Cannot set image in NSImageView

Question

I have a little piece of program to display an image in an Image-well. I've being testing around but there's nothing shows up on the screen. Appreciate any one can help.

.h file:

#import <Cocoa/Cocoa.h>
@interface TestAppDelegate : NSObject <NSApplicationDelegate>
{
    IBOutlet NSImageView *myImageView;
}
@property (assign) IBOutlet NSWindow *window;
@property (assign) IBOutlet NSImageView *myImageView;
@end

.m file:

#import "TestAppDelegate.h"

@implementation TestAppDelegate

- (void)dealloc
{
    [super dealloc];
}

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSString * filePath = @"haha.png";  // the pic file that I added into the project
    NSImage * aImage = [NSImage imageNamed:filePath];

    if(aImage)
    {
        NSLog(aImage.name);
        NSLog(@"size %f %f",aImage.size.width,aImage.size.height);
        //both of the NSLogs work but the Image-well shows blank            
        [myImageView setImage:aImage];
    }
}
@end

Answer 1

You have to use UIImageView in place of NSImageView.

Answer 2

Replace

NSImage * aImage = [NSImage imageNamed:filePath]

to

NSImage * aImage = [[NSImage alloc] initWithContentsOfFile:filePath];

Answer 3

it might be that the png file's not found in the application's bundle. But the confusing thing is that both the NSlog functions ('NSLog(aImage.name) and NSLog(@"size %f %f",aImage.size.width,aImage.size.height)'). are working and feedbacking.

Here is how I added the png image. i created a new group folder called 'Resources', and then right clicked and added the prepared photo. Not sure if anything wrong i was doing here.

I finally figured it out. Just implly added a 'self' ahead to 'myImageView set Image:aImage'. like [self.myImageView setImage:aImage];

Answer 4

I had a similar issue too where I added an image to the Assets.xcassets folder, but the image would not appear. The issue turned out to be a format issue, I had specified box.png as the image was exported as a PNG image. However my Mac app didn't recognise it (for whatever reason). So I removed the .png from the string name:

[NSImage imageNamed:@"box"]

For some reason, the image I had made was not recognised as a PNG image. It doesn't matter though, because as per the Apple dev docs, you don't need to specify the file format for PNG images:

For PNG images, you may omit the filename extension. For all other file formats, always include the filename extension.