iOS Simple Image Question..

[xArtx]

Hi Guys,

Just starting out here...

            UIImage *myImage = [UIImage imageNamed:@"imageArt.PNG"];
            CGPoint imagePoint = CGPointMake(156, 53);
            [myImage drawAtPoint:imagePoint];

Does this code read the image from the device's flash every time it occurs?
If so, how can I separate it so the image is loaded just once and can be
printed to the screen multiple times?

Cheers, Art.

 

[ArtOfWarfare]

I happen to know this one off the top of my head because I wondered the same thing roughly a year ago, but I'll point out how I learned the answer:

I checked Apple's docs.

From Apple's UIImage Class Reference, in the section for the imageNamed: method

Discussion
This method looks in the system caches for an image object with the specified name and returns that object if it exists. If a matching image object is not already in the cache, this method loads the image data from the specified file, caches it, and then returns the resulting object.

 

[xArtx]

I happen to know this one off the top of my head because I wondered the same thing roughly a year ago, but I'll point out how I learned the answer:

I checked Apple's docs.

From Apple's UIImage Class Reference, in the section for the imageNamed: method

So it looks like I can reuse exactly the same three lines even if I print the picture to the screen a hundred times...
Thanks 🙂

 

[ArtOfWarfare]

So it looks like I can reuse exactly the same three lines even if I print the picture to the screen a hundred times...
Thanks 🙂

I am a little confused why you're using the other two lines instead of a UIImageView.

 

[xArtx]

I'm drawing 11x11 pixel bitmap icons over a gps map drawn with quartz 2d.
This is basically how I'm drawing the icon at the same screen point that a plain
Point Of Interest dot would be displayed.

I've read here:
http://xcodenoobies.blogspot.com.au/2011/02/best-way-to-use-uiimageview-memory.html
That this way to print images never frees the memory, but it also says it's faster than
the alternative the tutorial demonstrates.