CODEWITHSUNDEEP
objective-cuiimageimage-resizing
gfcf14
gfcf14

Reputation: 350

Objective C - UIImage resizing not working

I have a program that fetches an image from the library, but I'm using code I found online to resize that image so that it can fit on the screen (basically making it 640x960), but then it would still be too big to display, so in another UIImage I'm copying the first resized image and re-resizing this one to make it about 1/4 of the screen (or 160x240). The code is this:

for ViewController.h:

UIImage *img;
UIImage *thumb;

-(UIImage*) scaleImage: (UIImage*)image toSize:(CGSize)newSize;

(this of course, is only the code related to my problem)

for ViewController.m

-(UIImage*) scaleImage: (UIImage*)image toSize:(CGSize)newSize {
    UIGraphicsBeginImageContext(newSize);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

and in the same m file on another function, the scaleImage function is called when pressing a button with these lines:

[self scaleImage:img toSize:CGSizeMake(640, 960)];
thumb = img;
[self scaleImage:thumb toSize:CGSizeMake(160, 240)];

In the project I've previously been able to successfully provide an image for img using [info objectForKey:UIImagePickerControllerOriginalImage]; which would be the image chosen from the library. I've already "file owned" everything so that this function takes place (and it does because I create an UIAlert within it and it shows, and a NSLog to print out when scaleImage starts and it does, twice), but the image is never re-sized!! Does anyone know why?? Please let me know, thank you for anyone who comments with help or suggestions!!

Upvotes: 1

Views: 330

Answers (1)

Martin R
Martin R

Reputation: 539685

Your scaleImage method returns the scaled image, for example 

thumb = [self scaleImage:img toSize:CGSizeMake(640, 960)];

Upvotes: 3

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