how to resize the button image in iphone - iphone

Question

im new in iphone.now im developing button image view in iphone.here images are images displaying large size i want to resize the images. that means images are displayed like medium size. i implement code like this.
images = [[NSMutableArray alloc]init];
[images addObject:[UIImage imageNamed:#"bearlarge.jpg"]];
[images addObject:[UIImage imageNamed:#"bufflo_large.jpg"]];
[images addObject:[UIImage imageNamed:#"camel_large.jpg"]];
UIView *view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
int row = 0;
int column = 0;
for(int i = 0; i < images.count; ++i) {
// UIImage *thumb = [images objectAtIndex:i];
UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(column*105+14, row*105+10, 50,50);
[button setImage:[images objectAtIndex:i] forState:UIControlStateNormal];
[button addTarget:self
action:#selector(buttonClicked:)
forControlEvents:UIControlEventTouchUpInside];
button.tag = i;
[view addSubview:button];
if (column == 2) {
column = 0;
row++;
} else {
column++;
}
}
//[view setContentSize:CGSizeMake(320, (row+1) * 80 + 10)];
self.view = view;
[view release];
can any one plz send me code for how to resize the button images in iphone.
Thank you in advançe.

Answer 1

You could create this category for UIImage:
- (UIImage *)rescaleImageToSize:(CGSize)size {
CGRect rect = CGRectMake(0.0, 0.0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
[self drawInRect:rect]; // scales image to rect
UIImage *resImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resImage;
}

Answer 2

Better add a UIImageView over the button. So that you can easily change the frame size.
CODE
UIButton *imageBut=[[UIButton alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
UIImageView *img=[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
img.userInteractionEnabled=NO;
[imageBut addSubview:img];
[self.view addSubview:imageBut];
[imageBut release];
[img release];
Or else, use
[button setBackgroundImage:YourImage];

Answer 3

setImage will set the image with original size in which you are included that into your project.
setBackgroundImage will resize the original image.
[button setBackgroundImage:[images objectAtIndex:i] forState:UIControlStateNormal];

Answer 4

-(void)scaleImage:(id)sender
{
if([(UIPinchGestureRecognizer*)sender state] == UIGestureRecognizerStateEnded)
{
lastScale = 1.0;
return;
}
CGFloat scale = 1.0 - (lastScale - [(UIPinchGestureRecognizer*)sender scale]);
CGAffineTransform currentTransform = [(UIPinchGestureRecognizer*)sender view].transform;
CGAffineTransform newTransform = CGAffineTransformScale(currentTransform, scale, scale);
[[(UIPinchGestureRecognizer*)sender view] setTransform:newTransform];
lastScale = [(UIPinchGestureRecognizer*)sender scale];
}