CODEWITHSUNDEEP
iosuiimageviewuiimage
scorpiozj
scorpiozj

Reputation: 2687

how to use [UIImage resizableImageWithCapInsets:]

I'd like to stretch a image with size 170x50 and show it in an image view with size 240x140. The original image looks like:

enter image description here

I want to keep the four corners and only stretch the center part. I use the following code:


    UIImage *originalImg = [UIImage imageNamed:@"ImageNamed"];
    UIImage *resizeImg = [originalImg resizableImageWithCapInsets:UIEdgeInsetsMake(20 ,10, 10, 10)];
    self.originalImgV.image = originalImg;
    self.resizedImgV.image = resizeImg;

Both originalImgV and resizedImgV are set to "aspect fill". I run it on the simulater, and the result is :

enter image description here

What I can't understand is: the resizedImgV has 2 arrows! Could any one tell me why and how can I use it correctly? Thanks

Upvotes: 6

Views: 14873

Answers (3)

Praveen Matanam
Praveen Matanam

Reputation: 2803

Stretching is processed in the vertical direction and then in the horizontal direction (or vice versa). So provide top & bottom offsets considering vertical direction that should not stretch and left & right offsets for horizontal direction.

Upvotes: 0

rmaddy
rmaddy

Reputation: 318774

Your issue is with the values you pass to UIEdgeInsetsMake. The values are top, left, bottom, right. Due to the arrow in the top left, you need to make sure your left value is big enough to go from the left edge of the image to just to the right of the arrow.

Given the image you posted, you want something like:

 UIEdgeInsetsMake(12, 32, 4, 4)

BTW - the image should only be left + right + 1 pixels wide and top + bottom + 1 pixels tall. So your image doesn't need to be nearly as big as it is.

Upvotes: 14

Prashant Nikam
Prashant Nikam

Reputation: 2251

Use this function, you can change the size of UIImage using this function.

+ (UIImage *)imageWithImage:(UIImage *)image scaledToSize:(CGSize)newSize {
    UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return newImage;
}

Hope this will help you.

Upvotes: -2

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