I'm my app I need to crop and image downloaded from internet. I download the image using this method:
- (void) loadImageFromWeb {
NSURL* url = [NSURL URLWithString:self.imageURL];
NSURLRequest* request = [NSURLRequest requestWithURL:url];
[NSURLConnection sendAsynchronousRequest:request
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse * response,
NSData * data,
NSError * error) {
if (!error){
UIImage* image = [[UIImage alloc] initWithData:data];
[self.imageViewEpisode setImage:image];
}
}];
}
How I can crop it?
Define a rect, this rect will be the crop area of your image.
CGRect croprect = CGRectMake(x,y,width, height);
CGImageRef subImage = CGImageCreateWithImageInRect (yourimage,croprect);
Here we have used CoreGraphics to create a sub image from your image.
Creates a bitmap image using the data contained within a subregion of an existing bitmap image.
CGImageRef CGImageCreateWithImageInRect (
CGImageRef image,
CGRect rect
);
Parameters
image
The image to extract the subimage from.
rect
A rectangle whose coordinates specify the area to create an image from.
Return Value
A CGImage object that specifies a subimage of the image. If the rect parameter defines an area that is not in the image, returns NULL.
Finally generate image,
UIImage *newImage = [UIImage imageWithCGImage:subImage];
There are multiple libraries that can do that for you. You can either pick one and work with it, or study a couple and understand how it's done.
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