CODEWITHSUNDEEP
iphoneobjective-ciosimageuiimage
Quang Phạm Công
Quang Phạm Công

Reputation: 253

Draw Image After scale and rotate it, to other image iOS

I have and UIImageView with a smaller image than original image. and then i added many other UIImageView to the main imageview as the subviews. I also scale and rotate many subviews(imageview). Now i want to create the image from the original image with all sub view image attach on imageview, but keep position. my question is how can i draw many subview images into original image after scale and rotate them. i used CGContextRotateCTM but seem to be it rotate too much. Please help me my sample code is

CGContextRef context = UIGraphicsGetCurrentContext();
[originalImage drawAtPoint:CGPointZero];
for(UIView *aView in [self.mainImageView subviews]){
    float rate = 1000/self.mainImageView.frame.size.width;
    if(aView.tag != DELETE_ATTACH_IMAGEVIEW_TAG && aView.tag != ROTATE_ZOOM_IMAGEVIEW_TAG){
        CGRect rect = CGRectMake(aView.frame.origin.x*rate, aView.frame.origin.y*rate, aView.frame.size.width *rate, aView.frame.size.height*rate);
        if([aView isKindOfClass:[CustomImageView class]]){
            CustomImageView *temp = (CustomImageView *)aView;
            float rotation = [temp rotation];
            UIImage *tempImage= temp.image;
            CGContextRotateCTM(context, rotation);
            [tempImage drawInRect:rect];
        }

    }

}
originalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Upvotes: 2

Views: 1236

Answers (1)

Paras Joshi
Paras Joshi

Reputation: 20541

just capture this whole view and after use with one image from your this whole image 

- (UIImage *)captureView {

   //hide controls if needed
    CGRect rect = [self.view bounds];

    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [self.view.layer renderInContext:context];   
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;

}

after capture this image , set it as a background and remove otherall images if its not required..

Upvotes: 2

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