Loading UIview background fastly using image - iphone

Question

Iam developing one application.In that i want to set the uiview background as image.That image size is 1.6 mb.I followed the below code.
UIGraphicsBeginImageContext(self.view.frame.size);
[[UIImage imageNamed:#"image.png"] drawInRect:self.view.bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
self.view.backgroundColor = [UIColor colorWithPatternImage:image];
But it takes more time compared to small size image.So please help me how to load 3mb size of image also like as small size of image.

Answer 1

You could do the drawing operations on a background queue, so it won't freeze the UI:
CGRect imgRect = self.view.bounds;
dispatch_async(dispatch_get_global_queue(0, 0), ^{
UIGraphicsBeginImageContext(imgRect.size);
[[UIImage imageNamed:#"image.png"] drawInRect:imgRect];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIColor* bgcolor = [UIColor colorWithPatternImage:image];
dispatch_async(dispatch_get_main_queue(), ^{
self.view.backgroundColor = bgcolor;
});
});
Also optimize the image by using the tool ImageOptim.

Answer 2

Its best if you resize image and then add in Application bundle to execute faster.
here I think there is no need get image firstly for resizing for UIView s pattern image in background.
You can solve memory issue like this:
NSString *imgfile = [[NSBundle mainBundle] pathForResource:#"image" ofType:#"png"];
UIImage *currentImage = [UIImage imageWithContentsOfFile:imgfile];
self.view.backgroundColor = [UIColor colorWithPatternImage:currentImage];
Refer ios-imagenamed-vs-imagewithcontentsoffile link.
EDIT : Use #phix23 answer for smooth UI