How to fill background image of an UIView

I have an UIView and I set a background image in this way:

self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"sfond-appz.png"]];

My problem is that back-image is not centered inside the view, but it's replayed some times to fill all the view. Is there a way to center image inside uiview and scretch to have screen size?

Note: I can't use UIImageView for background cause I have a scrollview.

You need to process the image beforehand, to make a centered and stretched image. Try this:

UIGraphicsBeginImageContext(self.view.frame.size);
[[UIImage imageNamed:@"image.png"] drawInRect:self.view.bounds];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

self.view.backgroundColor = [UIColor colorWithPatternImage:image];

For Swift use this...

UIGraphicsBeginImageContext(self.view.frame.size)
UIImage(named: "ImageName.png")?.draw(in: self.view.bounds)
        
if let image = UIGraphicsGetImageFromCurrentImageContext(){
    UIGraphicsEndImageContext()
    self.view.backgroundColor = UIColor(patternImage: image)
}else{
    UIGraphicsEndImageContext()
    debugPrint("Image not available")
 }

The colorWithPattern: method is really for generating patterns from images. Thus, the customization you require is most likely not possible, nor is it meant to be.

Indeed you need to use a UIImageView to center and scale an image. The fact that you have a UIScrollView does not prevent this:

Make self.view a generic view, then add both the UIImageView and the UIScrollView as subviews. Make sure all is wired up correctly in Interface Builder, and make the background color of the scroll view transparent.

This is IMHO the simplest and most flexible design for future changes.

Repeat:

UIImage *img = [UIImage imageNamed:@"bg.png"];
view.backgroundColor = [UIColor colorWithPatternImage:img];

Stretched

UIImage *img = [UIImage imageNamed:@"bg.png"];
view.layer.contents = img.CGImage;

Correct way to do in Swift 4, If your frame as screen size is correct then put anywhere otherwise, important to write this in viewDidLayoutSubviews because we can get actual frame in viewDidLayoutSubviews

   override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        UIGraphicsBeginImageContext(view.frame.size)
        UIImage(named: "myImage")?.draw(in: self.view.bounds)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        view.backgroundColor = UIColor.init(patternImage: image!)
    }

For Swift 2.1 use this...

    UIGraphicsBeginImageContext(self.view.frame.size)
    UIImage(named: "Cyan.jpg")?.drawInRect(self.view.bounds)
    
    let image: UIImage! = UIGraphicsGetImageFromCurrentImageContext()
    
    UIGraphicsEndImageContext()
    
    self.view.backgroundColor = UIColor(patternImage: image)

You can use UIGraphicsBeginImageContext method to set the size of image same that of view.

Syntax : void UIGraphicsBeginImageContext(CGSize size);

 #define IMAGE(imageName) (UIImage *)[UIImage imageWithContentsOfFile:
  [[NSBundle mainBundle] pathForResource:imageName ofType:IMAGE_TYPE_PNG]]
    
        UIGraphicsBeginImageContext(self.view.frame.size);
        [[UIImage imageNamed:@“MyImage.png"] drawInRect:self.view.bounds];
        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        
    self.view.backgroundColor = [UIColor colorWithPatternImage:IMAGE(@"mainBg")];

For Swift 3.0 use the following code:

    UIGraphicsBeginImageContext(self.view.frame.size)
    UIImage(named: "bg.png")?.drawAsPattern(in: self.view.bounds)
    let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
    UIGraphicsEndImageContext()
    self.view.backgroundColor = UIColor(patternImage: image)

The marked answer is fine, but it makes the image stretched. In my case I had a small tile image that I wanted repeat not stretch. And the following code was the best way for me to solve the black background issue:

UIImage *tileImage = [UIImage imageNamed:@"myTileImage"];
UIColor *color = [UIColor colorWithPatternImage:tileImage];
UIView  *backgroundView = [[UIView alloc] initWithFrame:self.view.frame];
[backgroundView setBackgroundColor:color];
//backgroundView.alpha = 0.1; //use this if you want to fade it away.
[self.view addSubview:backgroundView];
[self.view sendSubviewToBack:backgroundView];

Swift 4 Solution :

@IBInspectable var backgroundImage: UIImage? {
    didSet {
        UIGraphicsBeginImageContext(self.frame.size)
        backgroundImage?.draw(in: self.bounds)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        if let image = image{
            self.backgroundColor = UIColor(patternImage: image)
        }
    }
}