ios - Repeat image horizontally and vertically

Question

I want to repeat the following image:

to achieve the following background:

I tried a few codes as follow:

bluePatternView.backgroundColor = [UIColor colorWithPatternImage:
    [[UIImage imageNamed:@"blue_pattern.png"] stretchableImageWithLeftCapWidth:0 topCapHeight:0]];

and:

bluePatternView.backgroundColor = 
    [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"blue_pattern.png"]];

I also tried to draw image with CGContextDrawTiledImage with no success.

How that can be done?!

EDIT: result of implementing luk2302. please give him recognition by upvoting

bluePatternView.backgroundColor = 
  [UIColor colorWithPatternImage:[UIImage imageNamed:@"blue_pattern.png"]];

result:

Answer 1

I found solution in images.xcassets,

Step 1:- Put your image to images.xcassets

Step 2:- Click on image, then click on bottom right corner written “Show Slicing”

Step 3:- Click on Start Slicing

Step 4:- Click on "Slice Horizontally and Vertically" button

Step 5:- Here you will see 3-Horizontal and 3-Vertical slice lines.

• Put the most left vertical line to left side of image and both right most lines to right side of image.
  
• Put the most top line to top of image and both bottom most lines to bottom of image.
• So the final result will be looking like this.

Step 6:- Use this image.

And now image will be repeated.

Note:- If you give slicing to 2x image it will repeat just 2x image, for 3x images you need to do the same slicing.

Example by Apple