Dotted line border around UIView:

Its a Very Easy..

[yourView.layer setBorderWidth:5.0]; 

///just add image name and create image with dashed or doted drawing and add here 

[yourView.layer setBorderColor:[[UIColor colorWithPatternImage:
                [UIImage imageNamed:@"DotedImage.png"]] CGColor]]; 

Here, 

1. You just required add QuartzCore/QuartzCore.h Framework in project and 

2. import it like bellow in .m file

  #import <QuartzCore/QuartzCore.h>

Hope this help you...