How to set background image of a view

Question

I am a beginner at Obj-C Cocoa Touch iPhone OS   I wish to have a background for my app with different images everytime the the view is called   Say I have 10 images  I  ve used it like this     random image generation NSString  imageName  int aRandomNumber   arc4random     10  imageName   NSString stringWithFormat   g d jpg  aRandomNumber    self view backgroundColor    UIColor colorWithPatternImage  UIImage imageWithContentsOfFile    NSBundle mainBundle  resourcePath  stringByAppendingPathComponent imageName     NSLog   aRandomNumber is  d   aRandomNumber     random image is generated   Its working fine   Now  say I have text labels on my view and the text isn t displaying correctly due to image colors  How can I make it a little transparent   I guess in Interface Builder its called alpha   Say my image isn t 320x480  How do I set it to fill the entire view    How can I do it with UIView UIImageView   I found initWithHue saturation brightness alpha  in the documentation but it s not working   self view backgroundColor     UIColor alloc  initWithHue 0 0 saturation 1 0 brightness 1 0 alpha 1 0     Please Help     A friend suggested           self view backgroundColor    UIColor colorWithPatternImage  UIImage imageWithContentsOfFile    NSBundle mainBundle  resourcePath  stringByAppendingPathComponent imageName                 he told it s more efficient because it doesn t save the image in the cache

User · Answer

use this  self view backgroundColor    UIColor colorWithPatternImage  UIImage imageNamed   Default

User · Answer

Besides all of the other responses here  I really don t think that using backgroundColor in this way is the proper way to do things   Personally  I would create a UIImageView and insert it into your view hierarchy   You can either insert it into your top view and push it all the way to the back with sendSubviewToBack  or you can make the UIImageView the parent view   I wouldn t worry about things like how efficient each implementation is at this point because unless you actually see an issue  it really doesn t matter   Your first priority for now should be writing code that you can understand and can easily be changed   Creating a UIColor to use as your background image isn t the clearest method of doing this

User · Answer

self view backgroundColor    UIColor colorWithPatternImage  UIImage imageNamed   imageName png       more info with example project

User · Answer

You want the background color of your main view to be semi-transparent   There s nothing behind it    so nothing will really happen however   If you want to modify the alpha of any view  use the alpha property   UIView  someView     UIView alloc  init       someView alpha   0 8f    Sets the opacity to 80        Views themselves have the alpha transparency  not just UIColor   But since your problem is that you can t read text on top of the images    either     DESIGN  Reconsider the design placement of the images   Are they necessary as background images   What about the placement of the labels   CODE  It s not exactly the best solution  but what you could do is create a UIView whose frame takes up the entire page and add some alpha transparency to it   This will create an  overlay  of sorts     UIView  overlay      UIView alloc  init  autorelease   overlay frame   self view bounds  overlay alpha   0 2f   self view addSubview overlay       Add the rest of the views

User · Answer

simple way       - void  viewDidLoad      self view backgroundColor     UIColor alloc  initWithPatternImage  UIImage       imageNamed   background png          super viewDidLoad

User · Answer

You can set multiple background image in every view using custom method as below   make plist for every theam with background image name and other color   import  lt Foundation Foundation h gt   interface ThemeManager   NSObject  property  nonatomic strong  NSDictionary styles     ThemeManager   sharedManager  - void selectTheme    end                import  ThemeManager h                implementation ThemeManager              synthesize styles                 ThemeManager   sharedManager                               static ThemeManager  sharedManager   nil                  if  sharedManager    nil                                        sharedManager     ThemeManager alloc  init                                      sharedManager selectTheme                   return sharedManager                            -  id init                               if   self    super init                                                         return self                            - void selectTheme                  NSUserDefaults  defaults    NSUserDefaults standardUserDefaults                   NSString  themeName    defaults objectForKey   AppTheme        DefaultTheam                    NSString  path     NSBundle mainBundle  pathForResource themeName ofType   plist                    self styles    NSDictionary dictionaryWithContentsOfFile path                              end   Can use this via    NSDictionary  styles    ThemeManager sharedManager  styles   NSString  imageName    styles objectForKey   backgroundImage     imgViewBackGround setImage  UIImage imageNamed imageName

User · Answer

It s a very bad idea to directly display any text on an irregular and ever changing background  No matter what you do  some of the time the text will be hard to read    The best design would be to have the labels on a constant background with the images changing behind that    You can set the labels background color from clear to white and set the from alpha to 50 0 you get a nice translucent effect  The only problem is that the label s background is a stark rectangle    To get a label with a background with rounded corners you can use a button with user interaction disabled but the user might mistake that for a button    The best method would be to create image of the label background you want and then put that in an imageview and put the label with the default transparent background onto of that    Plain UIViews do not have an image background  Instead  you should make a UIImageView your main view and then rotate the images though its image property  If you set the UIImageView s mode to  Scale to fit  it will scale any image to fit the bounds of the view

[iphone] How to set background image of a view?

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