jsai

- (UIImage *)blurredImageWithRadius:(CGFloat)radius {
 CIImage *inputImage = [[CIImage alloc] initWithCGImage:self.CGImage];

 CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
 [blurFilter setDefaults];
 [blurFilter setValue:inputImage forKey:kCIInputImageKey];
 [blurFilter setValue:@(radius) forKey:@"inputRadius"];

 CIImage *outputImage = [blurFilter valueForKey:kCIOutputImageKey];
 CIContext *context = [CIContext contextWithOptions:nil];

jsai

UISearchBar *searchBar = [[UISearchBar alloc] init];
self.navigationItem.titleView = searchBar;

UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"cancel", @"Cancel")
                                                                 style:UIBarButtonSystemItemCancel
                                                                target:self
                                                                action:@selector(cancelButtonClicked)];
self.navigationItem.rightBarButtonItem = cancelButton;

jsai

- (void)setupBackButtonWithSelector:(SEL)selector {
  // create a custom button
  LIButton *backButton = [LIButton buttonWithType:UIButtonTypeCustom];
  backButton.positionInNavBar = LIButtonNavPositionLeft;
  // more back button setup
 
  // add back button to navigation bar
  UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
  self.navigationItem.leftBarButtonItem = backItem;
}

jsai

#define RGBCOLOR(R,G,B)			[UIColor colorWithRed:R/255.0 green:G/255.0 blue:B/255.0 alpha:1.0]
#define NAV_TOOLBAR_BG_COLOR	RGBCOLOR(45.0,45.0,45.0)
#define NAV_TINT_COLOR			RGBCOLOR(0.0, 119.0, 181.0)
 
- (void)setupNavigationBar {
  UINavigationBar *navigationBar = self.navigationController.navigationBar;
  navigationBar.barStyle = UIBarStyleBlackOpaque;
  navigationBar.translucent = NO;
  navigationBar.backgroundColor = NAV_TOOLBAR_BG_COLOR;

jsai

#define LI_IS_IOS7_RUNTIME (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1)
 
// usage
if (LI_IS_IOS7_RUNTIME) {
  // iOS 7 code
}
else {
  // iOS 6 code
}

jsai

#ifdef __IPHONE_7_0
  // iOS 7 code 
#else
  // iOS 6 code
#endif