It is hard to change the appearance of UINavigationBar dynamically, so I made this lib to make the job easy.
First, import this lib:
#import "UINavigationBar+Awesome.h"
The category includes lots of method that helps to change UINavigationBar's appearance dynamically:
@interface UINavigationBar (Awesome) - (void)lt_setBackgroundColor:(UIColor *)backgroundColor; - (void)lt_setElementsAlpha:(CGFloat)alpha; - (void)lt_setTranslationY:(CGFloat)translationY; - (void)lt_reset; @end
You can call the various setter wherever you want, like:
[self.navigationController.navigationBar lt_setBackgroundColor:[UIColor blueColor]];
And usually in viewWillDisappear, you should call this method to avoid any side effects:
- (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [self.navigationController.navigationBar lt_reset]; }
See the example for details~