Use iOS5's UIAppearance protocol to custom UINavigationBar background

iOS5的 UIAppearance protocal能幹嘛呢？

這邊有篇中文的參考

http://furnacedigital.blogspot.tw/2011/11/appearance.html

這邊還有一篇英文的參考，有這些Class的示範喔

UIActivityIndicatorView

UIBarButtonItem

UIBarItem

UINavigationBar

UIPopoverController

UIProgressView

UISearchBar

UISegmentedControl

UISlider

UISwitch

UITabBar

UITabBarItem

UIToolbar

UIView

UIViewController

http://www.ioslearner.com/uiappearance-proxy-protocol-tutorial/

想要整個 App 都套同一種客製的UI，就加在 AppDelegate 裡面就行囉！

- (void)customUI

{

    // Set the background image for *all* UINavigationBars

    UIImage *navBG = [[UIImage imageNamed:@"navbar-iphone.png"]

                      resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];

    [[UINavigationBar appearance] setBackgroundImage:navBG

                                       forBarMetrics:UIBarMetricsDefault];

    // Customize navigation bar back button

    UIImage *navBackButtonBG = [[UIImage imageNamed:@"nav-back-button.png"]

                                resizableImageWithCapInsets:UIEdgeInsetsMake(5, 16, 5, 7)];

    [[UIBarButtonItem appearance] setBackButtonBackgroundImage:navBackButtonBG

                                                      forState:UIControlStateNormal

                                                    barMetrics:UIBarMetricsDefault];

    

    // Customize navigation bar buttons

    UIImage *navButtonBG = [[UIImage imageNamed:@"nav-button.png"]

                            resizableImageWithCapInsets:UIEdgeInsetsMake(0, 5, 0, 5)];

    

    [[UIBarButtonItem appearance] setBackgroundImage:navButtonBG forState:UIControlStateNormal

                                          barMetrics:UIBarMetricsDefault];

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    // Override point for customization after application launch.

    

    [self customUI];

    

    return YES;

}