Navigation Bar和TabBar的美化經常使用方法整理，後面會補充

在AppDelegate文件中實現的方法有：

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

{

    [self customNavigationBar];

    [self customTabBar];

    return YES;

}

 //美化TabBar

-(void)customTabBar{

    UIEdgeInsets standardEdgeInsets = UIEdgeInsetsMake(10, 10, 10, 10);

    // 整個tabBar的背景圖

    [[UITabBar appearance] setBackgroundImage:[[UIImage imageNamed:@"tabbar_back"] resizableImageWithCapInsets:standardEdgeInsets resizingMode:UIImageResizingModeStretch]];

    //設置tab bar上每個項被選中時的背景圖

    [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_selected_back"]];

    //設置tab bar item上文字的位置 大小  顏色

    [[UITabBarItem appearance] setTitlePositionAdjustment:UIOffsetMake(0, -1)];

    [[UITabBarItem appearance]setTitleTextAttributes:@{

            NSForegroundColorAttributeName:[UIColor lightGrayColor],NSFontAttributeName:[UIFont boldSystemFontOfSize:12]

    } forState:UIControlStateNormal];

    [[UITabBarItem appearance]setTitleTextAttributes:@{

        NSForegroundColorAttributeName:[UIColor whiteColor],NSFontAttributeName:[UIFont boldSystemFontOfSize:12]

    } forState:UIControlStateSelected];

}

    //美化導航欄

-(void)customNavigationBar{

    //設置背景色

    [[UINavigationBar appearance] setBarTintColor:[UIColor blackColor]];

    //設置有導航條時,狀態欄的文字顏色

    [[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];

    //設置導航條的背景圖

    //[[UINavigationBar appearance] setBackgroundImage:[UIImage       imageNamed:@"NavigationBarDefault"] forBarMetrics:UIBarMetricsDefault];

    //設置左右按鈕上的文字顏色

    [[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];

    //設置返回按鈕中出現的箭頭樣式

    [[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@"back_btn"]];

    [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:[UIImage imageNamed:@"back_btn"]];

    //設置中間的title的文字樣式

    //設置陰影 顏色 偏移量

    NSShadow *shadow = [[NSShadow alloc]init];

    shadow.shadowColor = [UIColor redColor];

    shadow.shadowOffset = CGSizeMake(0, 1);

    NSDictionary *dictionary = [NSDictionary   dictionaryWithObjectsAndKeys:shadow,NSShadowAttributeName,[UIColor whiteColor],NSForegroundColorAttributeName,[UIFont fontWithName:@"HelveticaNeue-CondensedBlack" size:21],NSFontAttributeName,nil];

    [[UINavigationBar appearance] setTitleTextAttributes:dictionary];

}

//在控制器中要實現的方法有

- (id)initWithCoder:(NSCoder *)aDecoder{

    self = [super initWithCoder:aDecoder];

    if(self){

        [self.navigationController.tabBarItem setImage:[UIImage imageNamed:@"tabbar_item_my_music"]];

        [self.navigationController.tabBarItem setSelectedImage:[[UIImage imageNamed:@"tabbar_item_my_music_selected"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] ];

}

    return self;

}