改变UITabBarController的高度方法

1. // 改变tabBarController高度  
2. UITabBarController *mTabBar = [[UITabBarController alloc] init];  
3. mTabBar.tabBar.frame = CGRectMake(0, 460-40, 320, 40);  
4. UIView * transitionView = [[mTabBar.view subviews] objectAtIndex:0];  
5. transitionView.height = 460-40;  

7.改变导航栏的属性

[UINavigationBar appearance].barTintColor = [UIColor grayColor];

    [UINavigationBar appearance].tintColor = [UIColor whiteColor];

    [UINavigationBar appearance].barStyle = UIBarStyleBlack;

    8.改变tabBarController 中的tabBar的大小

    for (UIBarItem *item in mainTab.tabBar.items) {

        [item setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:

[UIFont fontWithName:@"Helvetica" size:20.0], NSFontAttributeName, nil]

                            forState:UIControlStateNormal];

    }