修改导航栏上的背景和字体颜色
移除系统tabbar上的按钮
按钮的选中与取消
界面搭建一般都是三级控制器，标签控制器-->导航控制器-->视图控制器
这里，因为每个标签项管理的视图有的是一样的，所以我们可以用继承的办法
以阿里星球项目为例, 其他控制器都继承BaseViewController，一些相同的内容都写在这里
@interface DynamicViewController : BaseViewController
修改导航栏上的背景
//1.设置导航栏的背景图片
[self.navigationBar setBackgroundImage:[UIImage imageNamed:@"nav_bg"] forBarMetrics:UIBarMetricsDefault];
//2.设置导航栏标题的字体颜色
NSDictionary *dic = @{NSForegroundColorAttributeName:[UIColor whiteColor],
NSFontAttributeName:[UIFont systemFontOfSize:16]};
[self.navigationBar setTitleTextAttributes:dic];
移除系统tabbar上的按钮
/**
* 自定义TabbarController
1.设置tabbarController 的viewControllers
2.移除系统的按钮和tabbar
3.创建 自定义的tabbar
*/
@implementation AliTabbarController
- (void)viewDidLoad {
[super viewDidLoad];
//1.设置tabbarController 的viewControllers
[self creatViewControllers];
//2.移除系统自带的tabbar的子视图
[self removeSystemTabbarSubviews];
//3.自定义tabbar 上控件
[self creatSubViews];
}
#pragma mark - 1.设置viewController
-(void)creatViewControllers {
//1.创建视图控制器
DynamicViewController *dynamic = [[DynamicViewController alloc] init];
DIscoverViewController *discover = [[DIscoverViewController alloc] init];
MessageViewController *message = [[MessageViewController alloc] init];
MineViewController *mine = [[MineViewController alloc] init];
//2.给每一个视图控制器添加导航控制器
NSArray *controllers = @[dynamic,discover,message,mine];
NSMutableArray *navis = [[NSMutableArray alloc] initWithCapacity:4];
for (UIViewController *viewController in controllers) {
//创建导航控制器
BaseNavigationController *navigation = [[BaseNavigationController alloc] initWithRootViewController:viewController];
[navis addObject:navigation];
}
self.viewControllers = navis;
}
#pragma mark - 2.移除系统自带的tabbar的子视图
-(void)removeSystemTabbarSubviews {
for (UIView *view in self.tabBar.subviews) {
NSLog(@"%@",view);
//判断子视图 是否属于这类 UITabBarButton
//1.[类名 class] 得出这个类
//2.NSClassFromString(NSString) 使用字符串转换得出一个类
if ([view isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
[view removeFromSuperview];
}
}
}
#pragma mark - 3.自定义tabbar子视图
-(void)creatSubViews {
//1.创建tabbar背景图片视图
UIImageView *bjImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, kScreenW, kTabbar)];
bjImageView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"tabBarViewBg"]];
[self.tabBar addSubview:bjImageView];
CGFloat itemWidth = kScreenW / 4.0;
NSArray *imageNames = @[@"trends",@"find",@"message",@"my"];
//2.创建四个按钮
for (int i = 0; i <self.viewControllers.count; i++) {
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
//设置按钮frame
button.frame = CGRectMake(i * itemWidth, 0, itemWidth, kTabbar);
//设置图片
NSString *imageNormal = [NSString stringWithFormat:@"trends_%@_normal",imageNames[i]];
NSString *imageSelected = [NSString stringWithFormat:@"trends_%@_click",imageNames[i]];
[button setImage:[UIImage imageNamed:imageNormal] forState:UIControlStateNormal];
[button setImage:[UIImage imageNamed:imageSelected] forState:UIControlStateSelected];
button.tag = 1000 + i;
//设置第一个按钮为选中状态
if (button.tag == 1000) {
button.selected = YES;
}
[button addTarget:self
action:@selector(clickBtn:)
forControlEvents:UIControlEventTouchUpInside];
[self.tabBar addSubview:button];
}
}
-(void)clickBtn:(UIButton *)sender {
NSInteger index = sender.tag - 1000;
//1.切换视图控制器
self.selectedIndex = index;
//2.修改按钮的旋钮的选中状态
for (int i = 0; i < self.viewControllers.count; i++) {
UIButton *btn = (UIButton *)[self.tabBar viewWithTag:1000 + i];
btn.selected = NO;
}
sender.selected = !sender.selected;
}
