4.7 自定义tabbar

自定义tabbar

#import "AppDelegate.h"
#import "ADTabBarController.h"
#import "ViewController1.h"
#import "ViewController2.h"
#import "ViewController3.h"

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    ViewController1 * vc1 = [[ViewController1 alloc] init];
    vc1.view.backgroundColor = [UIColor redColor];
    
    ViewController2 * vc2 = [[ViewController2 alloc] init];
    vc2.view.backgroundColor = [UIColor yellowColor];
    
    ViewController3 * vc3 = [[ViewController3 alloc] init];
    vc3.view.backgroundColor = [UIColor blueColor];
    
    //分栏控制器
    ADTabBarController * tab = [[ADTabBarController alloc] init];
    tab.viewControllers = @[vc1, vc2, vc3];
    
    _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    _window.backgroundColor = [UIColor whiteColor];
    _window.rootViewController = tab;
    [_window makeKeyAndVisible];
    
    return YES;
}

#import "ADTabBarController.h"

@implementation ADTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //隐藏系统tabbar
    self.tabBar.hidden = YES;
    //创建自己的tabbar
    [self buildTabbar];
}

- (void)buildTabbar {
    UIImageView * tabbarBottom = [[UIImageView alloc] initWithFrame:CGRectMake(0, [[UIScreen mainScreen] bounds].size.height - 49, [[UIScreen mainScreen] bounds].size.width, 49)];
    //打开用户交互
    tabbarBottom.userInteractionEnabled = YES;
    tabbarBottom.image = [UIImage imageNamed:@"header_bg"];
    tabbarBottom.tag = 111;
    
    //添加按钮元素
    NSArray * titles = @[@"消息", @"朋友", @"动态"];
    NSArray * images = @[@"tab_faxian_normal", @"tab_friend_normal", @"tab_set_normal"];
    NSArray * selectedImages = @[@"tab_faxian_select", @"tab_friend_select", @"tab_set_select"];
    
    for (int i = 0; i < titles.count; i++) {
        UIButton * button = [[UIButton alloc] initWithFrame:CGRectMake([[UIScreen mainScreen] bounds].size.width / titles.count * i, 0, [[UIScreen mainScreen] bounds].size.width / titles.count, 49)];
        //设置标题
        [button setTitle:titles[i] forState:UIControlStateNormal];
        //设置标题颜色
        [button setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
        [button setTitleColor:[UIColor greenColor] forState:UIControlStateSelected];
        //更改字体大小
        button.titleLabel.font = [UIFont systemFontOfSize:12];
        //设置图片
        [button setImage:[UIImage imageNamed:images[i]] forState:UIControlStateNormal];
        [button setImage:[UIImage imageNamed:selectedImages[i]] forState:UIControlStateSelected];
        //绑定事件
        [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
        //容器视图控制器和其子视图控制器中的任意视图tag值不能重复
        button.tag = 100 + i;
        
        
        //调整标题与图标的位置
        /*
         UIKIT_STATIC_INLINE UIEdgeInsets UIEdgeInsetsMake(CGFloat top, CGFloat left, CGFloat bottom, CGFloat right) {
         UIEdgeInsets insets = {top, left, bottom, right};
         return insets;
         }
         */
        
        //UIEdgeInsets top：向上为负 向下为正 left：向左为负，向右为正  bottom：向下为负，向上为正 right：向右为负，向左为正   总结： 上左下右： 是哪个方向就向哪个方向为负，即：top：向上为负，向下为正
        button.titleEdgeInsets = UIEdgeInsetsMake(0, -button.imageView.bounds.size.width, -20, 0);
        button.imageEdgeInsets = UIEdgeInsetsMake(-20, 0, 0, -button.titleLabel.bounds.size.width);

        
        [tabbarBottom addSubview:button];
        
        //设置默认选中项，为0
        if (i == 0) {
            [self buttonClicked:button];
        }
    }
    
    
    [self.view addSubview:tabbarBottom];
}

- (void)buttonClicked:(UIButton *)button {
   
   
    NSInteger index = button.tag - 100;
    
    self.selectedIndex = index;
    
    //让选中的按钮处于选中状态
    UIImageView * imageView = (id)[self.view viewWithTag:111];
    NSArray * subViews = imageView.subviews;
    for (UIButton * button in subViews) {//这里循环的目的就是让之前按钮状态变为非选中状态，然后只选中一个之后，就是选中状态了。
        [button setSelected:NO];
    }
    //被点击的按钮设置为选中状态
    [button setSelected:YES];
}
@end

自定义tabbar.png