iOS中tabBar按钮再次点击实现界面刷新(包含完整demo)【特色功能:在更新数据期间旋转tabbar的icon】

/** 记录上一次被点击按钮的tag */
@property (nonatomic, assign) NSInteger previousClickedTag;

    self.tabBarController.delegate = self;
- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{

- (void)viewDidLoad {
    [super viewDidLoad];
    self.automaticallyAdjustsScrollViewInsets = NO;

    self.view.backgroundColor = HWColor(245, 245, 245);
    [self setNavigationContent];
    
//    self.tabBarItem addObserver:<#(nonnull NSObject *)#> forKeyPath:<#(nonnull NSString *)#> options:<#(NSKeyValueObservingOptions)#> context:<#(nullable void *)#>
    self.tabBarController.delegate = self;
    
    
    self.previousClickedTag = 100;//默认没有点击任何tabbar
    
}

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{
    
    
    if (tabBarController.selectedIndex == 0  && [self.tabBarItem.title isEqualToString:homeTabbarSelectedTitle]) {
        
        //进行数据刷新
        
        if ( self.previousClickedTag ==  tabBarController.selectedIndex ) {//进行了第二次点击
            
            [self.tableView.mj_header beginRefreshing];
        }
        
        
        
    }
    
    self.previousClickedTag = tabBarController.selectedIndex;//记录上一次按钮的点击
    
    
}

NSString * const GYQhomeTabbarTitle = @"首页";
NSString * const GYQhomeTabbarSelectedTitle = @"刷新";

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
    
    
    if ([item.title isEqualToString:GYQhomeTabbarTitle]) {
        
        
        item.title = GYQhomeTabbarSelectedTitle;
        
        
        
    }else{
        
        
        // 切换到其他子Tab时，将首页tab的title刷新改为《首页》
        for (UITabBarItem *childView in tabBar.items) {
                if ([childView.title isEqualToString:GYQhomeTabbarSelectedTitle] &&  childView != item) {
                    
                    childView.title = GYQhomeTabbarTitle;
                    
                    
                }
           
            
        }
        
        
    }

//————————————————
//版权声明：本文为CSDN博主「#公众号：iOS逆向」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
//原文链接：https://blog.csdn.net/z929118967/article/details/77885824
}

/**
 是否刷新tabbar  的图片
 */
@property (nonatomic, assign) BOOL isreloadData;
/**
 存储UITabBarSwappableImageView，用于旋转tabbar的图片
 
 */
@property (nonatomic,strong)  UIView *imageView;

// 遍历tabBar上的子控件,给"UITabBarButton"类型的按钮绑定动画效果事件
//(注意:遍历添加动画事件的时机是在layoutSubviews布局子控件方法中)
- (void)layoutSubviews{
    [super layoutSubviews];
    
    for (UIControl *tabBarButton in self.subviews) {
        if ([tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            [tabBarButton addTarget:self action:@selector(tabBarButtonClick:) forControlEvents:UIControlEventTouchUpInside];
        }
    }
}

// 动画效果(遍历UITabBarButton按钮的子控件,
//如果需要对图片添加动画,寻找"UITabBarSwappableImageView"类型的图片子控件;
////如果需要对按钮下面的文字添加动画,寻找"UITabBarButtonLabel"类型的文字子控件即可).
- (void)tabBarButtonClick:(UIControl *)tabBarButton
{
    for (UIView *imageView in tabBarButton.subviews) {
        if ([imageView isKindOfClass:NSClassFromString(@"UITabBarSwappableImageView")]) {
            if (self.block) {
                self.block(imageView);
            }
            }}}

/**
 是否更换tabbar的图片
 */
@property (nonatomic, assign) BOOL isreloadData;