日常記錄工程中（公司產(chǎn)品日常抄淘寶）遇到的問題~~
先上效果圖（原諒我沒有GIF的圖）：

Tabbar效果圖1

Tabbar效果圖2

//SLMainTabbarVC.h 文件
#import <UIKit/UIKit.h>
#import "SLTabBarViewController.h"
@interface SLMainTabbarVC : SLTabBarViewController
@end

//-------------------------------

//SLMainTabbarVC.m 文件
#import "SLMainTabbarVC.h"
#import "ViewController.h"

@implementation SLMainTabbarVC
-(instancetype)init{
    if (self = [super init]) {
        [self createUI];
        self.delegate = self;
    }
    return self;
}

-(void)createUI{
    ViewController *vc1 = [[ViewController alloc] init];
    vc1.hidesBottomBarWhenPushed = NO;
    UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:vc1];
    
    ViewController *vc2 = [[ViewController alloc] init];
    vc2.hidesBottomBarWhenPushed = NO;
    UINavigationController *nav2 = [[UINavigationController alloc] initWithRootViewController:vc2];
    
    ViewController *vc3 = [[ViewController alloc] init];
    vc3.hidesBottomBarWhenPushed = NO;
    UINavigationController *nav3 = [[UINavigationController alloc] initWithRootViewController:vc3];
    
    ViewController *vc4 = [[ViewController alloc] init];
    vc4.hidesBottomBarWhenPushed = NO;
    UINavigationController *nav4 = [[UINavigationController alloc] initWithRootViewController:vc4];
    
    ViewController *vc5 = [[ViewController alloc] init];
    vc5.hidesBottomBarWhenPushed = NO;
    UINavigationController *nav5 = [[UINavigationController alloc] initWithRootViewController:vc5];
    
    NSArray *vc = @[nav1,nav2,nav3,nav4,nav5];
    NSArray *title = @[@"首頁(yè)",@"分類",@"發(fā)現(xiàn)中心",@"購(gòu)物車",@"個(gè)人中心"]; 
    NSArray *image = @[@"tab_1_n-",@"tab_2_n-",@"tab_3_n-",@"tab_4_n-",@"tab_5_n-"];
    NSArray *selectImage = @[@"tab_1_h-",@"tab_2_h-",@"tab_3_h-",@"tab_4_h-",@"tab_5_h-"];
    
    for (int i = 0; i<vc.count; i++) {
        [self addChildViewController:vc[i] andTitle:title[i] image:image[i] selectImage:selectImage[i]];
    }

}

-(void)addChildViewController:(UIViewController *)vc andTitle:(NSString *)title image:(NSString *)image selectImage:(NSString *)selectImage{
    //設(shè)置title和圖片
    //**特別說(shuō)明**：見代碼后面
    vc.tabBarItem.title = @"";
    vc.tabBarItem.image = [[UIImage imageNamed:image]imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)];
    vc.tabBarItem.selectedImage = [[UIImage imageNamed:selectImage] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)];
    
//    //設(shè)置文字位置揍异，在有文字時(shí)用于調(diào)整文字的位置
//    [vc.tabBarItem setTitlePositionAdjustment:UIOffsetMake(0, -2.5)];
    //設(shè)置圖片位置  注意：圖片 上下 or 左右 的間距要一樣馅而，否側(cè)有些手機(jī)上會(huì)變形
    [vc.tabBarItem setImageInsets:UIEdgeInsetsMake(7, 0, -7, 0)]; //
    
    //添加到
     [self addChildViewController:vc];
}

#pragma mark - UITabBarControllerDelegate
//點(diǎn)擊下面的tabBar的按鈕時(shí)候,根據(jù)BOOL值來(lái)判斷是否處于可繼續(xù)點(diǎn)擊狀態(tài)
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController NS_AVAILABLE_IOS(3_0){
    //此方法里我用來(lái)判斷在用戶點(diǎn)擊“個(gè)人中心”時(shí)是否登錄
    return YES;
}

//此方法系統(tǒng)自動(dòng)調(diào)用徒河，寫在繼承自UITabBarController的controller中
//設(shè)置點(diǎn)擊的動(dòng)畫----本次重點(diǎn)
-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
    NSInteger index = [self.tabBar.items indexOfObject:item];
    NSMutableArray * tabbarbuttonArray = [NSMutableArray array];
    for (UIView *tabBarButton in self.tabBar.subviews) {
        if ([tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            [tabbarbuttonArray addObject:tabBarButton];
        }
    }
    
    if (index == 0) { //順時(shí)針旋轉(zhuǎn)效果
        CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
        animation.duration = 0.3;
        //如果這里想設(shè)置成一直自旋轉(zhuǎn)刚照，可以設(shè)置為MAXFLOAT宙地，否則設(shè)置具體的數(shù)值則代表執(zhí)行多少次
        animation.repeatCount = 1;
        animation.autoreverses = NO;
        //默認(rèn)是順時(shí)針效果摔认，若將fromValue和toValue的值互換，則為逆時(shí)針效果
        animation.fromValue = [NSNumber numberWithFloat:0.f];
        animation.toValue = [NSNumber numberWithFloat: M_PI *2];
        [[tabbarbuttonArray[index] layer] addAnimation:animation forKey:nil];
        
    }else{ //抖動(dòng)效果
        CABasicAnimation*pulse = [CABasicAnimation animationWithKeyPath:@"transform.scale"];
        pulse.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
        pulse.duration = 0.1;
        pulse.repeatCount = 1;
        pulse.autoreverses = YES;
        pulse.fromValue = [NSNumber numberWithFloat:0.7];
        pulse.toValue = [NSNumber numberWithFloat:1.3];
        [[tabbarbuttonArray[index] layer] addAnimation:pulse forKey:nil];
    }
   
}

//-------------------------------

//在AppDelegate里跟系統(tǒng)的一樣使用
    SLMainTabbarVC *tabbar = [[SLMainTabbarVC alloc] init];
    _tabBarVC = tabbar;
    self.window.rootViewController = tabbar;

特別說(shuō)明：
→1宅粥、由于第一個(gè)tabbar的“雞頭”不能顯示“首頁(yè)”文字参袱，所以我這里的tabbar沒有文字，都是image和title在一起的圖片秽梅，但是要注意抹蚀，此時(shí)的NavigationController的RootViewController的導(dǎo)航文字不要這樣 vc.title = @"首頁(yè)"；設(shè)置企垦，因?yàn)檫@是tabbar的item.title在當(dāng)前VC顯示時(shí)對(duì)應(yīng)的tabbar還是會(huì)顯示 vc.title 的文字环壤。
如果vc的title必須設(shè)置，可以用下面方法代替：

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    UILabel *label = [UILabel new];
    label.frame = CGRectMake(0, 0, 100, 40); //防止有些版本手機(jī)不顯示title的情況钞诡，設(shè)置一個(gè)frame
    label.textAlignment = NSTextAlignmentCenter;
    label.text = @"發(fā)現(xiàn)";  
    label.textColor = [UIColor blackColor];
    label.font = [UIFont systemFontOfSize:17];
    self.navigationItem.titleView = label;
}

→2郑现、item.image和item.image分開的情況時(shí)的做法跟現(xiàn)在的一樣樣，在設(shè)置addChildViewController方法里 vc.tabBarItem.title = titie; 就可以了荧降。此時(shí)的情況本寶寶只試過(guò)抖動(dòng)的效果接箫，別的效果沒有試過(guò)，同學(xué)們可以試著玩玩朵诫，指不定就玩出了別的花樣_{O(∩_∩)O}~

對(duì)于tabar的一些延伸
1辛友、tabBarItem的image&title的改變
要求：在用戶登錄成功后換掉第2個(gè)tabBarItem的image，在SLMainTabbarVC.m 文件里接受通知：

//登錄成功后通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(theLogin) name:LoginSuccessfullNoticetion object:nil];
//方法
-(void)theLogin{
    UITabBarItem *item = [self.tabBar.items objectAtIndex:1];
    item.image = [[UIImage imageNamed:@"tab_2_d_n-"]imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)];
    item.selectedImage = [[UIImage imageNamed:@"tab_2_d_h-"] imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)];
}

//代理方法里
-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
    NSInteger index = [self.tabBar.items indexOfObject:item];
    NSMutableArray * tabbarbuttonArray = [NSMutableArray array];
    for (UIView *tabBarButton in self.tabBar.subviews) {
        if ([tabBarButton isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            [tabbarbuttonArray addObject:tabBarButton];
        }
    }
    
    //item修改了圖片之后剪返，會(huì)影響subviews的順序废累。
    //修改了第二個(gè)的圖片，會(huì)導(dǎo)致第二個(gè)UITabBarButton在subviews變到最后一個(gè)脱盲，所以根據(jù)位置重新排下序
    tabbarbuttonArray = [tabbarbuttonArray sortedArrayUsingComparator:^NSComparisonResult(UIView *obj1, UIView *obj2) {
        NSComparisonResult result = [[NSNumber numberWithFloat:obj1.frame.origin.x] compare:[NSNumber numberWithFloat:obj2.frame.origin.x]];
        return result;
    }];

    //后面內(nèi)容和上面一樣

}