iOS更改tabbar圖片渲染 —不讓tabbat有藍色的渲染 並修改文字，

iOS更改tabbar圖片渲染 —不讓tabbat有藍色的渲染 並修改文字，
方式一 代碼實現 這種要寫很多代碼 ，每個控制器都要寫  UIImage *image=[UIImage imageNamed:@"tabBar_friendTrends_click_icon"];//    不讓tabbar底部有渲染的關鍵代碼     image=[image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    vc01.tabBarItem.selectedImage=image; 更改tabbar下方的文字樣式，大小， 顏色  NSMutableDictionary *atts=[NSMutableDictionary dictionary];// 更改文字大小    atts[NSFontAttributeName]=[UIFont systemFontOfSize:12];// 更改文字顏色    atts[NSForegroundColorAttributeName]=[UIColor darkGrayColor];     NSMutableDictionary *selectedAtts=[NSMutableDictionary dictionary];
    selectedAtts[NSFontAttributeName]=[UIFont systemFontOfSize:12];
    selectedAtts[NSForegroundColorAttributeName]=[UIColor greenColor];    [vc01.tabBarItem setTitleTextAttributes:selectedAtts forState:UIControlStateSelected];  方式二   在 Assets.xcassets檔案夾中更改 改變之後不用代碼  並且在所有的控制器裡面都會被作用到具體操作 appearance屬性//    通過appearance統一設定所有的UITabBarItem的文字屬性//    後面帶有UI_APPEARANCE_SELECTOR的方法，都可以通過appearance同意設定例如UITabBarItem的文字屬性案例； 
    NSMutableDictionary *atts=[NSMutableDictionary dictionary];
    atts[NSFontAttributeName]=[UIFont systemFontOfSize:12];
    atts[NSForegroundColorAttributeName]=[UIColor grayColor];
   
    NSMutableDictionary *selectedAtts=[NSMutableDictionary dictionary];
    selectedAtts[NSFontAttributeName]=atts[NSFontAttributeName];    selectedAtts[NSForegroundColorAttributeName]=[UIColor darkGrayColor];// 在這裡 只要更改，所有的文字都改     UITabBarItem *item=[UITabBarItem appearance];
    [item setTitleTextAttributes:atts forState:UIControlStateNormal];
    [item setTitleTextAttributes:selectedAtts forState:UIControlStateSelected];
   
    //    添加子控制器
    UIViewController *vc01=[[UIViewController alloc]init];
    vc01.view.backgroundColor=[UIColor redColor];
    vc01.tabBarItem.title=@"精華";
    vc01.tabBarItem.image=[UIImage imageNamed:@"tabBar_essence_icon"];
    UIImage *image=[UIImage imageNamed:@"tabBar_friendTrends_click_icon"];
//    不讓tabbar底部有渲染的關鍵代碼     image=[image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    vc01.tabBarItem.selectedImage=image;// 把控制器 添加到 UITabBarController裡面去    [self addChildViewController:vc01];   
    UIViewController *vc02=[[UIViewController alloc]init];
    vc02.tabBarItem.title=@"新帖";
    vc02.tabBarItem.image=[UIImage imageNamed:@"tabBar_new_click_icon"];
    vc02.tabBarItem.selectedImage=[UIImage imageNamed:@"tabBar_new_click_icon"];
    vc02.view.backgroundColor=[UIColor cyanColor];
    [self addChildViewController:vc02];
   
    UIViewController *vc03=[[UIViewController alloc]init];
    vc03.view.backgroundColor=[UIColor blueColor];
    vc03.tabBarItem.title=@"關注";
    vc03.tabBarItem.image=[UIImage imageNamed:@"tabBar_friendTrends_icon"];
    vc03.tabBarItem.selectedImage=[UIImage imageNamed:@"tabBar_friendTrends_click_icon"];
    [self addChildViewController:vc03];
   
    UIViewController *vc04=[[UIViewController alloc]init];
    vc04.tabBarItem.title=@"我";
    vc04.tabBarItem.image=[UIImage imageNamed:@"tabBar_me_icon"];
    vc04.tabBarItem.selectedImage=[UIImage imageNamed:@"tabBar_me_click_icon"];
    vc04.view.backgroundColor=[UIColor yellowColor];    [self addChildViewController:vc04];