CYLTabBarControllerConfig.m

//
//  CYLTabBarControllerConfig.m
//  CYLTabBarController
//
//  Created by 微博@iOS程序犭袁 ( http://weibo.com/luohanchenyilong/ ) on 10/20/15.
//  Copyright © 2015 https://github.com/ChenYilong . All rights reserved.
//
#import "CYLTabBarControllerConfig.h"

@import Foundation;
@import UIKit;
@interface CYLBaseNavigationController : UINavigationController
@end
@implementation CYLBaseNavigationController

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {
    if (self.viewControllers.count > 0) {
        viewController.hidesBottomBarWhenPushed = YES;
    }
    [super pushViewController:viewController animated:animated];
}

@end

//View Controllers
#import "CYLHomeViewController.h"
#import "CYLMessageViewController.h"
#import "CYLMineViewController.h"
#import "CYLSameCityViewController.h"

@interface CYLTabBarControllerConfig ()

@property (nonatomic, readwrite, strong) CYLTabBarController *tabBarController;

@end

@implementation CYLTabBarControllerConfig

/**
 *  lazy load tabBarController
 *
 *  @return CYLTabBarController
 */
- (CYLTabBarController *)tabBarController {
    if (_tabBarController == nil) {
        CYLHomeViewController *firstViewController = [[CYLHomeViewController alloc] init];
        UIViewController *firstNavigationController = [[CYLBaseNavigationController alloc]
                                                       initWithRootViewController:firstViewController];
        
        CYLSameCityViewController *secondViewController = [[CYLSameCityViewController alloc] init];
        UIViewController *secondNavigationController = [[CYLBaseNavigationController alloc]
                                                        initWithRootViewController:secondViewController];
        
        CYLMessageViewController *thirdViewController = [[CYLMessageViewController alloc] init];
        UIViewController *thirdNavigationController = [[CYLBaseNavigationController alloc]
                                                       initWithRootViewController:thirdViewController];
        
        CYLMineViewController *fourthViewController = [[CYLMineViewController alloc] init];
        UIViewController *fourthNavigationController = [[CYLBaseNavigationController alloc]
                                                        initWithRootViewController:fourthViewController];
        CYLTabBarController *tabBarController = [[CYLTabBarController alloc] init];
        
        // 在`-setViewControllers:`之前设置TabBar的属性，设置TabBarItem的属性，包括 title、Image、selectedImage。
        [self setUpTabBarItemsAttributesForController:tabBarController];
        
        [tabBarController setViewControllers:@[
                                               firstNavigationController,
                                               secondNavigationController,
                                               thirdNavigationController,
                                               fourthNavigationController
                                               ]];
        // 更多TabBar自定义设置：比如：tabBarItem 的选中和不选中文字和背景图片属性、tabbar 背景图片属性
#warning IF YOU DO NOT NEED CUSTOMIZE TABBAR APPEARANCE, ADD THE COMMENT '//'
        [[self class] customizeTabBarAppearance:tabBarController];
        _tabBarController = tabBarController;
    }
    return _tabBarController;
}

/**
 *  在`-setViewControllers:`之前设置TabBar的属性，设置TabBarItem的属性，包括 title、Image、selectedImage。
 */
- (void)setUpTabBarItemsAttributesForController:(CYLTabBarController *)tabBarController {
    
    NSDictionary *dict1 = @{
                            CYLTabBarItemTitle : @"首页",
                            CYLTabBarItemImage : @"home_normal",
                            CYLTabBarItemSelectedImage : @"home_highlight",
                            };
    NSDictionary *dict2 = @{
                            CYLTabBarItemTitle : @"同城",
                            CYLTabBarItemImage : @"mycity_normal",
                            CYLTabBarItemSelectedImage : @"mycity_highlight",
                            };
    NSDictionary *dict3 = @{
                            CYLTabBarItemTitle : @"消息",
                            CYLTabBarItemImage : @"message_normal",
                            CYLTabBarItemSelectedImage : @"message_highlight",
                            };
    NSDictionary *dict4 = @{
                            CYLTabBarItemTitle : @"我的",
                            CYLTabBarItemImage : @"account_normal",
                            CYLTabBarItemSelectedImage : @"account_highlight"
                            };
    NSArray *tabBarItemsAttributes = @[
                                       dict1,
                                       dict2,
                                       dict3,
                                       dict4
                                       ];
    tabBarController.tabBarItemsAttributes = tabBarItemsAttributes;
}

/**
 *  更多TabBar自定义设置：比如：tabBarItem 的选中和不选中文字和背景图片属性、tabbar 背景图片属性
 */
+ (void)customizeTabBarAppearance:(CYLTabBarController *)tabBarController {
    
    // set the text color for unselected state
    // 普通状态下的文字属性
    NSMutableDictionary *normalAttrs = [NSMutableDictionary dictionary];
    normalAttrs[NSForegroundColorAttributeName] = [UIColor grayColor];
    
    // set the text color for selected state
    // 选中状态下的文字属性
    NSMutableDictionary *selectedAttrs = [NSMutableDictionary dictionary];
    selectedAttrs[NSForegroundColorAttributeName] = [UIColor blackColor];
    
    // set the text Attributes
    // 设置文字属性
    UITabBarItem *tabBar = [UITabBarItem appearance];
    [tabBar setTitleTextAttributes:normalAttrs forState:UIControlStateNormal];
    [tabBar setTitleTextAttributes:selectedAttrs forState:UIControlStateSelected];
    
    // Set the dark color to selected tab (the dimmed background)
    // TabBarItem选中后的背景颜色
    //    NSUInteger allItemsInTabBarCount = [CYLTabBarController allItemsInTabBarCount];
    //    [[UITabBar appearance] setSelectionIndicatorImage:[self imageFromColor:[UIColor yellowColor] forSize:CGSizeMake(([UIScreen mainScreen].bounds.size.width - CYLPlusButtonWidth) / (allItemsInTabBarCount - 1), 49.f) withCornerRadius:0]];
    
    // set the bar shadow image
    // This shadow image attribute is ignored if the tab bar does not also have a custom background image.So at least set somthing.
    [[UITabBar appearance] setBackgroundImage:[[UIImage alloc] init]];
    [[UITabBar appearance] setBackgroundColor:[UIColor whiteColor]];
    [[UITabBar appearance] setShadowImage:[UIImage imageNamed:@"tapbar_top_line"]];
    
    // set the bar background image
    // 设置背景图片
    //     UITabBar *tabBarAppearance = [UITabBar appearance];
    //     [tabBarAppearance setBackgroundImage:[UIImage imageNamed:@"tabbar_background"]];
    
    //remove the bar system shadow image
    //去除 TabBar 自带的顶部阴影
    //    [[UITabBar appearance] setShadowImage:[[UIImage alloc] init]];
    
    
}

+ (UIImage *)imageFromColor:(UIColor *)color forSize:(CGSize)size withCornerRadius:(CGFloat)radius {
    CGRect rect = CGRectMake(0, 0, size.width, size.height);
    UIGraphicsBeginImageContext(rect.size);
    
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    // Begin a new image that will be the new image with the rounded corners
    // (here with the size of an UIImageView)
    UIGraphicsBeginImageContext(size);
    
    // Add a clip before drawing anything, in the shape of an rounded rect
    [[UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius] addClip];
    // Draw your image
    [image drawInRect:rect];
    
    // Get the image, here setting the UIImageView image
    image = UIGraphicsGetImageFromCurrentImageContext();
    
    // Lets forget about that we were drawing
    UIGraphicsEndImageContext();
    return image;
}

@end