UITabBarController的创建与自定义TarBar---学习笔记三

代码如下：

#import <UIKit/UIKit.h>

@interface BSJTabBarViewController : UITabBarController

@end
#import "BSJTabBarViewController.h"
#import "BSJTabBar.h"
@interface BSJTabBarViewController ()

@end

@implementation BSJTabBarViewController

#pragma mark --- life cycle
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
//    self.tabBarItem = [UITabBarItem application]
    UITabBarItem *tabBarItem = [UITabBarItem  appearance];
    //未选中的
    NSMutableDictionary *norAttri = [NSMutableDictionary dictionary];
    norAttri[NSFontAttributeName] = [UIFont systemFontOfSize:14];
    norAttri[NSForegroundColorAttributeName] = [UIColor grayColor];
    [tabBarItem setTitleTextAttributes:norAttri forState:UIControlStateNormal];
    //选中的
    NSMutableDictionary *selectAttri = [NSMutableDictionary dictionary];
    selectAttri[NSForegroundColorAttributeName] = [UIColor darkGrayColor];
    [tabBarItem setTitleTextAttributes:norAttri forState:UIControlStateSelected];

    //精华
    [self setupChridViewController:[[UITableViewController alloc] init] title:NSLocalizedString(@"精华", nil) normalImage:@"tabBar_essence_icon" selectedImage:@"tabBar_essence_click_icon"];
    [self setupChridViewController:[[UIViewController alloc] init] title:NSLocalizedString(@"关注", nil) normalImage:@"tabBar_friendTrends_icon" selectedImage:@"tabBar_friendTrends_click_icon"];
    [self setupChridViewController:[[UITableViewController alloc] init] title:NSLocalizedString(@"新帖", nil) normalImage:@"tabBar_new_icon" selectedImage:@"tabBar_new_click_icon"];
    [self setupChridViewController:[[UITableViewController alloc] init] title:NSLocalizedString(@"我", nil) normalImage:@"tabBar_me_icon" selectedImage:@"tabBar_me_click_icon"];
    // 通过KVC，可以改变属性为readOnly,改变它的Key，也就是通过它的value找到它的key
    [self setValue:[[BSJTabBar alloc] init] forKey:@"tabBar"];

}
- (void)setupChridViewController:(UIViewController *)vc title:(NSString *)title normalImage:(NSString *)normalImage   selectedImage:(NSString *)selectedImage{
    vc.title      =  title;
    if (normalImage.length && selectedImage.length ) {
        vc.tabBarItem.image = [UIImage imageNamed:normalImage];
        vc.tabBarItem.selectedImage = [UIImage imageNamed:selectedImage];
    }

    [self addChildViewController:vc];
}

//tabBar 

#import <UIKit/UIKit.h>

@interface BSJTabBar : UITabBar

@end
#import "BSJTabBar.h"
@interface BSJTabBar()
@property (nonatomic, weak)UIButton      *publicButton;

@end
@implementation BSJTabBar

- (void)layoutSubviews{
    [super layoutSubviews];
//    BSJLogFunc
    CGFloat buttonW = self.frame.size.width/5;
    CGFloat buttonH = self.frame.size.height;
    CGFloat buttonY = 0;
    CGFloat i = 0;
    for (UIView *subView in self.subviews) {
        BSJLog(@"%@",NSStringFromClass(subView.class));
//        if (![subView.class isSubclassOfClass:[NSClassFromString(@"UITabBarButton") class]]) continue;
        if (![@"UITabBarButton" isEqualToString:NSStringFromClass(subView.class)]) continue;
        CGFloat buttonX = i*buttonW;
        if (i >= 2) {
            buttonX += buttonW;
        }
        subView.frame = CGRectMake(buttonX, buttonY, buttonW, buttonH);

        i++;
   }

//        [

self.publicButton setFrame:CGRectMake(0, 0, self.frame.size.width/5, self.frame.size.height)]; //

self.publicButton.center = CGPointMake(self.center.x, self.center.y);

} #pragma mark --- response methods - (void)buttonClick:(UIButton *)sender{ } 

#pragma mark --- setters and getters - (UIButton *)publicButton{ if (!_publicButton) { UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; [button setImage:[UIImage imageNamed:@"tabBar_publish_icon"] forState:UIControlStateNormal]; [button setImage:[UIImage imageNamed:@"tabBar_publish_click_icon"] forState:UIControlStateHighlighted]; [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];  [self addSubview:button]; _publicButton = button; } return _publicButton; } @end