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:selectAttri 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