ios weibo 第二天 设置导航栏属性，添加加号按钮

要点：1、在底部添加加号按钮 2、设置导航栏属性

1、weibo底部的button其中四个按钮是一样的，其中中间的加号需要另外做处理

tablebar是自己定义的 ，代码如下

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    // 删除系统自动生成的UITabBarButton
    for (UIView *child in self.tabBar.subviews) {
        if ([child isKindOfClass:[UIControl class]]) {
            [child removeFromSuperview];
        }
    }
}

/**
 *  初始化tabbar
 */
- (void)setupTabbar
{
    IWTabBar *customTabBar = [[IWTabBar alloc] init];
    customTabBar.frame = self.tabBar.bounds;
    customTabBar.delegate = self;
    [self.tabBar addSubview:customTabBar];
    self.customTabBar = customTabBar;
}

 [self.customTabBar addTabBarButtonWithItem:childVc.tabBarItem];

思路：初始化的时候先添加到 IWTabBar中，让其居中，然后再添加其他的

IWTabBar

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        if (!iOS7) { // 非iOS7下,设置tabbar的背景
            self.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithName:@"tabbar_background"]];
        }

        // 添加一个加号按钮
        UIButton *plusButton = [UIButton buttonWithType:UIButtonTypeCustom];
        [plusButton setBackgroundImage:[UIImage imageWithName:@"tabbar_compose_button"] forState:UIControlStateNormal];
        [plusButton setBackgroundImage:[UIImage imageWithName:@"tabbar_compose_button_highlighted"] forState:UIControlStateHighlighted];
        [plusButton setImage:[UIImage imageWithName:@"tabbar_compose_icon_add"] forState:UIControlStateNormal];
        [plusButton setImage:[UIImage imageWithName:@"tabbar_compose_icon_add_highlighted"] forState:UIControlStateHighlighted];
        plusButton.bounds = CGRectMake(0, 0, plusButton.currentBackgroundImage.size.width, plusButton.currentBackgroundImage.size.height);
        [self addSubview:plusButton];
        self.plusButton = plusButton;
    }
    return self;
}

当add bar items 的时候layoutSubviews就会重新算下位置，

- (void)layoutSubviews
{
    [super layoutSubviews];

    // 调整加号按钮的位置
    CGFloat h = self.frame.size.height;
    CGFloat w = self.frame.size.width;
    self.plusButton.center = CGPointMake(w * 0.5, h * 0.5);

    // 按钮的frame数据
    CGFloat buttonH = h;
    CGFloat buttonW = w / self.subviews.count;
    CGFloat buttonY = 0;

    for (int index = 0; index<self.tabBarButtons.count; index++) {
        // 1.取出按钮
        IWTabBarButton *button = self.tabBarButtons[index];

        // 2.设置按钮的frame
        CGFloat buttonX = index * buttonW;
        if (index > 1) {
            buttonX += buttonW;
        }
        button.frame = CGRectMake(buttonX, buttonY, buttonW, buttonH);

        // 3.绑定tag
        button.tag = index;
    }
}

2、设置导航栏属性

内容包括：导航栏的文字属性，rightItem 属性，  pushViewController

思路：设置导航栏的时候不能分个设置，包装成一个类，让这个类管理所有的属性

如何汇总成一个类呢

 // 2.包装一个导航控制器
    IWNavigationController *nav = [[IWNavigationController alloc] initWithRootViewController:childVc];
    [self addChildViewController:nav];

//
//  IWNavigationController.m
//  ItcastWeibo
//
//  Created by apple on 14-5-6.
//  Copyright (c) 2014年 itcast. All rights reserved.
//

#import "IWNavigationController.h"

@interface IWNavigationController ()

@end

@implementation IWNavigationController

/**
 *  第一次使用这个类的时候会调用(1个类只会调用1次)
 */
+ (void)initialize
{
    // 1.设置导航栏主题
    [self setupNavBarTheme];

    // 2.设置导航栏按钮主题
    [self setupBarButtonItemTheme];
}

/**
 *  设置导航栏按钮主题
 */
+ (void)setupBarButtonItemTheme
{
    UIBarButtonItem *item = [UIBarButtonItem appearance];

    // 设置背景
    if (!iOS7) {
        [item setBackgroundImage:[UIImage imageWithName:@"navigationbar_button_background"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
        [item setBackgroundImage:[UIImage imageWithName:@"navigationbar_button_background_pushed"] forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault];
        [item setBackgroundImage:[UIImage imageWithName:@"navigationbar_button_background_disable"] forState:UIControlStateDisabled barMetrics:UIBarMetricsDefault];
    }

    // 设置文字属性
    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
    textAttrs[UITextAttributeTextColor] = iOS7 ? [UIColor orangeColor] : [UIColor grayColor];
    textAttrs[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
    textAttrs[UITextAttributeFont] = [UIFont systemFontOfSize:iOS7 ? 14 : 12];
    [item setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
    [item setTitleTextAttributes:textAttrs forState:UIControlStateHighlighted];
}

/**
 *  设置导航栏主题
 */
+ (void)setupNavBarTheme
{
    // 取出appearance对象
    UINavigationBar *navBar = [UINavigationBar appearance];

    // 设置背景
    if (!iOS7) {
        [navBar setBackgroundImage:[UIImage imageWithName:@"navigationbar_background"] forBarMetrics:UIBarMetricsDefault];
        [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque;
    }

    // 设置标题属性
    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
    textAttrs[UITextAttributeTextColor] = [UIColor blackColor];
    textAttrs[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
    textAttrs[UITextAttributeFont] = [UIFont boldSystemFontOfSize:19];
    [navBar setTitleTextAttributes:textAttrs];
}

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

@end

ios weibo 第二天 设置导航栏属性，添加加号按钮