动态加载视图

步骤

  1. 获取JSON文件路径
  2. 根据路径创建NSData对象
  3. 根据NSData对象对JSON进行序列化,得到一个数组
  4. 遍历数组,提取出视图名,标题,图片名,根据这三项创建视图,并用UINavigationViewController包裹起来,将navi添加到tabBarViewController中.

    MainVCSettings.json文件

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    [
    {
    "vcName": "HomeTableViewController",
    "title": "首页",
    "imageName": "tabbar_home"
    },
    {
    "vcName": "MessageTableViewController",
    "title": "消息",
    "imageName": "tabbar_message_center"
    },
    {
    "vcName": "NullViewController",
    "title": "",
    "imageName": ""
    },
    {
    "vcName": "DiscoverTableViewController",
    "title": "广场",
    "imageName": "tabbar_discover"
    },
    {
    "vcName": "ProfileTableViewController",
    "title": "我",
    "imageName": "tabbar_profile"
    }
    ]

具体实现代码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
//
// MainViewController.swift
// weibo
//
// Created by Adrift on 16/6/5.
// Copyright © 2016年 Adrift. All rights reserved.
//

import UIKit

class MainViewController: UITabBarController {

//MARK: - 生命周期
override func viewDidLoad() {
super.viewDidLoad()
//设置当前控制器对应的tabBar的颜色,iOS7之前如果设置了tintClor只有文字会变,而图片不会变
tabBar.tintColor = UIColor.orangeColor()
addChildViewControllers()
}

override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true)
tabBar.addSubview(composeBtn)
//计算宽度
let width = UIScreen.mainScreen().bounds.width / CGFloat(viewControllers!.count)
//创建 frame
let rect = CGRect(x: 0, y: 0, width: width, height: tabBar.bounds.height)
//设置 frame 跟 偏移量
composeBtn.frame = CGRectOffset(rect, width * 2, 0)

}

//MARK: - 方法
/**
添加所有子控制器
*/
func addChildViewControllers() {
//获取json文件路径
let path = NSBundle.mainBundle().pathForResource("MainVCSettings", ofType: "json")
//通过文件路径创建NSData
if let tempPath = path {
let jsonData = NSData(contentsOfFile: tempPath)
do {
//序列化
let dictArr = try NSJSONSerialization.JSONObjectWithData(jsonData!, options: NSJSONReadingOptions.MutableContainers) as! [[String: String]]
//遍历数组,并创建视图控制器
for dict in dictArr {
addChildViewController(dict["vcName"]!, title: dict["title"]!, imageName: dict["imageName"]!)
}
}catch{
print("crash")
//并添加到TabBarViewController
addChildViewController("HomeTableViewController", title: "首页", imageName: "tabbar_home")
addChildViewController("MessageTableViewController", title: "消息", imageName: "tabbar_message_center")
addChildViewController("NullViewController", title: "", imageName: "")
addChildViewController("DiscoverTableViewController", title: "发现", imageName: "tabbar_discover")
addChildViewController("ProfileTableViewController", title: "我的", imageName: "tabbar_profile")
}
}
}

/**
将navigationViewController 添加到 TabBarViewController

- parameter childController: 子控制图
- parameter title: 标题
- parameter imageName: 非高亮图片名称
*/
private func addChildViewController(childControllerName: String, title: String, imageName: String) {
//获取命名空间
let speaceName = NSBundle.mainBundle().infoDictionary!["CFBundleExecutable"] as! String

//通过字符串转换为类
let cls:AnyClass? = NSClassFromString(speaceName + "." + childControllerName)

//通过类创建对象
let vcCls = cls as! UIViewController.Type
let vc = vcCls.init()

// 设置首页
vc.tabBarItem.image = UIImage(named: imageName)
vc.tabBarItem.selectedImage = UIImage(named: imageName + "_highlighted")
vc.title = title
//2.给首页包装一个导航器
let navi = UINavigationController()
navi.addChildViewController(vc)
//3.将导航控制器添加到当前控制器
addChildViewController(navi)
}

func composeBtnClick() {
print("被点击...")
}

//MARK: - 懒加载
private lazy var composeBtn:UIButton = {

let button = UIButton()

//设置button图片
button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)

//设置button背景图片
button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)

//添加监听事件
button.addTarget(self, action: #selector(MainViewController.composeBtnClick), forControlEvents: UIControlEvents.TouchUpInside)

return button
}()
}

–EOF–