BaseViewController设计、统一管理Push

Contents

1. 1. 在BaseViewController提供一个统一使用push viewController的方法，来统一管理控制器压栈.
   1. 1.1. BaseViewController.h
   2. 1.2. BaseViewController.m
2. 2. 这样做的好处
3. 3. 自定义一个UINavigationController也可以完成导航栏按钮、导航栏输入框..等等的差异化样式or统一样式

在BaseViewController提供一个统一使用push viewController的方法，来统一管理控制器压栈.

BaseViewController.h

• 每一个ViewController对应一个唯一的Id

typedef NS_ENUM(NSInteger, ZSYViewControllerId) {
ZSYHomePage                         = 1,
ZSYCustomerRegistAndLogin ,
ZSYCustomerLogin ,
ZSYCustomerRegist ,
ZSYCustomerFindPwd ,
ZSYCustomerIdentiVery ,
//...
}

• 给子类ViewController提供的push方法

- (id)pushWithControllerId:(ZSYViewControllerId)controllerId
isAnimate:(BOOL)isAnimate;

- (id)pushWithControllerId:(ZSYViewControllerId)controllerId
Title:(NSString *)title
Argument:(NSDictionary *)argument
isAnimate:(BOOL)isAnimate;

BaseViewController.m

• 每一个定义的controllerId对应的className定义

static NSString *const kCustomerLoginAndRegistViewClassName     = @"ZSYCustomerLoginAndRegistViewController";
static NSString *const kCustomerLoginViewClassName              = @"ZSYCustomerLoginViewController";
static NSString *const kCustomerRegistViewClassName             = @"ZSYCustomerRegistViewController";
static NSString *const kCustomerFindPwdViewClassName            = @"ZSYCustomerFindPwdViewController";

• push 方法的实现

- (id)pushWithControllerId:(ZSYViewControllerId)controllerId
isAnimate:(BOOL)isAnimate
{
return [self pushWithControllerId:controllerId
Title:nil
Argument:nil
isAnimate:isAnimate];
}

- (id)pushWithControllerId:(ZSYViewControllerId)controllerId
Title:(NSString *)title
Argument:(NSDictionary *)argument
isAnimate:(BOOL)isAnimate {

NSString *className = nil;
id vcInstance = nil;

//1. 获取controllerId对应的className（比如，我们让ZSYHomePage对应@"ZSYHomePage_RootViewController"）
className = [ZSYBaseViewController viewControllerclassNameById:controllerId];

//2. 获取当前ViewController实例的，自定义NavigationController实例
ZSYBaseNavController *nav = [self findNavigationControllerByCurrentVC];

//3. 从找到的的NavigationController的viewController栈中查找，是否已经有这个类的实例
UIViewController *findVC = [nav pushToViewController:NSClassFromString(className)
Animated:isAnimate];

//4. 如果存在，直接返回找到的viewController实例
if (findVC) {

//5. 并填充传入的属性值
[ZSYBaseViewController p_fillArgumentForInstance:findVC
arguments:argument
title:title];
return findVC;
}

//-------------- 如下从栈内未找到ViewController实例的情况 --------------

//6. 如果是登陆，直接present 不用 push
if (controllerId == ZSYCustomerRegistAndLogin) {
vcInstance = [self handleWhenControllerIdIsLoginModules:className
Argument:argument
Tiltle:title
isAnimate:isAnimate];

return vcInstance;
}

//7. 前面情况都不符合，那么就创建一个实例，并完成差异化创建NavigationBarItem
vcInstance = [self createNormalViewControllerInstanceExcludeLoginModolesWithControllerId:controllerId
ClassName:className];

//7. 填充实例的属性值（使用KVC）
vcInstance = [ZSYBaseViewController p_fillArgumentForInstance:vcInstance
arguments:argument
title:title];

//8. 如果创建失败，返回nil
if (!vcInstance) {
return nil;
}

//9. 调用UINavigationController的push方法
[nav pushViewController:vcInstance animated:isAnimate];

return vcInstance;
}

• 查找controllerId对应的className

+ (NSString *)viewControllerclassNameById:(ZSYViewControllerId)controllerId {

NSString *className = @"";

switch (controllerId) {

case ZSYHomePage: {
className = kHomePageRootViewClassName;
break;
}

case ZSYCustomerRegistAndLogin: {
className = kCustomerLoginAndRegistViewClassName;
break;
}

case ZSYCustomerLogin: {
className = kCustomerLoginViewClassName;
break;
}

case ZSYCustomerRegist: {
className = kCustomerRegistViewClassName;
break;
}

case ZSYCustomerFindPwd: {
className = kCustomerFindPwdViewClassName;
break;
}

//..省略

}

return className;
}

• 查找当前控制器所在的导航栈（UINavigationController是自己定义的）

- (ZSYBaseNavController *)findNavigationControllerByCurrentVC {

ZSYBaseNavController *nav = nil;

if (self.navigationController) {
if ([self.navigationController isKindOfClass:[ZSYBaseNavController class]]) {
nav = (ZSYBaseNavController*)self.navigationController;
}
}

return nav;
}

• 填充控制器需要的属性值，使用的一个第三方KVC框架

+ (id)p_fillArgumentForInstance:(id)instance
arguments:(NSDictionary *)argument
title:(NSString *)title
{
if (title) {
[instance setTitle:title];
}

if (argument) {
@try {
[instance mts_setValuesForKeysWithDictionary:argument];
}
@catch (NSException *exception) {
DLog(@"%@ 设置 %@ 出错!\n", instance, argument);
}
}
return instance;
}

• 如果当前要跳转的是登陆控制器就使用 presneViewControlelr:

- (id)handleWhenControllerIdIsLoginModules:(NSString *)className
Argument:(NSDictionary *)argument
Tiltle:(NSString *)title
isAnimate:(BOOL)isAnimate
{

id vcInstance = nil;

vcInstance = [self createLoginModulesInstance:className
animated:isAnimate];

vcInstance = [ZSYBaseViewController p_fillArgumentForInstance:vcInstance
arguments:argument
title:title];

return vcInstance;
}

- (id)createLoginModulesInstance:(NSString *)className
animated:(BOOL)animated
{

id retVal = nil;
Class myClass = NSClassFromString(className);

if ([[[self class] presentingVC] isKindOfClass:myClass]) {
return [[self class] presentingVC];
}

if ([self p_isLoginModule]) {//push

retVal = [[myClass alloc] _initWithRightNone];
[self.navigationController pushViewController:retVal animated:animated];

} else {//present

retVal = [[myClass alloc] _initWithCloseButton];
[ZSYBaseViewController presentVC:retVal];

}

return retVal;
}

• 完成差异化创建NavigationBarButtonItem，来决定UINavigationBarButton的显示样式

- (id)createNormalViewControllerInstanceExcludeLoginModolesWithControllerId:(ZSYViewControllerId)controllerId
ClassName:(NSString *)className
{
id instance = nil;

if ([className isEqualToString:className1]) {

//实例化右侧按钮 - 地图
instance = [[NSClassFromString(className) alloc] _initWithMapButton];

} else if ([className isEqualToString:className2]) {

//实例化右侧按钮 - 关于我们
instance = [[NSClassFromString(className) alloc] _initWithAoutUsButton];

} else if ([className isEqualToString:className3]) {

//实例化右侧按钮 - 搜索
instance = [[NSClassFromString(className) alloc] _initWithSearchButton];

} else  {

//实例化右侧按钮 - 什么也没有
instance = [[NSClassFromString(className) alloc] _initWithUseNone];

}

return instance;    
}

- (ZSYBaseViewController *)_initWithRightNone {
self = [super init];
if (self) {
//不做神马....
}
return self;
}

- (ZSYBaseViewController *)_initWithUseButton {
self = [super init];

if (self) {
UIBarButtonItem *item = [UIBarButtonItem createNormalButtonItemWithTitle:@"权益使用"
Target:self
Selector:@selector(useButtonClick:)];
[self.navigationItem setRightBarButtonItem:item];
}

return self;
}

- (ZSYBaseViewController *)_initWithAboutButton {
self = [super init];
if (self) {
UIBarButtonItem *item = [UIBarButtonItem createNormalButtonItemWithTitle:@"关于"
Target:self
Selector:@selector(aboutButtomClick:)];
[self.navigationItem setRightBarButtonItem:item];
}
return self;
}

- (ZSYBaseViewController *)_initWithCloseButton {
self = [super init];
if (self) {
UIBarButtonItem *close = [UIBarButtonItem createGoBackViewControllerButtonItemWithTarget:self
Selector:@selector(closeButtonClick:)];
[self.navigationItem setLeftBarButtonItem:close];
}
return self;
}

- (void)useButtonClick:(id)sender {
[self pushWithControllerId:ZSYXFXTBenefitUse isAnimate:YES];
}

- (void)aboutButtomClick:(id)sender {

}

- (void)closeButtonClick:(id)sender {

BOOL isNeedForWardToHomePage = [self isForwardToHomePage];

[self dismissViewControllerAnimated:YES completion:nil];

if (isNeedForWardToHomePage) {
[[APP_DELEGATE contentVC] popAllToRootViewControllerAnimated:NO];

// CJT:此句代码应该放入到这个位置
ZSYBaseNavController *nav = (ZSYBaseNavController *)[APP_DELEGATE contentVC].selectedViewController;
[nav removeCaptureViewWhenLoginExpirateViewClickClose];
}
}

• 还可以继续添加不同控制器的navigationBar进行差异化添加不同的UI（搜索栏、下拉框、标题栏…）

• 通过修改ViewController实例的navigationItem模型实例的属性

//1. 创建一个输入框
//..

//2. 
self.navigationItem.titleView = 输入框;

---

这样做的好处

• 防止push死循环

• ViewController实例，统一在一个地方完成创建

• 可以在一个地方来完成，对不同的ViewController的导航栏按钮差异化、或者其他的UI差异化设置

• 使用一个Id来代替一个ClassName，外界使用push时，只是使用了一个枚举值Controllerid而并不知道具体使用的是哪一个ViewController Class，从而达到解耦

---

自定义一个UINavigationController也可以完成导航栏按钮、导航栏输入框..等等的差异化样式or统一样式

• 定义一个UINavigationController，重写父类的各种系统方法，来完成我们自己操作之后，再让父类的代码继续执行

@interface ZSYBaseNavController : UINavigationController

@end

@implementation ZSYBaseNavController

- (void)viewDidLoad {
[super viewDidLoad];

//设置UINavigationControllerDelegate为ZSYBaseNavController实例
self.delegate = self;

}

#pragma mark - UINavigationControllerDelegate

- (void)navigationController:(UINavigationController *)navigationController
willShowViewController:(UIViewController *)viewController
animated:(BOOL)animated 
{

}   

- (void)navigationController:(UINavigationController *)navigationController
didShowViewController:(UIViewController *)viewController
animated:(BOOL)animated 
{                 

}

#pragma mark - 重写系统方法，进行拦截

//拦截pushViewController方法
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated 
{
//1. 做点什么
//...

//2, 执行父类的push操作
[super pushViewController:viewController animated:animated];
}

//拦截popToViewController操作
- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated 
{
//1. 做点什么
//...

//2, 执行父类的pop操作
return [super popToViewController:viewController animated:animated];
}

//拦截popToRootViewControllerAnimated操作
- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated 
{
//1. 做点什么
//...

//2, 执行父类的pop操作
return [super popToRootViewControllerAnimated:animated];
}

//拦截popViewControllerAnimated操作
- (UIViewController *)popViewControllerAnimated:(BOOL)animated 
{
//1. 做点什么
//...

//2, 执行父类的pop操作    
return [super popViewControllerAnimated:animated];
}

//拦截setViewControllers操作
- (void)setViewControllers:(NSArray *)viewControllers animated:(BOOL)animated 
{
//1. 做点什么
//...

//2, 执行父类的set操作
[super setViewControllers:viewControllers animated:animated];
}

@end

• 可以重写如上的pushViewController:animated:方法，完成差异化导航栏UI、各种UI设置

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {

//1. 给当前push的viewController实例
// 添加左侧导航按钮、有导航按钮、中间的导航输入框
//..

//2.    
[super pushViewController:viewController animated:animated];
}

• 仍然重写pushViewController:animated:方法，来完成系统TabBarConttroller是否隐藏tabBar

- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated {

//1. 判断push的viewController实例是不是rootVC
if (self.veiwControllers.count > 1) {

//不是root viewController，那么添加设置自动隐藏tabBar的设置
viewController.hidesBottomBarWhenPushed = YES;
}

//2. 执行父类的push代码  
[super pushViewController:viewController animated:animated];