iOS 之MVP设计模式(OC)

闲来无事，研究了下IOS的MVP设计架构,分享下自己的感悟,说的不对的地方还请各位大神不吝指教
首先上一张图:

3096256-6c10a494d89a58d6.jpg

1 . 概念:"MVP"中的M指的是model,"V"指的是UIViewController以及UIView,"P"指的是"Present",
MVP解耦的关键在于将传统的UIViewController部分业务逻辑交由"Present"处理,比如网络请求,用户的操作行为,

2. "MPV"如何解耦以及与他们三者之间是如何通信的呢?
   "Present"一方面通过Service层调用接口获取数据给Model层,

 [_userService getUserInfosSuccess:^(NSDictionary *dic) {
        [self.attachView hideIndicator];
        NSArray *userArr = [dic valueForKey:@"data"];
        
        if ([self processOriginDataToUIFriendlyData:userArr].count == 0) {
            [self.attachView showEmptyView];
        }
        [self.attachView userViewDataSource:[self processOriginDataToUIFriendlyData:userArr]];
    } andFail:^(NSDictionary *dic) {
        
    }];
- (NSArray<UserModel *> *)processOriginDataToUIFriendlyData:(NSArray *)originData {
    NSMutableArray<UserModel *> *friendlyUIData = [NSMutableArray array];
    for (NSDictionary *dic in originData) {
        if ([[dic valueForKey:@"gender"] isEqualToString:@"male"]) {
            UserModel *model = [UserModel userWithDict:dic];
            [friendlyUIData addObject:model];
        }
    }
    return friendlyUIData;
}

然后又以协议的方式

 [self.attachView userViewDataSource:[self processOriginDataToUIFriendlyData:userArr]];

将数据传给UIViewController

#pragma mark - UserViewProtocol
- (void)userViewDataSource:(NSArray<UserModel *> *)data {
    self.friendlyUIData = data;
    [self.tableView reloadData];
}

从而实现"Present"层向"V"层通信的机制,同时"V"层的控制器UIViewController通过添加"Present"对象

- (Presenter *)presenter {
    if (_presenter == nil) {
        _presenter = [[Presenter alloc] init];
        [_presenter attachView:self];
    }
    return _presenter;
}

实现"V"层向"Present"层通信,因此我们可以看出"V"层和"Present"是双向通信,而"P"即"Present"则通过请求数据赋值给Model来实现"P"层和"M"层通信,

3. 用户的一些业务逻辑和操作全部交由"Present"去操作,而Present又是通过协议的方式

@interface Presenter()

@property (nonatomic,strong) UserService *userService;

@property (nonatomic, weak) id<UserViewProtocol> attachView;

@end
#import "UserModel.h"

@protocol UserViewProtocol <NSObject>

- (void)userViewDataSource:(NSArray<UserModel *> *)data;

- (void)showIndicator;

- (void)hideIndicator;

- (void)showEmptyView;

去响应用户的操作,具体的协议操作也是在“V”即Controller层实现

#pragma mark - UserViewProtocol
- (void)userViewDataSource:(NSArray<UserModel *> *)data {
    self.friendlyUIData = data;
    [self.tableView reloadData];
}

- (void)showIndicator {
    [self.indicatorView startAnimating];
    self.indicatorView.hidden = NO;
}

- (void)hideIndicator {
    [self.indicatorView stopAnimating];
}