MVP-架构分析

MVC跟MVP的区别以及使用的优缺点？
MVC:View和控制器耦合性强
MVP:面向协议，View和Model完全解耦，获取数据(网络遵循协议拿数据，Controller层不显示网络请求数据的过程,只要遵循协议就能拿到数据)

UserPresenter层

#import <Foundation/Foundation.h>
#import "User.h"
@interface UserViewData : NSObject
/** 名字 */
@property (nonatomic, strong) NSString * name ;
/** 年龄 */
@property (nonatomic, strong) NSString * age ;
- (instancetype)initWithName:(NSString*)name age:(NSString*)age;
@end


NS_ASSUME_NONNULL_BEGIN
@protocol UserViewDelegate <NSObject>

- (void)startLoading;
- (void)finishLoading;

//用户界面的数据
- (void)setUsers:(NSArray<UserViewData *> *)userViewData;
//数据是空的时候显示
- (void)setEmptyUsers;
@end

@interface UserPresenter : NSObject
@property (nonatomic, weak) id<UserViewDelegate> delegate ;
- (void)getUsers;
@end

NS_ASSUME_NONNULL_END

#import "UserPresenter.h"

@implementation UserViewData
- (instancetype)initWithName:(NSString*)name age:(NSString*)age
{
    self = [super init];
    if (self) {
        self.name = name;
        self.age = age;
    }
    return self;
}
@end

@implementation UserPresenter
-(void)getUsers {
    __weak typeof(self) weakSelf = self;
    [User getUsers:^(NSArray<User *> * _Nonnull users) {
        [weakSelf.delegate finishLoading];
        BOOL hasUser = users && users.count;
        if (!hasUser) {
            [weakSelf.delegate setEmptyUsers];
        }else {
            NSMutableArray<UserViewData *> *userViewDatas = [NSMutableArray arrayWithCapacity:11];
            for (User * user in users) {
                NSString * ageStr = [NSString stringWithFormat:@"年龄%zd",user.age];
                UserViewData * userViewData = [[UserViewData alloc] initWithName:user.firstName age:ageStr];
                [userViewDatas addObject:userViewData];
            }
            if ([self.delegate respondsToSelector:@selector(setUsers:)]) {
                [self.delegate setUsers:userViewDatas];
            }
        }
    }];
}
@end

使用：

#import "ViewController.h"
#import "User.h"
#import "UserPresenter.h"
@interface ViewController ()<UITableViewDataSource,UserViewDelegate>
/** TableView */
@property (nonatomic, strong) UITableView * tableView ;
/** 指示器 */
@property (nonatomic, strong) UIActivityIndicatorView * indicator ;
/** 空白占位 */
@property (nonatomic, strong) UIView * emptyView ;
/** Protocol */
@property (nonatomic, strong) UserPresenter * userPresenter ;
/** 数据源 */
@property (nonatomic, strong) NSArray<UserViewData*> * userViewDatas ;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    [self setupUI];
    [self loadData];
}

- (void)setupUI {
    
    _tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    [self.view addSubview:_tableView];
    _tableView.dataSource = self;
}

- (void)loadData {
    self.userPresenter = [[UserPresenter alloc] init];
    self.userPresenter.delegate = self;
    [self.userPresenter getUsers];
}

#pragma mark - UserViewDelegate

-(void)startLoading {
    self.indicator.hidden = NO;
    [self.indicator startAnimating];
}

- (void)finishLoading {
    [self.indicator stopAnimating];
    self.indicator.hidden = YES;
}

//用户界面的数据
-(void)setUsers:(NSArray<UserViewData *> *)userViewData {
    self.userViewDatas = userViewData;
    self.tableView.hidden = NO;
    self.emptyView.hidden = YES;
    [self.tableView reloadData];
}

//数据是空的时候显示
-(void)setEmptyUsers {
    self.emptyView.hidden = NO;
    self.tableView.hidden = YES;
    self.indicator.hidden = YES;
}
#pragma mark - 数据源方法
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.userViewDatas.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString * cellID=@"cellID";
    UITableViewCell * cell=[tableView dequeueReusableCellWithIdentifier:cellID];
    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:cellID];
    }
    UserViewData *userViewData = self.userViewDatas[indexPath.row];
    cell.textLabel.text = userViewData.name;
    cell.detailTextLabel.text = userViewData.age;
    return cell;
}
@end