iOS梦工厂

iCocos——不战胜自己，何以改变未来！

MVVM简单实战篇

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前言

由于之前一直使用MVC，而且在慢慢的开发中确实发现了不少关于MVC中存在的缺陷问题，前段时间试着使用MVVM在项目中去实战一下，发现缺点用着挺爽，他不想MVP那么复杂，也不会像MVC那么高耦合。

所以我打算以后再项目应用中尽量使用MVVM，这里只是简单的整理了一下代码！

M:Model中定义对应的模型属性

@property (nonatomic, copy) NSString *movieName;

@property (nonatomic, copy) NSString *movieTime;

@property (nonatomic, copy) NSString *movieDetail;

@property (nonatomic, strong) NSURL *movieURL;

VM：ViewModel中定义对应的逻辑+数据+回调+代理方法

#import "iCocosModel.h"

typedef void(^resultSuccessBlock)(id resultData);
typedef void(^resultErrorBlock)(id resultError);

@interface iCocosViewModel : NSObject

- (void)getMoviesData;

- (void)moviesDetailWithPublicModel:(iCocosModel *)model withViewController:(UIViewController *)controller;


@property (nonatomic, copy) resultSuccessBlock successBlcok;

@property (nonatomic, copy) resultErrorBlock errorBlcok;


@end

实现对应的方法

#import "iCocosDetailController.h"

@implementation iCocosViewModel

- (void)getMoviesData
{
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

    NSString *url = @"https://api.douban.com/v2/movie/coming_soon";

    [manager GET:url parameters:nil progress:^(NSProgress * _Nonnull downloadProgress) {

    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {

        NSArray *subjects = responseObject[@"subjects"];
        NSMutableArray *modelArr = [NSMutableArray arrayWithCapacity:subjects.count];
        for (NSDictionary *subject in subjects) {
            iCocosModel *model = [[iCocosModel alloc] init];
            model.movieName = subject[@"title"];
            model.movieTime = subject[@"year"];

            NSString *urlStr = subject[@"images"][@"medium"];
            model.movieURL = [NSURL URLWithString:urlStr];
            model.movieDetail = subject[@"alt"];
            [modelArr addObject:model];
        }
        _successBlcok(modelArr);


    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {

    }];
}

- (void)moviesDetailWithPublicModel:(iCocosModel *)model withViewController:(UIViewController *)controller
{
    iCocosDetailController *detailVC = [[iCocosDetailController alloc] init];
    detailVC.url = model.movieDetail;
    [controller.navigationController pushViewController:detailVC animated:YES];
}

@end

V:View+Controller包括视图和控制器

View视图和MVC一样，用模型属性给控件赋值

#import "iCocosModel.h"

@interface iCocosViewCell : UITableViewCell

@property (nonatomic, strong) iCocosModel *model;

@end

View的实现

#import "iCocosViewCell.h"
#import <UIImageView+AFNetworking.h>

@interface iCocosViewCell ()

@property (nonatomic,strong) UILabel *nameLabel;
@property (nonatomic,strong) UILabel *yearLabel;
@property (nonatomic,strong) UIImageView *imgView;

@end


@implementation iCocosViewCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        _imgView = [[UIImageView alloc] initWithFrame:CGRectMake(15, 10, 40, 60)];
        [self.contentView addSubview:_imgView];

        _nameLabel = [[UILabel alloc] initWithFrame:CGRectMake(70, 10, 200, 20)];
        [self.contentView addSubview:_nameLabel];

        _yearLabel = [[UILabel alloc] initWithFrame:CGRectMake(70, 50, 100, 20)];
        _yearLabel.textColor = [UIColor lightGrayColor];
        _yearLabel.font = [UIFont systemFontOfSize:14];
        [self.contentView addSubview:_yearLabel];
    }
    return self;
}

- (void)setModel:(iCocosModel *)model
{
    _model = model;

    _nameLabel.text = _model.movieName;
    _yearLabel.text = _model.movieTime;
    [_imgView setImage:model.movieURL];
}

@end
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