分离tableView的datasource
将datasource单独分离出来，为view controller减轻代码量
- 方式一：通过block处理cell
- 方式二：通过delegate处理cell
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@protocol PhotoDelegate;
typedef void (^PhotoViewCellConfigureBlock)(id cell,id item) ;
@interface PhotoDataSource : NSObject <UITableViewDataSource>
@property (nonatomic, weak) id<PhotoDelegate> delegate;
- (instancetype)initWithItem:(id)item
cellIdentifier:(NSString *)identifier
configurePhotoCellBlock:(PhotoViewCellConfigureBlock)configureBlock;
@end
@protocol PhotoDelegate <NSObject>
@required
- (void)tableViewCell:(UITableViewCell *)cell item:(id)item;
@end
#import "PhotoDataSource.h"
@interface PhotoDataSource ()
@property (nonatomic, strong) NSArray *items;
@property (nonatomic, strong) NSString *identifier;
@property (nonatomic, strong) PhotoViewCellConfigureBlock photoCellBlock;
@end
@implementation PhotoDataSource
- (instancetype)init
{
return nil;
}
- (instancetype)initWithItem:(NSArray *) items
cellIdentifier:(NSString *)identifier
configurePhotoCellBlock:(PhotoViewCellConfigureBlock)configureBlock
{
self = [super init];
if (self) {
self.items = items;
self.identifier = identifier;
self.photoCellBlock = configureBlock;
}
return self;
}
- (id)itemAtIndexPath:(NSIndexPath *) indexPath
{
return self.items[indexPath.row];
}
#pragma mark -
#pragma mark TableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(nonnull UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(nonnull UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.items.count;
}
- (nonnull UITableViewCell *)tableView:(nonnull UITableView *)tableView
cellForRowAtIndexPath:(nonnull NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:self.identifier forIndexPath:indexPath];
id item = [self itemAtIndexPath:indexPath];
//self.photoCellBlock(cell,item);
[self.delegate tableViewCell:cell item:item];
return cell;
}
@end
#import "ViewController.h"
#import "PhotoDataSource.h"
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,PhotoDelegate>
@property (nonatomic, strong) PhotoDataSource * photoDataSource;
@property (nonatomic, strong) NSArray *items;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.items = @[@"are you ok", @"I am ok", @"what is your name?", @"Thank you"];
[self.tableView registerClass:[UITableViewCell class]
forCellReuseIdentifier:@"PhotoCell"];
[self setupPhotoDataSource];
}
- (void)setupPhotoDataSource
{
PhotoViewCellConfigureBlock photoBlock = ^(UITableViewCell * cell, NSString *text)
{
cell.textLabel.text = text;
};
self.photoDataSource = [[PhotoDataSource alloc] initWithItem:self.items
cellIdentifier:@"PhotoCell"
configurePhotoCellBlock:photoBlock];
self.photoDataSource.delegate = self;
self.tableView.dataSource = self.photoDataSource;
self.tableView.delegate = self;
}
#pragma mark - talkingDelegate
- (void)tableViewCell:(UITableViewCell *)cell item:(id)item
{
cell.textLabel.text = item;
cell.imageView.image = [UIImage imageNamed:@"test.jpg"];
}
@end
将业务逻辑移到 Model 中
即将与model有关的业务逻辑通过分类或者直接在model中直接代替实现，减轻view controller的代码量
将网络请求移到 Model 中
将网络请求移动model层，封装在一个类中，后面view controller就可以通过回调来请求网络了。好处在于缓存和错误控制也可以在这个类里面实现
把 View 代码移到 View 层
不应该在view controller中构建复杂的view,而应该单独将view分隔出来使用，更加简洁明了
