LighterViewController

slim down your view controller

Clean Table View Code https://www.objc.io/issues/1-view-controllers/table-views/

https://www.objc.io/issues/1-view-controllers/lighter-view-controllers/

更轻量的 view Controller http://objccn.io/issue-1-1/

更整洁的 tableView代码 http://objccn.io/issue-1-2/

Controller不是tableview的垃圾桶 http://www.cocoachina.com/ios/20151215/14697.html

PhotosViewController

- (void)setupTableView {

TableViewCellConfigureBlock configureCell = ^(PhotoCell *cell, Photo *photo){
    [cell configureForPhoto:photo];
};

NSArray *photos = [AppDelegate sharedDelegate].store.sortedPhotos;
_photosArrayDataSource = [[ArrayDataSource alloc] initWithItems:photos
                                                 cellIdentifier:PhotoCellIdentifier
                                             configureCellBlock:configureCell];
self.tableView.dataSource = _photosArrayDataSource;
[self.tableView registerNib:[PhotoCell nib] forCellReuseIdentifier:PhotoCellIdentifier];
}

ArrayDataSource

- (instancetype)init {
	return nil;
}

- (instancetype)initWithItems:(NSArray *)anItems
		   	    cellIdentifier:(NSString *)aCellIdentifier
 			configureCellBlock:(TableViewCellConfigureBlock)aConfigureCellBlock {

	self = [super init];
	if (self) {
	    _items = anItems;
    	_cellIdentifier = aCellIdentifier;
    	_configureCellBlock = [aConfigureCellBlock copy];
	}
	return self;
}

- (instancetype)itemAtIndexPath:(NSIndexPath *)indexPath {
	return _items[indexPath.row];
}



- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
	return self.items.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

	UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:_cellIdentifier
                                                        forIndexPath:indexPath];
	id item = [self itemAtIndexPath:indexPath];
	_configureCellBlock(cell, item);
	return cell;
}

PhotoCell

+ (UINib *)nib {
	return [UINib nibWithNibName:@"PhotoCell" bundle:nil];
}

- (void)configureForPhoto:(Photo *)photo {
	_photoTitleLabel.text = photo.name;
	_photoDateLabel.text = [self.dateFormatter stringFromDate:photo.creationDate];
}

Handling Multiple Cell Types

- (UITableViewCell *)tableView:(UITableView *)tableView  
     cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
	NSString *key = self.keys[(NSUInteger) indexPath.row];
	id value = [self.photo valueForKey:key];
	UITableViewCell *cell;
	if ([key isEqual:PhotoRatingKey]) {
    	cell = [self cellForRating:value indexPath:indexPath];
	} else {
    	cell = [self detailCellForKey:key value:value];
	}
	return cell;
}

- (RatingCell *)cellForRating:(NSNumber *)rating
                	 indexPath:(NSIndexPath *)indexPath
{
  // ...
}

- (UITableViewCell *)detailCellForKey:(NSString *)key
                            value:(id)value
{
	// ...
}

把网络请求逻辑移到 Model 层

不要在 view controller 中做网络请求的逻辑。取而代之，你应该将它们封装到另一个类中。这样，你的 view controller 就可以在之后通过使用带有回调（比如一个 completion 的 block）来请求网络了。这样的好处是，缓存和错误控制也可以在这个类里面完成。

使用Child View Controller

- (void)addPhotoDetailsTableView
{
	DetailsViewController *details = [[DetailsViewController alloc] init];
	details.photo = self.photo;
	details.delegate = self;
	[self addChildViewController:details];
	CGRect frame = self.view.bounds;
	frame.origin.y = 110;
	details.view.frame = frame;
	[self.view addSubview:details.view];
	[details didMoveToParentViewController:self];
}

如果你使用这个解决方案，你就必须在 child view controller 和 parent view controller 之间建立消息传递的渠道

@protocol DetailsViewControllerDelegate
- (void)didSelectPhotoAttributeWithKey:(NSString *)key;
@end

@interface PhotoViewController () 
@end

@implementation PhotoViewController
// ...
- (void)didSelectPhotoAttributeWithKey:(NSString *)key
{
	DetailViewController *controller = [[DetailViewController alloc] init];
	controller.key = key;
	[self.navigationController pushViewController:controller animated:YES];
}
@end