block使用场景（保存代码段）

1.模型CellItem.h

#import <Foundation/Foundation.h>

@interface CellItem : NSObject
@property (strong, nonatomic) NSString *title;

/** 保存点击cell时要执行的代码*/
@property (strong, nonatomic) void(^block)();
+ (instancetype)itemWithTitle:(NSString *)title;
@end

 

2.模型CellItem.m

#import "CellItem.h"

@implementation CellItem

+ (instancetype)itemWithTitle:(NSString *)title
{
    CellItem *item = [[self alloc] init];
    item.title = title;
    return item;
}

@end

3.TableViewController.m

#import "TableViewController.h"
#import "CellItem.h"

@interface TableViewController ()

@property (strong, nonatomic) NSArray *items;

@end

@implementation TableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    CellItem *item1 = [CellItem itemWithTitle:@"撸代码"];
    item1.block = ^{
        NSLog(@"撸代码");
    };
    CellItem *item2 = [CellItem itemWithTitle:@"谈恋爱"];
    item2.block = ^{
        NSLog(@"谈恋爱");
    };
    CellItem *item3 = [CellItem itemWithTitle:@"挣大钱"];
    item3.block = ^{
        NSLog(@"挣大钱");
    };
    self.items = @[item1,item2,item3];
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    static NSString *ID = @"cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell==nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
    }
    
//    if (indexPath.row==0) {
//        cell.textLabel.text = @"撸代码";
//    }else if (indexPath.row==1){
//        cell.textLabel.text = @"谈恋爱";
//    }else if (indexPath.row==1){
//        cell.textLabel.text = @"挣大钱";
//    }

    CellItem *item = self.items[indexPath.row];
    cell.textLabel.text = item.title;
    
    return cell;
}


-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    
    //    if (indexPath.row==0) {
    //        cell.textLabel.text = @"撸代码";
    //    }else if (indexPath.row==1){
    //        cell.textLabel.text = @"谈恋爱";
    //    }else if (indexPath.row==1){
    //        cell.textLabel.text = @"挣大钱";
    //    }
    
    //使用block，免去繁琐的if - esle判断
    CellItem *item = self.items[indexPath.row];
    if (item.block) {
        item.block();
    }
}


@end