iOS UI11_BLOCK传值

////  MainViewController.m//  UI11_block练习////  Created by dllo on 15/8/12.//  Copyright (c) 2015年 zhozhicheng. All rights reserved.//#import "MainViewController.h"#import "SecondViewController.h"@interface MainViewController ()<UITableViewDataSource,UITableViewDelegate>@property(nonatomic,retain)NSMutableArray *arr;@property(nonatomic,retain)UITableView *tableView;@end@implementation MainViewController-(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        self.arr = [NSMutableArray arrayWithObjects:@"宋江", @"卢俊义", @"吴用", @"公孙胜", @"关胜", @"林冲", @"秦明" ,@"呼延灼" , @"花容",@"柴进", @"李应", @"朱仝",@"鲁智深",@"武松",nil];    }return self;}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.navigationController.navigationBar.translucent=NO;    self.tableView=[[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.height, self.view.frame.size.height-64) style:UITableViewStylePlain];    [self.view addSubview:self.tableView];    [self.tableView release];    self.tableView.delegate=self;    self.tableView.dataSource=self;}-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 1;}-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return self.arr.count;}-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *reuse=@"reuse";    UITableViewCell *cell =[tableView dequeueReusableCellWithIdentifier:reuse];    if (!cell) {        cell =[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:reuse] autorelease];    }    cell.textLabel.text=self.arr[indexPath.row];    return cell;}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{#pragma mark block作为属性的时候,为了防止block进入到栈区,栈区内存不需要我们进行管理,很可能出现block消失的情况,所以需要拷贝一份到堆区,这样能防止block在用的时候消失    SecondViewController *secVC=[[SecondViewController alloc] init];    [self.navigationController pushViewController:secVC animated:YES];    [secVC release];    ////2.    //写一个参数是nsstring *的block    void(^block)(NSString *)=^(NSString *str){        NSLog(@"%@",str);        //处理数据        [self.arr addObject:str];        [tableView reloadData];    };    secVC.block=block;}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/@end

////  SecondViewController.h//  UI11_block练习////  Created by dllo on 15/8/12.//  Copyright (c) 2015年 zhozhicheng. All rights reserved.//#import <UIKit/UIKit.h>typedef void(^Block)(NSString *);@interface SecondViewController : UIViewController////1.@property(nonatomic,copy)Block block;@end

////  SecondViewController.m//  UI11_block练习////  Created by dllo on 15/8/12.//  Copyright (c) 2015年 zhozhicheng. All rights reserved.//#import "SecondViewController.h"@interface SecondViewController ()@end@implementation SecondViewController-(void)dealloc{    //block自己的release方法    Block_release(_block);}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor=[UIColor cyanColor];    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    button.frame = CGRectMake(100, 100, 150, 40);    button.layer.borderWidth = 1;    button.layer.cornerRadius = 10;    [self.view addSubview:button];    [button setTitle:@"返回" forState:UIControlStateNormal];    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];}-(void)click:(UIButton *)button{    [self.navigationController popToRootViewControllerAnimated:YES];    ////3.    self.block(@"跳洞虎 陈达");}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/*#pragma mark - Navigation// In a storyboard-based application, you will often want to do a little preparation before navigation- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {    // Get the new view controller using [segue destinationViewController].    // Pass the selected object to the new view controller.}*/@end