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