UI_在tableView中利用block传值

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这里写图片描述

RootViewController.m#import "RootViewController.h"#import "SecondViewController.h"@interface RootViewController ()<UITableViewDataSource,UITableViewDelegate>@property(nonatomic, retain)UITableView *tableView;@property(nonatomic, retain)NSMutableArray *array;@end@implementation RootViewController- (void)dealloc{    [_array release];    [_tableView release];    [super dealloc];}- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        [self createData];    }    return self;}- (void)createData {    self.array = [NSMutableArray array];    self.array = [NSMutableArray arrayWithObjects:@"宋江", @"卢俊义", @"吴用", @"公孙胜", @"关胜", @"林冲", @"秦明" ,@"呼延灼" , @"花荣",@"柴进", @"李应", @"朱仝",@"鲁智深",@"武松",nil];}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) style:UITableViewStylePlain];    [self.view addSubview:self.tableView];    [_tableView release];    self.tableView.delegate = self;    self.tableView.dataSource = self;    self.tableView.rowHeight = 100;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    return self.array.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    static NSString *reuse = @"reuse";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:reuse];    if (!cell) {        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuse] autorelease];    }    cell.textLabel.text = self.array[indexPath.row];    return cell;}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {    SecondViewController *second = [[SecondViewController alloc] init];    [self.navigationController pushViewController:second animated:YES];    [second release];    void (^block)(NSString *) = ^(NSString *str){        // 一切传值过程,都要在block中写.        self.array[indexPath.row] = str;        [self.array addObject:str];        [self.tableView reloadData];    };    // 用属性接收此block    second.block = block;}

SecondViewController.h#import <UIKit/UIKit.h>typedef void (^Block)();@interface SecondViewController : UIViewController// 写一个block属性,接受前面的block.@property(nonatomic, copy)Block block;@end

SecondViewController.m#import "SecondViewController.h"@interface SecondViewController ()@end@implementation SecondViewController- (void)dealloc{    Block_release(_block);    [super dealloc];}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    self.view.backgroundColor = [UIColor whiteColor];    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];    button.frame = CGRectMake(100, 100, 150, 50);    [self.view addSubview:button];    button.layer.borderWidth = 1;    [button setTitle:@"返回" forState:UIControlStateNormal];    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];}- (void)click:(UIButton *)button {    [self.navigationController popToRootViewControllerAnimated:YES];    // 从后向前用block传值.    self.block(@"哈哈");}

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