盲人摸象——IOS简单应用ToDoList(Objective-c)

学习IOS两个月，看无线互联的视频和一些东拼西凑的博客，基础没有打好，学习的条理不清晰。还是通过东拼西凑的方式做了一个界面很简单的ToDoList应用，用到一些很基础的知识来实现安排计划、标记完成和取消标记、删除这些十分简单的功能（功能简单到还没有中文输入）。

如上图所示，在textfield框中输入你的计划，点击“Go！”，计划就会在下方列表中显示，当点击列表中每行右端的小方格或者选中每一行，就会标记计划，再次点击取消标记，标记标志为方格中的对勾图形。

将已经显示的计划选中向左方滑动，出现删除选项，点击删除。

这么一个简单的东西，而且还缺少了很多必须要完善的功能，我还是折腾了四五天才勉强做出来，让我深刻地体会到“盲人摸象”和“磨刀不误砍柴工”，还是回去把OC基础语法的视频再过一遍。

在这个程序的编写中，我初步（但是还没有完全）形成mvc模式，传输数据在命名为Task的类中定义：

//Task.h#import <Foundation/Foundation.h>@interface Task : NSObject@property (nonatomic, strong) NSString *content;//输入的计划内容@property (nonatomic, assign) BOOL isMark;//标记标志量@property (nonatomic, strong) NSString *date;//计划建立时间@end

//Task.m#import "Task.h"@implementation Task- (id)init{    self = [super init];    if (self) {        NSDate *today = [NSDate date];        NSDateFormatter *formate = [[NSDateFormatter alloc]init];        [formate setDateFormat:@"hh:mm"];//取出当前时间//        [formate setDateFormat:@"yyyy-MM-dd hh:mm:ss"];        _date = [formate stringFromDate:today];    }    return self;}@end

输入需要的控件在inputTask类中定义：

//imputTask.h#import <UIKit/UIKit.h>@interface InputTask : UIView<UITextFieldDelegate>@property (nonatomic, strong) UITextField *inputText;//输入框@property (nonatomic, strong) UIButton    *button;//按钮“Go!”@end

#import "RootViewController.h"#import "InputTask.h"@implementation InputTask- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:(CGRect)frame];    if (self) {        _inputText = [[UITextField alloc] initWithFrame:CGRectMake(60, 30, 200, 35)];        _inputText.delegate = self; // 设置代理        _inputText.textColor = [UIColor greenColor];        _inputText.placeholder = @"input";        _inputText.adjustsFontSizeToFitWidth = YES;        _inputText.clearsOnBeginEditing = YES;        _inputText.clearButtonMode = UITextFieldViewModeWhileEditing;        _inputText.borderStyle = UITextBorderStyleRoundedRect;        self.userInteractionEnabled = YES;//        [_inputText.window makeKeyAndVisible];        _button = [UIButton buttonWithType:UIButtonTypeCustom];        _button.frame = CGRectMake(265, 30, 50, 35);//        [_button addTarget:self action:@selector() forControlEvents:UIControlEventTouchUpInside];        [_button setTitle:@"Go!" forState:UIControlStateNormal];        [_button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];        [_button setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];        [_button sizeToFit];        [self addSubview:_inputText];        [self addSubview:_button];    }    return self;}#pragma mark - textField Delegate- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{    NSLog(@"textFieldShouldBeginEditing");    [textField.window makeKeyAndVisible];    return YES; // [textField becomeFirstResponder];}- (void)textFieldDidBeginEditing:(UITextField *)textField{    if (!textField.window.isKeyWindow)    {        [textField.window makeKeyAndVisible];    }    NSLog(@"textFieldDidBeginEditing");}- (BOOL)textFieldShouldEndEditing:(UITextField *)textField{    NSLog(@"textFieldShouldEndEditing");    return YES; // [tf resignFirstResponder];}- (void)textFieldDidEndEditing:(UITextField *)textField{    NSLog(@"textFieldDidEndEditing : %@", textField.text);}- (BOOL)textField:(UITextField *)textFieldshouldChangeCharactersInRange:(NSRange)rangereplacementString:(NSString *)string{    NSLog(@"shouldChangeCharactersInRange : %@", string);    NSLog(@"%@", textField.text);    return YES;}- (BOOL)textFieldShouldClear:(UITextField *)textField{    NSLog(@"textFieldShouldClear");    return YES;}- (BOOL)textFieldShouldReturn:(UITextField *)textField{    [textField resignFirstResponder];    return YES;}@end

列表在RootViewController中实现：

//RootViewController.h#import <UIKit/UIKit.h>@interface RootViewController : UIViewController <UITableViewDataSource,UITableViewDelegate>@end

#import "RootViewController.h"#import "TaskCell.h"#import "Task.h"#import "InputTask.h"@interface RootViewController (){    UITableView *_tableView;    NSMutableArray *_taskList;    InputTask *_inputTask;//    UITextField *_tf;//    UIButton    *_button;}@end@implementation RootViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)loadView{    UIView *view = [[UIView alloc] initWithFrame:[UIScreen mainScreen].applicationFrame];    self.view = view;    _tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 70, 320, kDeviceHeight-70) style:UITableViewStylePlain];    _tableView.dataSource = self;    _tableView.delegate = self;    _tableView.rowHeight = 60;    _inputTask = [[InputTask alloc] initWithFrame:CGRectMake(0, 0, kDeviceWidth, 65)];    [_inputTask.button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:_inputTask];//    [self.view addSubview:_button];    [self.view addSubview:_tableView];}- (void)buttonAction:(id)sender{//    NSLog(@"%@", _tf.text);    Task *task = [[Task alloc] init];//    task.date = @"今天";    task.content = _inputTask.inputText.text;//    task.content = _tf.text;    [_taskList insertObject:task atIndex:0];    [_tableView reloadData];    _inputTask.inputText.text = @"";}- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.    _taskList = [[NSMutableArray alloc] initWithCapacity:20];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - TableView Datasource- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;{    return [_taskList count];}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *cellIdentify = @"cell";    TaskCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentify];    Task *task = _taskList[indexPath.row];    if (cell == nil) {        cell = [[TaskCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentify];    }    cell.markButton.tag = indexPath.row;    cell.buttonClick = ^() {        task.isMark = !task.isMark;        [_tableView reloadData];    };    cell.date.text = task.date;    cell.markButton.selected = task.isMark;    cell.textLabel.text = task.content; /*//    UIButton *btn4 = [UIButton buttonWithType:UIButtonTypeRoundedRect];//    btn4.frame = CGRectMake(270.0f, 0.0f, 50.0f, 40.0f);//    [btn4 setTitle:@"删除" forState:UIControlStateNormal];//    [btn4 addTarget:self action:@selector(test) forControlEvents:UIControlEventTouchUpInside];//    [cell addSubview:btn4];   */    return cell;}- (void)test{//    UITextField *tf = (UITextField *)[self.window viewWithTag:101];    // 将键盘移除//    [tf resignFirstResponder];    NSLog(@"hha");}//返回YES，表示支持单元格的移动-(BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath{    return YES;}//单元格返回的编辑风格，包括删除 添加 和 默认  和不可编辑三种风格-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{    return UITableViewCellEditingStyleDelete;}-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{    if (editingStyle==UITableViewCellEditingStyleDelete) {        //        获取选中删除行索引值        NSInteger row = [indexPath row];        //        通过获取的索引值删除数组中的值        [_taskList removeObjectAtIndex:row];        //        删除单元格的某一行时，在用动画效果实现删除过程        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];    }}-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{    UITableViewCell *cellView = [tableView cellForRowAtIndexPath:indexPath];    if (cellView.accessoryType == UITableViewCellAccessoryNone) {//        cellView.accessoryType=UITableViewCellAccessoryCheckmark;//       markButton.selected = !markButton.selected;        Task *task = _taskList[indexPath.row];        task.isMark = !task.isMark;        [tableView reloadData];    }    else {        cellView.accessoryType = UITableViewCellAccessoryNone;        [tableView deselectRowAtIndexPath:indexPath animated:YES];    }}/*#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

UITableView 的单元格cell 中包含了标记按钮和显示时间的UILable，在 TaskCell类中实现：

#import <UIKit/UIKit.h>@interface TaskCell : UITableViewCell@property (nonatomic, strong) UIButton *markButton;@property (nonatomic, strong) UILabel *date;@property (nonatomic, copy) void (^buttonClick)();@end

#import "TaskCell.h"@implementation TaskCell- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];    if (self) {        _markButton = [UIButton buttonWithType:                       UIButtonTypeCustom];        _markButton.frame = CGRectMake(270, 0, 50, 50);        [_markButton setImage:[UIImage imageNamed:@"checkbox_priority"] forState:UIControlStateNormal];        [_markButton setImage:[UIImage imageNamed:@"checkbox_checked"] forState:UIControlStateSelected];        [_markButton addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];        [self addSubview:_markButton];        _date = [[UILabel alloc] initWithFrame:CGRectMake(270, 40, 50, 20)];        [self addSubview:_date];    }    return self;}- (void)click:(id)sender {    if (_buttonClick) {        _buttonClick();    }}- (void)awakeFromNib {    // Initialization code}- (void)setSelected:(BOOL)selected animated:(BOOL)animated {    [super setSelected:selected animated:animated];    // Configure the view for the selected state}@end

这个版本还有很多地方没完善，比如中文输入、响应键盘上的return、我没掌握的block语法（响应标记按钮事件）、没掌握http通信与后台传输数据、单元格动画、丑的不堪的界面等等。盲人摸象做事的效率低下，质量还很差，如果没有导师指导，恐怕要更长的时间才能完成。然而，这并没有完成，我会重新做一个新的版本，加上登陆界面，下一次题目就不能叫盲人摸象了，要做到柳暗花明。