《iOS總結》UITableViewCell的增加與刪除-MickyChiang

UITableViewCell的增加與刪除

我把代碼都貼進來 看不懂的可以聯繫我= = 

// MyCell.h

#import <UIKit/UIKit.h>

@interface MyCell : UITableViewCell 

@property (strong, nonatomic) IBOutlet UITextField *titleTextField;
@property (strong, nonatomic) IBOutlet UITextView *contentTextView;
@property (strong, nonatomic) IBOutlet UIButton *removeButton;

@end

// MyList.h

#import <Foundation/Foundation.h>

@interface MyList : NSObject

@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *content;

@end

// ViewController.h

#import "ViewController.h"
#import "MyCell.h"
#import "MyList.h"

@interface ViewController () <UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate, UITextViewDelegate>

@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, strong) NSMutableArray *objectArr;
@property (nonatomic, strong) MyCell *myCell;

@end

@implementation ViewController

- (void)dealloc
{
    _tableView.delegate=nil;
    _tableView.dataSource=nil;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    [self change];
}

- (void)change
{
    if( ([[[UIDevice currentDevice] systemVersion] doubleValue]>=7.0)) {
        self.navigationController.navigationBar.translucent = NO;
    }
    self.title=@"tableview的增刪改查";
    self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc] initWithTitle:@"保存" style:(UIBarButtonItemStylePlain) target:self action:@selector(saveCell:)];
    self.navigationItem.rightBarButtonItem=[[UIBarButtonItem alloc] initWithTitle:@"添加" style:(UIBarButtonItemStylePlain) target:self action:@selector(insertCell:)];
    MyList *myList = [[MyList alloc] init];
    myList.title=@"1";
    myList.content=@"1";
    [self.objectArr addObject:myList];
    self.tableView.backgroundColor=[UIColor whiteColor];
}

- (void)removeCell:(UIBarButtonItem *)item
{
    if (self.objectArr.count==1) {
        if( ([[[UIDevice currentDevice] systemVersion] doubleValue]>=8.0)) {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:@"不能全部刪除" preferredStyle:(UIAlertControllerStyleAlert)];
            UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@"知道了" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
            }];
            [alert addAction:otherAction];
            [self presentViewController:alert animated:YES completion:nil];
        } else {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"不能全部刪除" delegate:self cancelButtonTitle:nil otherButtonTitles:@"知道了", nil];
            [alert show];
        }
    } else {
        NSLog(@"刪除一個cell");
        [self.objectArr removeObjectAtIndex:self.objectArr.count-1];
        NSLog(@"self.objectArr.count:%@", self.objectArr);
        NSArray *_tempIndexPathArr = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:0]];
        [self.tableView deleteRowsAtIndexPaths:_tempIndexPathArr withRowAnimation:UITableViewRowAnimationFade];
        [self.tableView reloadData];
    }
}

- (void)saveCell:(UIBarButtonItem *)item
{
    NSLog(@"保存cell中的所有內容");
    for (int i=0; i<self.objectArr.count; i++) {
        if ([[[self.objectArr objectAtIndex:i] title] isEqualToString:@""] && [[[self.objectArr objectAtIndex:i] content] isEqualToString:@""]) {
            [self.objectArr removeObjectAtIndex:i];
        }
    }
    NSLog(@"保存後的self.objectArr:%@", self.objectArr);
}

- (void)insertCell:(UIBarButtonItem *)item
{
    NSLog(@"添加一個cell");
    MyList *myList = [[MyList alloc] init];
    myList.title=[NSString stringWithFormat:@"%ld", self.objectArr.count+1];
    myList.content=[NSString stringWithFormat:@"%ld", self.objectArr.count+1];
    [self.objectArr insertObject:myList atIndex:self.objectArr.count];
    NSLog(@"self.objectArr:%@", self.objectArr);
    NSArray *_tempIndexPathArr = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:0]];
    [self.tableView insertRowsAtIndexPaths:_tempIndexPathArr withRowAnimation:UITableViewRowAnimationTop];
    [self.tableView reloadData];
}

- (NSMutableArray *)objectArr
{
    if (_objectArr==nil) {
        _objectArr=[NSMutableArray array];
    }
    return _objectArr;
}

- (UITableView *)tableView
{
    if (!_tableView) {
        _tableView=[[UITableView alloc] initWithFrame:self.view.bounds style:(UITableViewStylePlain)];
        _tableView.delegate=self;
        _tableView.dataSource=self;
        [self.view addSubview:_tableView];
    }
    return _tableView;
}

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

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
//    return 100;
    MyCell *cell = (MyCell *)[self tableView:tableView cellForRowAtIndexPath:indexPath];
    return cell.frame.size.height;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *CellIdentifier = [NSString stringWithFormat:@"MyCell-%ld-%ld",indexPath.section,indexPath.row];
    [_tableView registerNib:[UINib nibWithNibName:@"MyCell" bundle:nil] forCellReuseIdentifier:CellIdentifier];
    MyCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    MyList *myList=[self.objectArr objectAtIndex:indexPath.row];
    cell.titleTextField.text=myList.title;
    cell.removeButton.tag=(indexPath.section+1)*1000+indexPath.row;
    [cell.removeButton addTarget:self action:@selector(removeClicked:) forControlEvents:(UIControlEventTouchUpInside)];
    cell.titleTextField.delegate=self;
    cell.titleTextField.tag=(indexPath.section+1)*1000+indexPath.row;
    cell.tag=(indexPath.section+1)*1000+indexPath.row;
    cell.contentTextView.delegate=self;
    cell.contentTextView.text=myList.content;
    cell.contentTextView.tag=(indexPath.section+1)*1000+indexPath.row;
    return cell;
}

 - (BOOL)textViewShouldEndEditing:(UITextView *)textView
{
    NSLog(@"textViewShouldEndEditing");
    NSLog(@"cell.contentTextView.tag:%ld", textView.tag);
   [textView resignFirstResponder];
    return YES;
}

 - (void)textViewDidEndEditing:(UITextView *)textView
{
    NSLog(@"textViewDidEndEditing");
    NSLog(@"cell.contentTextView.tag:%ld", textView.tag);
    MyList *myList=[self.objectArr objectAtIndex:textView.tag-1000];
    if (![textView.text isEqualToString:myList.content]) {
        myList.content=textView.text;
    } else {
        NSLog(@"content的取值不變");
    }
}

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    NSLog(@"textFieldDidBeginEditing");
    NSLog(@"cell.titleTextField.tag:%ld", textField.tag);
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    NSLog(@"textFieldShouldEndEditing");
    NSLog(@"cell.titleTextField.tag:%ld", textField.tag);
    return YES;
}
 - (void)textFieldDidEndEditing:(UITextField *)textField
{
    NSLog(@"textFieldDidEndEditing");
    NSLog(@"cell.titleTextField.tag:%ld", textField.tag);
    MyList *myList=[self.objectArr objectAtIndex:textField.tag-1000];
    if (![textField.text isEqualToString:myList.title]) {
        myList.title=textField.text;
    } else {
        NSLog(@"title的取值不變");
    }
}
 - (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}

#pragma mark - 刪除cell
- (void)removeClicked:(UIButton *)button
{
    NSLog(@"buttonTag:%ld", button.tag);
    if (self.objectArr.count==1) {
        if( ([[[UIDevice currentDevice] systemVersion] doubleValue]>=8.0)) {
            UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:@"不能全部刪除" preferredStyle:(UIAlertControllerStyleAlert)];
            UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@"知道了" style:(UIAlertActionStyleDefault) handler:^(UIAlertAction * _Nonnull action) {
            }];
            [alert addAction:otherAction];
            [self presentViewController:alert animated:YES completion:nil];
        } else {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"不能全部刪除" delegate:self cancelButtonTitle:nil otherButtonTitles:@"知道了", nil];
            [alert show];
        }
    } else {
        NSLog(@"刪除一個cell");
        [self.objectArr removeObjectAtIndex:button.tag-1000];
        NSLog(@"self.objectArr.count:%@", self.objectArr);
        NSArray *_tempIndexPathArr = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:0]];
        [self.tableView deleteRowsAtIndexPaths:_tempIndexPathArr withRowAnimation:UITableViewRowAnimationFade];
        [self.tableView reloadData];
    }
}

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

@end

// 運行後的效果

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