《iOS总结》UITableViewCell的增加与删除-MickyChiang

UITableViewCell的增加与删除

我把代码都贴进来 看不懂的可以联系我= =

// 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的增删改查";
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:@"不能全部删除" 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:@"不能全部删除" delegate:self cancelButtonTitle:nil otherButtonTitles:@"知道了", nil];
[alert show];
}
} else {
NSLog(@"删除一个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中的所有内容");
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(@"保存后的self.objectArr:%@", self.objectArr);
}

- (void)insertCell:(UIBarButtonItem *)item
{
NSLog(@"添加一个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的取值不变");
}
}

- (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的取值不变");
}
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}

#pragma mark - 删除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:@"不能全部删除" 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:@"不能全部删除" delegate:self cancelButtonTitle:nil otherButtonTitles:@"知道了", nil];
[alert show];
}
} else {
NSLog(@"删除一个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

// 运行后的效果

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