How to make a table view common for multiple view controllers - ios

Question

I am trying to make multiple view controllers with a common table view but i am not able to this i have made a view file and added table view in and importing that file to all view controllers but not able to get the same table view every
here is code :
//
// LeftTableViewClass.h
//
//
// Created by on 30/07/14.
// Copyright (c) 2014 All rights reserved.
//
#import <UIKit/UIKit.h>
#interface LeftTableViewClass : UITableView <UITableViewDataSource,UITableViewDelegate>
#end
//
// LeftTableViewClass.m
//
//
// Created by on 30/07/14.
// Copyright (c) 2014 All rights reserved.
//
#import "LeftTableViewClass.h"
#implementation LeftTableViewClass
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 4;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
//cell.contentView.layer.borderWidth = 1.0f;
//cell.contentView.layer.cornerRadius = 4.0f;
cell.textLabel.text = #"test";
return cell;
}
- (void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"%d",indexPath.row);
}
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
}
*/
#end
LeftTableViewClass *leftTableViewClass = [[LeftTableViewClass alloc] init];
[self.view addSubview:leftTableViewClass];

Answer 1

You can a make a table view class and initialise(alloc) it once and keep the reference for all the controllers.

Answer 2

I think the mistake you are making here is you think you need to subclass UITableView to define it's behavior. But instead Apple uses a delegate design pattern here. Any UITableView has two properties we should worry about here. delegate and dataSource.
The delegate pattern is when the object delegates certain actions to other objects. In this case you set the UITableView's delegate and datasource properties to the object that will define it's behaviors. delegate tells the table view what to do when an action is taken (like selecting a cell). dataSource is used when to tell how many cells and what kind there are.
In your case, you can subclass (although this isn't strictly necessary) but you never set your dataSource and delegate for your table view. You can do this in your init method if you like.
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
self.dataSource = self;
self.delegate = self;
}
return self;
}
This now tells the table view to use itself as the delegate and dataSource. See this article for more information on UITableView here.

Answer 3

Create an UIView subclass with a costructor method which collects the datasource data [array] and frame value then inside the class include the code for table with reference to the frame size of view and display it whereever you want it by creating an instance and adding as a subview.
Why your current option doesn't work
Didn't provide the frame of the LeftTableViewClass instance you created.
The frame is the key to add the subviews.Make the instance allocation using initWithFrame method
Use
LeftTableViewClass *leftTableViewClass = [[LeftTableViewClass alloc] initWithFrame:CGRectMake(0, 0, 150, 200)];