How to call one class delegate methods from another class - ios

Question

In table list using swift here i want to load the one class table-list in another class view controller and this concept is working in objective-c but come down to swift delegate methods are not calling my objective -c#swift codes below please help me some one else
BackGroundView.h:-
#import <UIKit/UIKit.h>
#interface BackGroundView
UIViewController<UITableViewDataSource,UITableViewDelegate>
{
UITableView *tableView;
}
#property(nonatomic, retain) UITableView *tableView;
-(void)tableList:(UIView *) view1;
#end
BackGroundView.m:-
#import "BackGroundView.h"
#interface BackGroundView ()
{
NSArray * Mainarray;
}
#end
#implementation BackGroundView
#synthesize tableView;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
-(void)tableList:(UIView *) view1
{
Mainarray = [[NSArray alloc]initWithObjects:#"india",#"australia",#"usa", nil];
tableView=[[UITableView alloc]init];
tableView.frame = CGRectMake(0,0,320,400);
tableView.dataSource=self;
tableView.delegate=self;
tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
[tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"Cell"];
[tableView reloadData];
tableView.separatorColor = [UIColor blackColor];
self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
[view1 addSubview:tableView];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return Mainarray.count;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath] ;
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text= [Mainarray objectAtIndex:indexPath.row];
return cell;
}
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([cell respondsToSelector:#selector(setSeparatorInset:)]) {
[cell setSeparatorInset:UIEdgeInsetsZero];
}
if ([cell respondsToSelector:#selector(setPreservesSuperviewLayoutMargins:)]) {
[cell setPreservesSuperviewLayoutMargins:NO];
}
if ([cell respondsToSelector:#selector(setLayoutMargins:)]) {
[cell setLayoutMargins:UIEdgeInsetsZero];
}
}
#end
MaindView.h
#import <UIKit/UIKit.h>
#interface ViewController1 : UIViewController
#end
MaindView.m
#import "ViewController1.h"
#import "BackGroundView.h"
#interface MaindView ()
{
BackGroundView * v1;
}
#end
#implementation MaindView
- (void)viewDidLoad {
[super viewDidLoad];
v1 = [[BackGroundView alloc]init];
// Do any additional setup after loading the view.
[v1 tableList:self.view];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Now it's working fine in objective-c and table list is loading fine
come down to swift ios:-
Now i am calling TableViewAdding from Mainview class to BackgroundView it's calling but delegate methods are not calling in background class i.e it is showing empty view controller in swift table list is not loading properly please help me and this is my swift code
BackGroundView.swift
import UIKit
class BackGroundView: UIViewController,UITableViewDelegate, UITableViewDataSource {
var tableView: UITableView = UITableView()
var items = NSArray ()
override func viewDidLoad() {
super.viewDidLoad()
}
func TableViewAdding(myview:UIView)
{
items = ["india","australia","usa"];
println(items)
tableView.frame = CGRectMake(0, 50, 320, 200);
tableView.delegate = self
tableView.dataSource = self
tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
myview.addSubview(tableView)
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
println("numberOfRowsInSection")
return self.items.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
println("cellForRowAtIndexPath")
var cell:UITableViewCell = tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell
cell.textLabel?.text = self.items.objectAtIndex(indexPath.row) as NSString
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
println("in first")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Mainview.swift
import UIKit
class Mainview: UIViewController{
#IBOutlet var myview1: UIView!
override func viewDidLoad() {
super.viewDidLoad()
var total = BackGroundView.alloc()
total.TableViewAdding(self.view)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}

Answer 1

[UPDATED]
You're not initializing the BackGroundView in mainview.swift. You're just allocating the memory for the object. Note that you both alloc and init a class in Objective-C. In Swift, you have to do the same thing with Class.alloc().initialize(). However, swift has replaced that verbose line of code with a simple call: Class()
Objective-C:
Class *myInstance = [[Class alloc] init];
Swift:
var myInstance = Class()
Some other things:
It's always a good idea to call tableView.reloadData() after you
change the information in it (like in your TableViewAdding) method.
It's never a good idea to hard code numbers (like the table view size).
TableViewAdding looks like a class method. tableViewAdding would follow the camelCase convention more accurately
Documentation for why using var myInstance = Class.alloc() is not the same as using var myInstance = Class() can be found in Apple's NSObject documentation under Creating, Copying, and Deallocating Objects
https://developer.apple.com/library/prerelease/ios/documentation/Cocoa/Reference/Foundation/Classes/NSObject_Class/index.html#//apple_ref/occ/clm/NSObject/alloc

Answer 2

Using KVC to get delegate property.
Using NSInvocation to call delegate method

Answer 3

Declare total as Class variable in Mainview.swift. Don't use .alloc()
import UIKit
class Mainview: UIViewController{
var total = BackGroundView()
#IBOutlet var myview1: UIView!
override func viewDidLoad() {
super.viewDidLoad()
total.TableViewAdding(self.view)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}