iPhone - Class 04

[judaco]

//
//  ViewController.m
//  View Controller
//
//  Created by hackeru on 19/04/2017.
//  Copyright © 2017 juda. All rights reserved.
//

#import "ViewController.h"
#import "ViewController2.h"

@interface ViewController ()

@end

@implementation ViewController
{
    UILabel * label;
    UIButton * button;
    ViewController2 * controller2;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 30)];
    label.center = CGPointMake(self.view.center.x, 100);
    [label setText:@"View Controller 1"];
    label.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:label];

    button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(0, 0, 100, 30);
    button.center = self.view.center;
    [button setTitle:@"click me" forState:UIControlStateNormal];
    [button addTarget:self action:NSSelectorFromString(@"buttonClick:") forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
    controller2 = [[ViewController2 alloc] init];

}

-(void)buttonClick:(UIButton *) sender{
    [self presentViewController:controller2 animated:YES completion:nil];
}

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

@end

[judaco]

//
//  ViewController2.m
//  View Controller
//
//  Created by hackeru on 19/04/2017.
//  Copyright © 2017 juda. All rights reserved.
//

#import <Foundation/Foundation.h>

#import "ViewController2.h"

@implementation ViewController2
{
    UILabel * label;
    UIButton * button;
}

-(void)viewDidLoad{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor blueColor];
    label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 30)];
    label.center = CGPointMake(self.view.center.x, 100);
    [label setText:@"View Controller 1"];
    label.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:label];

    button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(0, 0, 100, 30);
    button.center = self.view.center;
    [button setTitle:@"close" forState:UIControlStateNormal];
    [button addTarget:self action:NSSelectorFromString(@"buttonClick:") forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

-(void)buttonClick:(UIButton *) sender{
    [self dismissViewControllerAnimated:YES completion:nil];
}

@end

[judaco]

//
//  ViewController.m
//  Inner View Controllers
//
//  Created by hackeru on 19/04/2017.
//  Copyright © 2017 juda. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ViewController.h"
#import "ViewController2.h"

@interface ViewController ()

@end

@implementation ViewController
{
    UILabel * label;
    UIButton * btnGoTo2;
    UIButton * btnGoTo3;
    ViewController2 * controller2;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,200,30)];
    label.center = CGPointMake(self.view.center.x, 100);
    label.text = @"First Screen";
    label.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:label];

    btnGoTo2 = [UIButton buttonWithType:UIButtonTypeSystem];
    btnGoTo2.frame = CGRectMake((self.view.frame.size.width-150*2-10)/2, label.frame.origin.y + 200, 150, 30);
    [btnGoTo2 setTitle:@"Second Screen" forState:UIControlStateNormal];
    [btnGoTo2 addTarget:self action:NSSelectorFromString(@"btnGoTo2:") forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btnGoTo2];

    btnGoTo3 = [UIButton buttonWithType:UIButtonTypeSystem];
    btnGoTo3.frame = CGRectMake(btnGoTo2.frame.origin.x + btnGoTo2.frame.size.width + 10, label.frame.origin.y + 200, 150, 30);
    [btnGoTo3 setTitle:@"Third Screen" forState:UIControlStateNormal];
    [btnGoTo3 addTarget:self action:NSSelectorFromString(@"btnGoTo3:") forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btnGoTo3];
}

-(void) goToViewController:(int)which{
    if (controller2 == nil)
        controller2 = [[ViewController2 alloc] init];
    controller2.shouldGoTo = 2;
    [self presentViewController:controller2 animated:YES completion:nil];
}
-(void)btnGoTo2:(UIButton*) sender{
    [self goToViewController:2];
}

-(void)btnGoTo3:(UIButton*) sender{
    [self goToViewController:3];
}

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

@end

[judaco]

//
//  ViewController2.h
//  Inner View Controllers
//
//  Created by hackeru on 19/04/2017.
//  Copyright © 2017 juda. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController2 : UIViewController

@property int shouldGoTo;

@end

//
//  ViewController2.m
//  Inner View Controllers
//
//  Created by hackeru on 19/04/2017.
//  Copyright © 2017 juda. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ViewController.h"
#import "ViewController2.h"
#import "ViewController3.h"

@implementation ViewController2
{
    UILabel * label;
    UIButton * btnGoTo1;
    UIButton * btnGoTo3;
    ViewController3 * controller3;
}
@synthesize shouldGoTo;

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor greenColor]];

    label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,200,30)];
    label.center = CGPointMake(self.view.center.x, 100);
    label.text = @"Second Screen";
    label.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:label];

    btnGoTo1 = [UIButton buttonWithType:UIButtonTypeSystem];
    btnGoTo1.frame = CGRectMake((self.view.frame.size.width-150*2-10)/2, label.frame.origin.y + 200, 150, 30);
    [btnGoTo1 setTitle:@"First Screen" forState:UIControlStateNormal];
    [btnGoTo1 addTarget:self action:NSSelectorFromString(@"btnGoTo1:") forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btnGoTo1];

    btnGoTo3 = [UIButton buttonWithType:UIButtonTypeSystem];
    btnGoTo3.frame = CGRectMake(btnGoTo1.frame.origin.x + btnGoTo1.frame.size.width + 10, label.frame.origin.y + 200, 150, 30);
    [btnGoTo3 setTitle:@"Third Screen" forState:UIControlStateNormal];
    [btnGoTo3 addTarget:self action:NSSelectorFromString(@"btnGoTo3:") forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btnGoTo3];

    NSLog(@"in viewDidLoad of 2 %i", shouldGoTo);
}
-(void) goToViewController:(int)which{
    if (controller3 == nil)
        controller3 = [[ViewController3 alloc] init];
    controller3.shouldGoTo = 3;
    [self presentViewController:controller3 animated:YES completion:nil];
}

-(void)btnGoTo1:(UIButton*) sender{
    [self dismissViewControllerAnimated:YES completion:nil];
}

-(void)btnGoTo3:(UIButton*) sender{
    [self goToViewController:3];
}

-(void)goTo3{
    if (controller3 == nil) {
        controller3 = [[ViewController3 alloc] init];
        [self presentViewController:controller3 animated:YES completion:nil];
    }
}

-(void)viewDidAppear:(BOOL)animated{
    NSLog(@"in viewDidAppear of 2 %i", shouldGoTo);
    if (shouldGoTo == 1) {
        [self dismissViewControllerAnimated:YES completion:nil];
    }else if (shouldGoTo == 3){
            [self goTo3];
    }
}

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

@end

[judaco]

//
//  ViewController3.h
//  Inner View Controllers
//
//  Created by hackeru on 19/04/2017.
//  Copyright © 2017 juda. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController3 : UIViewController

@property int shouldGoTo;

@end

//
//  ViewController3.m
//  Inner View Controllers
//
//  Created by hackeru on 19/04/2017.
//  Copyright © 2017 juda. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "ViewController3.h"

@implementation ViewController3
@synthesize shouldGoTo;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

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

@end