#import "ViewController.h"
#import "DJOneViewController.h"
#import "DJTwoViewController.h"
#import "DJThreeViewController.h"


@interface ViewController ()

@property (nonatomic,strong) DJOneViewController *vc1;
@property (nonatomic,strong) DJTwoViewController *vc2;
@property (nonatomic,strong) DJThreeViewController *vc3;


- (IBAction)btn1Click;

- (IBAction)btn2Click;

- (IBAction)btn3Click;


@end

@implementation ViewController



- (DJOneViewController *)vc1 {

    if (!_vc1) {
        DJOneViewController *vc = [[DJOneViewController alloc] init];
        vc.view.frame = CGRectMake(60, 0, 600, 300);
        self.vc1 = vc;
    }
    return _vc1;
}


- (DJTwoViewController *)vc2 {

    if (!_vc2) {
        DJTwoViewController *vc = [[DJTwoViewController alloc] init];
        vc.view.frame = CGRectMake(60, 0, 600, 320);
        self.vc2 = vc;
    }
    return _vc2;

}

- (DJThreeViewController *)vc3 {

    if (!_vc3) {
        DJThreeViewController *vc = [[DJThreeViewController alloc] init];
        vc.view.frame = CGRectMake(60, 0, 600, 320);
        self.vc3 = vc;
    }
    return _vc3;
}


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

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

- (IBAction)btn1Click {

    [self.vc2.view removeFromSuperview];
    [self.vc3.view removeFromSuperview];
    
    [self.view addSubview:self.vc1.view];
}

- (IBAction)btn2Click {

    [self.vc1.view removeFromSuperview];
    [self.vc3.view removeFromSuperview];
    [self.view addSubview:self.vc2.view];
    
    
}

- (IBAction)btn3Click {
    [self.vc1.view removeFromSuperview];
    [self.vc2.view removeFromSuperview];
    [self.view addSubview:self.vc3.view];
}
@end