#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

+(void)initialize{

    [super initialize];

//1

}

- (instancetype)init

{

    self= [superinit];

    if(self) {

    }

    return self;

}

- (void)viewDidLoad {//4

    [super viewDidLoad];

    UIButton*  btn = [[UIButton alloc]initWithFrame:CGRectMake(10, 10,200, 200)];

    btn.backgroundColor = [UIColor redColor];

    [self.view addSubview:btn];

    [btnaddTarget:self action:@selector(didpush) forControlEvents:(UIControlEventTouchUpInside)];

}

-(void)didpush{

    UIViewController * vc = [[UIViewController alloc]init];

    vc.view.backgroundColor = [UIColor grayColor];

    [self presentViewController:vc animated:YES completion:^{

        nil;

    }];

}

- (instancetype)initWithCoder:(NSCoder*)coder//2

{

    self= [superinitWithCoder:coder];

    if(self) {

    }

    return self;

}

//-(void)awakeFromNib{}

- (void)loadView{

    [super loadView];

    // Do any additional setup after loading the view, typically from a nib.

    UIView* views = [[UIViewalloc]initWithFrame:CGRectMake(30,30,100,200)];

    views.backgroundColor = [UIColor redColor];

}//3

-(void)viewWillAppear:(BOOL)animated{}//5

-(void)viewDidAppear:(BOOL)animated{}//8

-(void)viewWillDisappear:(BOOL)animated{}//9

-(void)viewDidDisappear:(BOOL)animated{}//10

- (void)viewDidLayoutSubviews{}//7 jiazaiwan

- (void)viewWillLayoutSubviews{}//6

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (void)dealloc

{

}

@end

```