iOS UI-(多)视图控制器的生命周期、加载方法和模态视图方法以及屌丝方法

 #import "ViewController.h"
 #import "SecondViewController.h"

 @interface ViewController ()

 @end

 @implementation ViewController

 // 视图控制器的生命周期
 // 视图控制器的加载方法
 // 模态视图方法

 /*
 // 视图控制器的加载方法
 - (instancetype)init
 {
     self = [super init];
     if (self) {
         // 属性、成员变量
         // 千万不要在这个地方初始化控件
     }
     return self;
 }

 - (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
 {
     // 初始化控件（用nib文件创建的控件）
     // IB （.Xib文件） 没有stroyboard之前用的 这个文件叫nib文件
 }

 - (void)loadView
 {
     //初始化试图用
 }
 */

 // 视图加载完成时调用，视图控制器当中（伪第一）调用的方法
 - (void)viewDidLoad {
     [super viewDidLoad];
     NSLog(@"viewDidLoad");

     self.view.backgroundColor = [UIColor cyanColor];

     UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
     [btn setFrame:CGRectMake(, , , )];
     [btn setTitle:@"next" forState:UIControlStateNormal];
     [btn setBackgroundColor:[UIColor orangeColor]];
     [btn addTarget:self action:@selector(modelMethod) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:btn];

 }
 #pragma mark - life Cycle
 // 视图（每次）将要出现的时候调用
 - (void)viewWillAppear:(BOOL)animated
 {
     [super viewWillAppear:animated];
     NSLog(@"viewWillAppear");

 }
 // 视图（每次？）出现完成的时候调用
 - (void)viewDidAppear:(BOOL)animated
 {
     [super viewDidAppear:animated];
     NSLog(@"veiwDidAppear");

 }
 // 视图（每次）将要消失的时候调用
 - (void)viewWillDisappear:(BOOL)animated
 {
     [super viewWillDisappear:animated];
     NSLog(@"viewWillDisappear");

 }
 // 视图消失完成之后时候调用
 -(void)viewDidDisappear:(BOOL)animated
 {
     [super viewDidDisappear:animated];
     NSLog(@"viewDidDisappear");

 }

 #pragma mark - Model View Method(模态视图方法)
 - (void)modelMethod
 {
     // 视图切换，切换到下一个视图
     SecondViewController *secondVC = [[SecondViewController alloc] init];
 //    // 伪翻页
 //    secondVC.modalTransitionStyle = UIModalTransitionStylePartialCurl;
 //    // 模态方法跳入
 //    [self presentViewController:secondVC animated:YES completion:nil];

     //屌丝方法
     [self.view addSubview:secondVC.view];
     [self addChildViewController:secondVC];
 }

 #pragma mark - other System Method
 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
 }

 @end

 #import "SecondViewController.h"

 @interface SecondViewController ()

 @end

 @implementation SecondViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     NSLog(@"viewDidLoad");

     self.view.backgroundColor = [UIColor darkGrayColor];

     UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
     [btn setFrame:CGRectMake(, , , )];
     [btn setTitle:@"back" forState:UIControlStateNormal];
     [btn setBackgroundColor:[UIColor whiteColor]];
     [btn addTarget:self action:@selector(backMethod) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:btn];

 }
 - (void)backMethod
 {
     // 模态方法跳出
 //    [self dismissViewControllerAnimated:YES completion:nil];

     //屌丝方法跳出
     [self.view removeFromSuperview];
     [self removeFromParentViewController];
 }

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