20150702_UI之UIViewController的生命周期_viewcontroller = nil 生命周期-优快云博客

//
//  SecondViewController.h
//  IOS150702_UI(03)_UIViewController生命周期
//
//  Created by PengJunlong on 15/7/2.
//  Copyright (c) 2015年 Peng Junlong. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@end

//
//  SecondViewController.m
//  IOS150702_UI(03)_UIViewController生命周期
//
//  Created by PengJunlong on 15/7/2.
//  Copyright (c) 2015年 Peng Junlong. All rights reserved.
//

#import "SecondViewController.h"
#import "ViewController.h"
@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)loadView
{
    [super loadView];   //都要先调用父类的对应方法
    NSLog(@"第二个:开始加载视图");
}

- (void)viewDidLoad {
    [super viewDidLoad];
    NSLog(@"第二个:视图加载完成");
    // Do any additional setup after loading the view, typically from a nib.
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(50, 100, self.view.frame.size.width-100, 50);
    button.backgroundColor = [UIColor redColor];
    [button setTitle:@"视图跳转" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
    
    [self.view addSubview:button];
    self.view.backgroundColor = [UIColor blueColor];
}

- (void)btnClicked
{
    //使消失当前视图控制器视图
    [self dismissViewControllerAnimated:YES completion:nil];
}
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    NSLog(@"第二个:视图将要显示,还没有显示");
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSLog(@"第二个:视图已显示");
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    NSLog(@"第二个:视图将要消失,还没有消失");
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
    NSLog(@"第二个:视图已消失");
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

//
//  ViewController.m
//  IOS150702_UI(03)_UIViewController生命周期
//
//  Created by PengJunlong on 15/7/2.
//  Copyright (c) 2015年 Peng Junlong. All rights reserved.
//

#import "ViewController.h"
#import "SecondViewController.h"
@interface ViewController ()

@end
//视图控制器的生命周期
//当一个视图控制器被创建，并在屏幕上显示的时候。 代码的执行顺序
//1、 alloc                                   创建对象，分配空间
//2、init (initWithNibName) 初始化对象，初始化数据
//3、loadView                          从nib载入视图 ，通常这一步不需要去干涉。除非你没有使用xib文件创建视图
//4、viewDidLoad                   载入完成，可以进行自定义数据以及动态创建其他控件
//5、viewWillAppear              视图将出现在屏幕之前，马上这个视图就会被展现在屏幕上了
//6、viewDidAppear               视图已在屏幕上渲染完成
//当一个视图被移除屏幕并且销毁的时候的执行顺序，这个顺序差不多和上面的相反
//1、viewWillDisappear            视图将被从屏幕上移除之前执行
//2、viewDidDisappear             视图已经被从屏幕上移除，用户看不到这个视图了
//3、dealloc                           视图被销毁，此处需要对你在init和viewDidLoad中创建的对象进行释放
@implementation ViewController

- (void)loadView
{
    [super loadView];   //都要先调用父类的对应方法
    NSLog(@"第一个:开始加载视图");
}

- (void)viewDidLoad {
    [super viewDidLoad];
    NSLog(@"第一个:视图加载完成");
    // Do any additional setup after loading the view, typically from a nib.
    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(50, 100, self.view.frame.size.width-100, 50);
    button.backgroundColor = [UIColor redColor];
    [button setTitle:@"视图跳转" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(btnClicked) forControlEvents:UIControlEventTouchUpInside];
    
    [self.view addSubview:button];
    self.view.backgroundColor = [UIColor yellowColor];
}

- (void)btnClicked
{
    //设置翻页效果
    //typedef NS_ENUM(NSInteger, UIModalTransitionStyle) {
    //    UIModalTransitionStyleCoverVertical = 0,
    //    UIModalTransitionStyleFlipHorizontal,
    //    UIModalTransitionStyleCrossDissolve,
    //    UIModalTransitionStylePartialCurl NS_ENUM_AVAILABLE_IOS(3_2),
    //};
    SecondViewController *svc = [[SecondViewController alloc] init];
    svc.modalTransitionStyle = UIModalTransitionStylePartialCurl;
    [self presentViewController:svc animated:YES completion:^{}];
}
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    NSLog(@"第一个:视图将要显示,还没有显示");
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSLog(@"第一个:视图已显示");
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    NSLog(@"第一个:视图将要消失,还没有消失");
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
    NSLog(@"第一个:视图已消失");
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

运行后的结果:

2015-07-02 18:44:34.219 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:开始加载视图

2015-07-02 18:44:34.220 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图加载完成

2015-07-02 18:44:34.220 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图将要显示,还没有显示

2015-07-02 18:44:34.255 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图已显示

点击按钮后的结果:

2015-07-02 18:44:34.219 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:开始加载视图

2015-07-02 18:44:34.220 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图加载完成

2015-07-02 18:44:34.220 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图将要显示,还没有显示

2015-07-02 18:44:34.255 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图已显示

2015-07-02 18:47:45.577 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第二个:开始加载视图

2015-07-02 18:47:45.577 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第二个:视图加载完成

2015-07-02 18:47:45.581 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图将要消失,还没有消失

2015-07-02 18:47:45.581 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第二个:视图将要显示,还没有显示

2015-07-02 18:47:46.185 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第二个:视图已显示

2015-07-02 18:47:46.185 IOS150702_UI(03)_UIViewController生命周期[1389:57933] 第一个:视图已消失

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