ios开发总结之控制器的生命周期

//
//  OneViewController.m
//

#import "OneViewController.h"

@interface OneViewController ()
@property (nonatomic, strong) NSArray *apps;
@property (nonatomic, strong) NSArray *persons;
@end

@implementation OneViewController

/***

*/

/**
*  view加载完毕就会自动调用
*/
- (void)viewDidLoad
{
[super viewDidLoad];

NSLog(@"OneViewController-viewDidLoad");
}

/**
*  view即将显示到window上
*
*/
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

NSLog(@"OneViewController-viewWillAppear");
}

/**
*  view显示完毕(已经显示到窗口)
*/
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];

NSLog(@"OneViewController-viewDidAppear");
}

/**
*  view即将从window上移除(即将看不见)
*
*/
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];

NSLog(@"OneViewController-viewWillDisappear");
}

/**
*  view从window上完全移除(完全看不见)
*
*/
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];

NSLog(@"OneViewController-viewDidDisappear");
}

/**
*  view即将销毁的时候调用
*/
- (void)viewWillUnload
{
[super viewWillUnload];
}

/**
*  view销毁完毕的时候调用
*/
- (void)viewDidUnload
{
[super viewDidUnload];

// 由于控制器的view已经不在了,需要显示在view上面的一些数据也不需要
self.apps = nil;
self.persons = nil;  //这种方法都可以（arc与非arc）
//
//    [self.apps release];    通常不采用这种方法，这方法只是非arc的方法
//    [self.persons release];
}

/**
*  当接收到内存警告的时候（控制器接收到内存警告的时候，他会做什么操作（调用什么方法）也就是super处理的时候会做什么操作（内存警告 ：首先是代理知道（AppDelegate.m）然后通知控制器 ……
*/
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];

}

@end

<pre name="code" class="objc">//
//  TwoViewController.m

#import "TwoViewController.h"

@interface TwoViewController ()

@end

@implementation TwoViewController
/**
*  view加载完毕
*/
- (void)viewDidLoad
{
[super viewDidLoad];

NSLog(@"TwoViewController-viewDidLoad");
}

/**
*  view即将显示到window上
*
*/
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

NSLog(@"TwoViewController-viewWillAppear");
}

/**
*  view显示完毕(已经显示到窗口)
*/
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];

NSLog(@"TwoViewController-viewDidAppear");
}

/**
*  view即将从window上移除(即将看不见)
*
*/
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];

NSLog(@"TwoViewController-viewWillDisappear");
}

/**
*  view从window上完全移除(完全看不见)
*
*/
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];

NSLog(@"TwoViewController-viewDidDisappear");
}
@end

2.运行验证

首先程序运行，就有下面的打印