页面跳转（present）

//

//  TWFXSecondViewController.m

//  DemoMultiView

//

//  Created by Lion User on 12-12-24.

//  Copyright (c) 2012年 Lion User. All rights reserved.

//

#import "TWFXSecondViewController.h"

#import "TWFXThirdViewController.h"

@interface TWFXSecondViewController ()

@end

@implementation TWFXSecondViewController

@synthesize thirdViewController;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

if (self) {

// Custom initialization

}

return self;

}

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view from its nib.

}

- (void)didReceiveMemoryWarning

{

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

/*

多视图切换,如果是从A视图跳转到B视图,那么A表示当前视图,B表示将要跳转到视图

多视图跳转可以理解为有两部分:从A跳到B, B 返回 A.注意,是返回,不是重新发起跳转

这里是第二阶段:从B返回A

self.presentingViewController 在跳转发生后有效,表示B试图的上一个视图,在这里为A视图

self.presentedViewController 在跳转发生后有效,表示B视图的下一个视图,在这里为nil,以为并没有发生跳转

self.parentViewController表示B的父试图,也为nil

*/

-(IBAction)btnClicGoBack:(UIButton *)sender{

void(^task)() = ^{

NSLog(@"2self: %@",self);

NSLog(@"2back ed%@",self.presentedViewController);

NSLog(@"2back ing%@",self.presentingViewController);

//  NSLog(@"back par%@",self.parentViewController);

printf("\n\n");

};

// task();

//跳转完成后调用completion,此时,当前视图已被销毁,self.presentedViewController self.presentingViewController都为nil

[self dismissViewControllerAnimated:YES completion:nil];

task();//此时,当前视图还没被销毁,self.presentingViewController 表示上一个视图

}

- (IBAction)btnClickTraToFirst:(UIButton *)sender {

}

/*

这里表示从B视图跳到C视图

*/

- (IBAction)btnClickTra:(UIButton *)sender {

if (self.thirdViewController == nil) {

/*

最常用的初始化方法

nibName 表示xib文件的名字,不包括扩展名

nibBundle 制定在那个文件束中搜索制定的nib文件,如在主目录下,则可以直接用nil

*/

self.thirdViewController = [[[TWFXThirdViewController alloc] initWithNibName:@"TWFXThirdViewController" bundle:nil]autorelease] ;

}

//视图切换的动画效果

self.thirdViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

void(^task)() = ^{

NSLog(@"2self: %@",self);

NSLog(@"2go ed%@",self.presentedViewController);

NSLog(@"2go ing%@",self.presentingViewController);

//  NSLog(@"go par%@",self.parentViewController);

printf("\n\n");

};

// task = ^(){};

// task();//跳转前没意义

/*

completion是一个回调,当 当前视图(这里是TWFXViewController) 的viewDidDisear调用后,该回调被调用

self.presentingViewController(表示上一个视图)为A视图

self.presentedViewController(表示下一个试图)为C视图

*/

[self presentViewController:thirdViewController animated:YES completion:task];

}

@end