如何從代碼中調用另一個ViewController？

Question

我在這裏閱讀了很多主題，但不明白。例如，我有兩個ViewController。 VC1和VC2。我怎樣才能以編程方式從VC1到VC2？我用NSURLConnection加載數據，然後解析它，如果在接收到的數據中看到字符串「type = 1」，我必須運行另一個ViewController，並且必須運行它的所有方法（ViewDidLoad等）。我該怎麼做？

在VC1我：

If ([[_typeArr objectAtIndex:0]] intValue] == 1) 
    //Here I must to run VC2 

Answer 1

首先，你需要添加您#import VC2.h文件VC1.m文件和 寫下面的代碼時

if ([[_typeArr objectAtIndex:0]] intValue] == 1) 
{ 
    VC2 *vc2 = [[VC2 alloc] init]; // create object of VC2 
    [self presentViewController:vc2 animated:YES completion:nil]; 
      OR // if you have to use navigation controller then 
    [self.navigationController pushViewController:vc2 animated:YES]; 
} 

Answer 2

以下爲推一個新視圖 - 控制到導航控制器堆棧的代碼。希望這是你正在尋找的。

UIViewController *viewController = [[[UIViewController alloc] init] autorelease]; 
[self.navigationController pushViewController:viewController animated:YES]; 

Answer 3

只是尋找導航控制器的教程，你需要一個容器控制器，它可以從一個持有導航以外，這裏有一些鏈接去和具體的問題回來，如果你有。

http://www.ralfebert.de/archive/ios/tutorial_iosdev/navigationcontroller/

http://www.techotopia.com/index.php/Creating_a_Navigation_based_iOS_5_iPhone_Application_using_TableViews

http://www.appcoda.com/use-storyboards-to-build-navigation-controller-and-table-view/

Answer 4

這取決於 - 如果你使用故事板來構建你的應用程序，你應該使用方法觸發seque：

performSegueWithIdentifier:。

如果你不使用故事板和你正在使用的UINavigationController你應該火借：

[self.navigationController pushViewController:viewController animated:YES];

你不使用NavigationController也許UIModalViewController是你正確的答案。

這真的取決於..但我強烈建議你使用故事板和segue。這裏非常棒，並且自己創建了與UINavigationController的連接。

Answer 5

1. If your Application is using Navigation controller Without Storyboard try this: 

if ([[_typeArr objectAtIndex:0]] intValue] == 1) 
{ 
    VC2 *vc2 = [[VC2 alloc] initWithNibName:@"VC2"]; // create object of VC2 
    [self.navigationController pushViewController:vc2 animated:YES]; 
} 

2.If your Project is not using neither Navigation controller nor Storyboard try this: 
if ([[_typeArr objectAtIndex:0]] intValue] == 1) 
    { 
    VC2 *vc2 = [[VC2 alloc] initWithNibName:@"VC2"]; // create object of VC2 
    [self presentViewController:vc2 animated:YES completion:nil]; 
} 

3.If your Project is using Navigation controller and Storyboard Follow This Step: 

     1.In Storyboard File > Go to Your First View Controller on left Side >> Right Click >> Give Connection From Manual to Second View Controller (Under Trigger Segue) 

As Result Connection is created With Arrow In Circle 

Click On Arrow Button (If you can not see that arrow Zoom out storyboard file) 

On Right Side Click on Attribute Inspector 

Give Identifier Name "VC2" 


Now in Code Part: 

if ([[_typeArr objectAtIndex:0]] intValue] == 1) 
{ 
    [self performSegueWithIdentifier:@"VC2" sender:nil]; // Must Be Same as given In Identifier field in storyboard 
}