iOS -- Segue 傳入

使用 SEGUE 輸出與輸入資料

e.g. RootViewController 是一TableViewController，將Cell的值傳入DetailViewController。然後，在DetailVC 的TextView編輯好的資料，在回傳入RootViewController上頭的Cell，改變Cell 的值.


++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
RootViewContrller.h 裡要設一 NSDictionary *returnSelection; 來接收回傳的值
RootViewController.m:

//傳資料到DetailController 

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    

    UIViewController *destination = segue.destinationViewController;//將segue的目的控制器指定給destination

    

    //第一個if是回傳時用的

    if ([destination respondsToSelector:@selector(setDelegate:)]) { //如果對setDelegate:方法有反應，便將自己存成value,設key為delegate

        [destination setValue:self forKey:@"delegate"];

    }

    

    //第二個if是傳出用的

    if ([destination respondsToSelector:@selector(setMySelection:)]) {//如果對setSelection:方法有反應,請準備處理選擇後的值

        

        //prepare selection info

        

        NSIndexPath *indexPath = [self.table indexPathForCell:sender];//將選擇的行列指定給indexPath

        id object = [self.arr objectAtIndex:indexPath.row];//取出入徑索引的物件，指定予object

        NSDictionary *mySelection = [NSDictionary dictionaryWithObjectsAndKeys:indexPath, @"indexPath", object, @"object", nil]; //將其入徑索引和物件存入到一個dictionary

        [destination setValue:mySelection forKey:@"mySelection"];//設定下一個控制器的KVC

    }

}

//Setter: 取得來自DetailController的回傳delegate

- (void) setReturnSelection:(NSDictionary *)dict {

    

    if (![dict isEqual:returnSelection]) {

        

        returnSelection = dict;

        NSIndexPath *indexPath = [dict objectForKey:@"indexPath"];

        id newValue = [dict objectForKey:@"object"];

        [tasks replaceObjectAtIndex:indexPath.row withObject:newValue];

        [self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

    }

}

+++++++++++++++++++++++++++++++++++++++
DetailViewContoller.h 要設 id delegate;

DetailViewController.m

//接收root傳來的值

- (void)viewDidLoad

{

    [super viewDidLoad];

NSString *voc = [mySelection objectForKey:@"object"];

}

//回傳到root：

- (void) viewWillDisappear:(BOOL)animated {

    

    [super viewWillDisappear:animated];

    

    if ([delegate respondsToSelector:@selector(setReturnSelection:)]) {

        

        //finish editing

        [textView endEditing:YES];

        //prepare selection info

        NSIndexPath *indexPath = [mySelection objectForKey:@"indexPath"];//回傳到正確的Cell Row

        id object = textView.text;

        NSDictionary *returnSelection = [NSDictionary dictionaryWithObjectsAndKeys:indexPath, @"indexPath", object, @"object", nil];

        

        

        [delegate setValue:returnSelection forKey:@"returnSelection"];

        

    }

}

*******************************************************
********************************************************
Xcode 的樣板

這裡的 data 只是單存的 array:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

{

    if ([[segue identifier] isEqualToString:@"showDetail"]) {

        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];

        

       NSDate *object = [_objects objectAtIndex:indexPath.row];

        

        [[segue destinationViewController] setDetailItem:object];

    }

}

iOS - Keyboard resigns

iOS  離開textField，按背景時，鍵盤降下 Keyboard resigns

//Did End On Exit  輸入完畢時鍵盤降下

- (IBAction)textFieldReturn:(id)sender { //這裡的sender應該是keyboard

    

    [sender resignFirstResponder];

}

//Touch Down 按背景時，鍵盤降下

- (IBAction)backgroundTouched:(id)sender { //這裡的sender應該是背景

    

    [_tempTextField resignFirstResponder];

}

iOS6 - Seque btw 2 View Controllers

iOS6 使用 Segue 傳輸兩個View Controller 之間的字串資料

Storyboard的設定：

在Scene1 的 TextField 輸入字串 "I love you." 按下按鈕，資料將傳到 Scene 2 的 TextField. 如下圖：

                                             

 然後在Scene2編輯後再回傳資料到Scene1,如下：

    

  

分別為這兩個ViewControllers建立兩個Classes,如下：

--------------------------------------------------------------

SceneOneViewController.h: 

#import <UIKit/UIKit.h>

@interface SceneOneViewController : UIViewController

@property (strong, nonatomic) IBOutlet UITextField *SceneOneTextField;

@property (strong, nonatomic) NSString *textOne;

@end

___________________________________________
SceneOneViewController.m: 

#import "SceneOneViewController.h"

#import "SceneTwoViewController.h"

@interface SceneOneViewController ()

@end

@implementation SceneOneViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

//Pass data in scene one to text in scene 2

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    

    SceneTwoViewController *destination = [segue destinationViewController];

    destination.text = _SceneOneTextField.text;

    

}

//Receive data from scene 2 and display in scene 1; the value of var "textOne" should be set in scene 2.m

- (IBAction)returned:(UIStoryboardSegue *)segue {

    _SceneOneTextField.text = _textOne;

}

@end

注意：在Storyboard的Scene2 Controller 裡，將按鈕連到下方綠色的小方格(Exit),選擇上述的 IBAction: returned。讓它離開Scene2回到Scene1時，要執行這個動作，如下：

________________________________________________
SceneTwoViewController.h: 

#import <UIKit/UIKit.h>

@interface SceneTwoViewController : UIViewController

@property (strong, nonatomic) IBOutlet UITextField *SceneTwoTextField;

@property (strong, nonatomic) NSString *text;

@end

________________________________________________
SceneTwoViewController.m: 

#import "SceneTwoViewController.h"

#import "SceneOneViewController.h"

@interface SceneTwoViewController ()

@end

@implementation SceneTwoViewController

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

{

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

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

_SceneTwoTextField.text = _text;

}

- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

//Pass the data from scene 2 to textOne

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    

    SceneOneViewController *destinationVC = [segue destinationViewController];

    destinationVC.textOne = _SceneTwoTextField.text;

    

}

@end