UIContainer View呼叫Parent ViewController屬性與傳值

UIContainer VIew 傳值給ParentViewController

主要是選擇使用delegate的方式，

在ParentViewController.h

#import 
#import "ChildViewController.h"

@interface ViewController : UIViewController<ChildViewControllerDelegate>

@property (weak, nonatomic) IBOutlet UITextField *parentTF;

@end

ParentUIViewController .m 　檔

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (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.
}

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([segue.identifier isEqualToString:@"mySegue"])
    {
        ChildViewController *cVC = segue.destinationViewController;
        cVC.delegate = self;
    }
}

-(void) done:(NSString *)someText andChildBtn:(UIButton *)childBtn
{
    self.parentTF.text = someText;
    [childBtn setTitle:@"changed" forState:UIControlStateNormal];
    [self.view setBackgroundColor:[UIColor darkGrayColor]];
}
@end

而在　ChildViewController.h 要宣告定義好protocol讓UIViewController能夠處理你要他做的事情

#import <UIKit/UIKit.h>
// 傳到到另個 ViewController ，所以自己要先定義protocol
@protocol ChildViewControllerDelegate <NSObject>

-(void)done:(NSString*)someText andChildBtn:(UIButton*)childBtn;

@end

@interface ChildViewController : UIViewController

@property(nonatomic,assign) id<ChildViewControllerDelegate> delegate;

@property (weak, nonatomic) IBOutlet UIButton *passValueBtn;
@property (weak, nonatomic) IBOutlet UITextField *childTF;
- (IBAction)passValueAction:(id)sender;
@end

然後.m檔去呼叫delegate方法

#import "ChildViewController.h"

@implementation ChildViewController

- (IBAction)passValueAction:(id)sender {
    
    [self.delegate done:self.childTF.text andChildBtn:self.passValueBtn];
}
@end

這樣就可以透過container view controller去傳值給parentviewcontroller

而還有夠簡易的方式是

直接由container view controller去修改parent view controller的值

例如

 ((ViewController*)self.parentViewController).lb.text =[NSString stringWithFormat:@"%ld",indexPath.row];

以上是由container view 呼叫 parent view的屬性