ios - 从 Nib 加载的 subview 中的文本字段访问文本

Question

我正在尝试让我的 viewcontroller (PersonalListViewController) 加载一个 UITableView。页面底部有一个 addPersonalItem 按钮。当用户按下按钮时，它会从 Nib 文件加载 UIView (AddItemView)。

在 AddItemView 上有两个 UITextFields。 1) 如何从 PersonalListViewController 访问字段中输入的文本以及 2) PersonalListViewController 如何知道用户何时删除了 AddItemView从屏幕(即在 AddItemView 上输入文本并按下 Done)？

在PersonalListViewController.m

- (IBAction)addPersonalItem:(id)sender {

        NSArray *subviewArray = [[NSBundle mainBundle] loadNibNamed:@"AddItemView" owner:self options:nil];
        UIView *mainView = [subviewArray objectAtIndex:0];
        [self.view addSubview:mainView];
}

在 AddItemView.h 中

#import <UIKit/UIKit.h>

@interface AddItemView : UIView  {
    IBOutlet UITextField *itemNameTextField;
    IBOutlet UITextField *quantityTextField;
}

@property (strong, nonatomic) IBOutlet UITextField *itemNameTextField;
@property (strong, nonatomic) IBOutlet UITextField *quantityTextField;

@end

在AddItemView.m

#import "AddItemView.h"

@implementation AddItemView

@synthesize itemNameTextField;
@synthesize quantityTextField;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}

Answer 1

试试这个，通过

在 AddItemView 中定义一个 block

typedef void (^completionBlock)(NSString *itemName, NSString *quantity);

为这个 block 添加一个属性

@property (nonatomic, strong) completionBlock completionCallback;

所以，在AddItemView.h

#import <UIKit/UIKit.h>

typedef void (^completionBlock)(NSString *itemName, NSString *quantity);

@interface AddItemView : UIView  {
    IBOutlet UITextField *itemNameTextField;
    IBOutlet UITextField *quantityTextField;
}

@property (strong, nonatomic) IBOutlet UITextField *itemNameTextField;
@property (strong, nonatomic) IBOutlet UITextField *quantityTextField;
@property (nonatomic, strong) completionBlock completionCallback;

- (IBAction)completionButtonAction:(id)sender;

@end

在 AddItemView 中添加一个 UIButton 并在它的操作中实现一个像这样的 block

- (IBAction)completionButtonAction:(id)sender {
     if (self.completionCallback != nil) {
         NSString *itemName = self.itemNameTextField.text;
         NSString *quantity = self. quantityTextField.text;
         self.completionCallback (itemName, quantity);
     }
}

在 PersonalListViewController.m 中

- (IBAction)addPersonalItem:(id)sender {

    NSArray *subviewArray = [[NSBundle mainBundle] loadNibNamed:@"AddItemView" owner:self options:nil];
    AddItemView *mainView = (AddItemView *)[subviewArray objectAtIndex:0];
    void (^completionBlock)(NSString *itemName, NSString *quantity) = ^(NSString *itemName, NSString *quantity){
        [self personalItemAddedWithItemName:itemName quantity:quantity];
    };
    mainView.completionCallback = completionBlock
    [self.view addSubview:mainView];
}


- (void)personalItemAddedWithItemName:(NSString *)itemName quantity:(NSString *)quantity {
    //add your code here
}