objective-c - x代码 : Passing a Label text into a custom added subview

Question

我重写了这个，希望用更多的代码让它更具描述性:

我已经设置了一个单独的 UIView 类，名为:pageTitleView 代码如下:头文件:

 #import <UIKit/UIKit.h>

 @interface pageTitleView : UIView
    @property (nonatomic, strong) IBOutlet UILabel *pageTitle;
    @property (nonatomic, strong) IBOutlet UILabel *subTitle;
 @end

M 文件:

 @implementation pageTitleView

   @synthesize pageTitle;
   @synthesize subTitle;

  - (id)initWithFrame:(CGRect)frame{

     pageTitle = [[UILabel alloc] initWithFrame:CGRectMake(0,labelPosY,300,20)];
     pageTitle.textColor = txtColour;
     pageTitle.backgroundColor = [UIColor clearColor];
     pageTitle.textAlignment = NSTextAlignmentCenter;
     pageTitle.font = [UIFont systemFontOfSize:14];
     // pageTitle.text to be set by parent view
    [self addSubview:pageTitle];
  }

在我的父 View Controller 中，我有以下内容:

头文件:

  #import <UIKit/UIKit.h>

   @interface UsingThisGuide : UIViewController

     @property (strong, nonatomic) UIView *PageTitleBlock;
     @property (strong, nonatomic) UIWebView *dispalyPageContent;
     @property (strong, nonatomic) UIView *FooterBar;

   @end

在 M 文件中我有以下内容:

  #import <QuartzCore/QuartzCore.h>
  #import "pageTitleView.h"
  #import "MyFirstView.h"

  @interface MyFirstView ()

  @end

  @implementation MyFirstView {
   - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
       self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
         if (self) {
          // Custom initialization
          }
        return self;
     }
   - (void)viewDidLoad {

      _PageTitleBlock = [[pageTitleView alloc] initWithFrame:CGRectMake(0, 0, 300, 50)];
      _PageTitleBlock.layer.cornerRadius = 5;

      _PageTitleBlock.pageTitle.text = @"This should work but not";

      [self.view addSubview:_PageTitleBlock];
      [super viewDidLoad];
    }

 @end

我不想做的是通过其父 Controller MyFirstView 从 pageTitleView 类设置 pageTitle.text 使用类似 _PageTitleBlock.pageTitle.text= 但这是我得到的错误:

  Property 'pageTitle' not found on object of type 'UIView *

Answer 1

是的，您可以轻松做到这一点，例如，使用 properties。

1. 在 @end 之前的 @interface 部分的 TitleBlock(或 pageTitleView)类的头文件中> 你应该定义属性:

   @property (nonatomic, retain) UILabel pageTitle;
   

   或用于 ARC 项目

   @property (nonatomic, strong) UILabel pageTitle;
   

2. 在父 View Controller 中，您应该使用 frame 启动 _PageTitleBlock:

   _PageTitleBlock = [[pageTitleView alloc] initWithFrame:CGRectMake(10, 10, 200, 200)]; // specify needed frame
   // and add it to root view:
   [self.view addSubview:_PageTitleBlock];
   

3. 现在您可以访问 pageTitle 属性:

   _PageTitleBlock.pageTitle.text = @"Text of page title label";
   

希望对你有所帮助。

附言对于类名，最好使用大写名称，即 PageTitleView 而不是 pageTitleView。