UIView的没有显示在UIScrollView中了(UIView is not showing u

我目前动态地添加一个UIImage我的UIScrollView对象，一切都如预期运行。 我现在需要添加额外的功能（图像的中心UIActivityIndi​​cator当它从互联网加载，和下方的标签），所以我想为什么不创建具有所有这些奠定了一个自定义视图，因为我需要他们是，然后只需将其加载到滚动视图。 我虽然已经遇到了一个问题，当我把它添加到滚动视图，什么也不显示。 以下是我有：

NewsViewController.m：

imageScrollView.contentSize = CGSizeMake(320*numberOfPages, 303);
pageControl.numberOfPages = numberOfPages;
dispatch_queue_t imageDownload = dispatch_queue_create("imageDownload", NULL);
__block NSData *temp;
    CustomImageView *customImageView = [[CustomImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 303)];
    [imageScrollView addSubview:customImageView];
    [[customImageView activityIndicator] startAnimating];
    dispatch_async(imageDownload, ^{
        temp = [[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.wlfarm.org/wp-content/uploads/2012/05/farm.jpg"]]retain];
        dispatch_async(dispatch_get_main_queue(), ^{
            customImageView.imageView.image = [[UIImage alloc] initWithData:temp];
            [[customImageView activityIndicator] stopAnimating];
            [customImageView setNeedsDisplay];
            customImageView.caption.text = @"HAHAHAHAHHAHA";
            [imageScrollView setNeedsDisplay];
            [temp release];
        });
    });

    dispatch_release(imageDownload);

CustomImageView.h：

#import <UIKit/UIKit.h>

@interface CustomImageView : UIView
{
    IBOutlet UIImageView *imageView;
    IBOutlet UILabel *caption;
    IBOutlet UIActivityIndicatorView *activityIndicator;
}

@property (nonatomic, retain) IBOutlet UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UILabel *caption;
@property (nonatomic, retain) IBOutlet UIActivityIndicatorView *activityIndicator;
@end

CustomImageView.m

#import "CustomImageView.h"  
@interface CustomImageView ()

@end

@implementation CustomImageView

@synthesize caption, imageView, activityIndicator;

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

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

 - (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:    (UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

我包括我的XIB文件的截图，并在模拟器上运行的程序。 第一个画面显示没有在滚动视图（通过使用我的自定义类所作的尝试），并滚动视图的第二页是通过添加一个UIImageView到的UIScrollView（这工作）作出的尝试。 任何人都可以指出我在做什么错？ 难道我不允许加载自定义视图到一个UIScrollView？ 谢谢你的帮助！

IB截图- http://i.stack.imgur.com/gz9UL.png

iPhone模拟器没有与CustomView截图图片- http://i.stack.imgur.com/zhswq.png

iPhone模拟器图像的UIImageView的截图- http://i.stack.imgur.com/97vmU.png

Answer 1:

看起来好像CustomImageView是一个子类UIViewController ，不是UIImageView或UIView 。 您不能添加UIViewController作为这样的一个子视图。 改变它的子类UIView ，它应该工作。

要加载UIView从笔尖，你需要声明你IBOutlet ，你会为一个属性UIViewController 。 定义正确的自定义类IB和连接一切行动，包括基本视图。 然后覆盖您的自定义视图类中的以下方法。

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
    // Initialization code.
    //
    [[NSBundle mainBundle] loadNibNamed:@"<NIB NAME HERE>" owner:self options:nil];
    [self addSubview:self.view];
    }
  return self;
}

看来你剪切并粘贴了从方法UIViewController子类到你UIView子类。 通过删除所有你之间已经粘贴的方法开始@synthesize和@end 。 甲UIView子类需要不同的方法来从笔尖加载，所以需要覆盖上述代替所示的方法和使用的代码行

[[NSBundle mainBundle] loadNibNamed:@"<NIB NAME HERE>" owner:self options:nil];

加载笔尖。

继你有关连接基视点评论，这里就是我的意思是：

创建自定义类和笔尖文件后，打开笔尖，并强调“文件的所有者”在左边，然后在顶部右侧，然后从左侧的图标3，看起来像一个身份证什么的。 在“类”中，添加自定义类的名称。

在你customClass，添加一个IBOutlet UIView财产称为基本视角，并补充说，涵盖IB的观点在根级别一个UIView，连接这两个。 然后添加其他一切最重要的是

你的代码现在看起来是这样的：

CustomImageView.h

#import <UIKit/UIKit.h>

@interface CustomImageView : UIView
{
    IBOutlet UIView *baseView
    IBOutlet UIImageView *imageView;
    IBOutlet UILabel *caption;
    IBOutlet UIActivityIndicatorView *activityIndicator;
}
@property (nonatomic, retain) IBOutlet UIView *baseView;
@property (nonatomic, retain) IBOutlet UIImageView *imageView;
@property (nonatomic, retain) IBOutlet UILabel *caption;
@property (nonatomic, retain) IBOutlet UIActivityIndicatorView *activityIndicator;
@end

CustomImageView.m

#import "CustomImageView.h"  
@interface CustomImageView ()

@end

@implementation CustomImageView

@synthesize baseView, caption, imageView, activityIndicator;

- (id)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
    // Initialization code.
    //
    [[NSBundle mainBundle] loadNibNamed:@"<NIB NAME HERE>" owner:self options:nil];
    [self addSubview:self.baseView];
    }
  return self;
}

@end

只要你这一切连接在IB应该做工精细，只是记得要加基本视点

Answer 2:

As mentioned earlier initWithNibName belongs to controllers.
As I think, you're going the wrong way.

you have a ViewController and want to add a customView, to load dynamically a image from URLData.

You have 2 Options:
Option 1: Do everything in IB:
In Interfacebuilder edit/(or add a new one) the ViewController's XIB File and add the views that you like. The file's owner is a UIViewController Class/Subclass. Do everything like you did before, except doing it in the view controller. In your App delegate initWithNibName your ViewController like so

    self.viewController = [[testViewController alloc] initWithNibName:@"testViewController" bundle:nil];

If you want to, initialize your own view controller, which you like to push and push it in the stack.

What you're doing wrong: You are initializing a customImageView with a Frame, but the nib doesn't get loaded automatically. The Properties are there, but the nib isn't.

If you really want a stable thing choose
Option 2: Do everything programatically (It is easier, more understanding and lightweight):
From your implementation we do the following:

NewsViewController.m

Do like you did before!!!

CustomImageView.h:

#import <UIKit/UIKit.h>

@interface CustomImageView : UIView
{
    UIImageView *imageView;
    UILabel *caption;
    UIActivityIndicatorView *activityIndicator;
}

@property (nonatomic, retain) UIImageView *imageView;
@property (nonatomic, retain) UILabel *caption;
@property (nonatomic, retain) UIActivityIndicatorView *activityIndicator;
@end

CustomImageView.m:

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        caption = [[UILabel alloc] initWithFrame:CGRectMake(0, 250, 320, 50)];
        [caption setBackgroundColor:[UIColor greenColor]];
        imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 250)];
        [imageView setBackgroundColor:[UIColor blueColor]];
        activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
        self.activityIndicator.frame = CGRectMake(320/2-25, 460/2-25, 50, 50);
        [self.activityIndicator startAnimating];


        [self addSubview:self.caption];
        [self addSubview:self.imageView];
        [self addSubview:self.activityIndicator];
    }
    return self;
}

Then do everything you did before. That would do a better job

文章来源: UIView is not showing up in UIScrollView