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以编程方式添加UIView无效(UIView应该显示UIWebView并打开URL)

[英]Adding an UIView programmatically not working (UIView should show an UIWebView and open URL)

目前正在为我的iPhone应用程序(如Pocket,为用户提供一些动手操作)在两个简介页上(第一个显示图片,第二个应该显示网站)。 遇到了Matthew York的GitHub项目,该项目可以完美地处理imagestext 另外,我希望在介绍中展示一个网站,但无法正常运行。 我以programmatically创建的UIWebView并未显示。

Matthew York的GitHub项目: https : //github.com/MatthewYork/iPhone-IntroductionTutorial

用于显示两个简介页面的完整代码如下所示。 请注意, panelImage可以正常工作,但是panelView不能panelView 我看到第二页显示了,但是没有UIWebView 我想我的添加subviewview中不可见的屏幕上,因此我没有看到它。 我对吗? 您能否看一下: [view addSubview:aWebView]; methodshowWebView

ViewController.m

- (void)showIntro
{
    MYIntroductionPanel *panelImage = [[MYIntroductionPanel alloc] initWithimage:[UIImage imageNamed:@"img.jpg"] description:@"TEST: IMAGE"];

    MYIntroductionPanel *panelView = [[MYIntroductionPanel alloc] initWitView:[self showWebView] description:@"TEST: VIEW"];

    MYIntroductionView *introductionView = [[MYIntroductionView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) headerText:@"TESTING" panels:@[panelImage, panelView] languageDirection:MYLanguageDirectionLeftToRight];

    introductionView.BackgroundImageView.image = [UIImage imageNamed:@"BG_iPad_1024.png"];
    introductionView.delegate = self;
    [introductionView showInView:self.view];
}

- (UIView *)showWebView
{
    UIWebView *aWebView= [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 290)];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com"]];
    [aWebView loadRequest:requestObj];

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 300)];
    [view addSubview:aWebView];

    return view;
}

MYIntroductionPanel.m

-(id)initWitView:(UIView *)view description:(NSString *)description{
    if (self = [super init]) {
        self.view = [[UIView alloc] init];
        self.Description = [[NSString alloc] initWithString:description];
    }
    return self;
}

-(id)initWithimage:(UIImage *)image title:(NSString *)title description:(NSString *)description{
    if (self = [super init]) {
        self.Image = [[UIImage alloc] init];
        self.Image = image;
        self.Title = title;
        self.Description = [[NSString alloc] initWithString:description];
    }
    return self;
}

您要向其添加UIWebView的视图永远不会添加到视图层次结构本身。 您似乎正在将UIWebView的父视图传递给MyIntroductionPanel的initWithView:description:方法,但是该方法只是忽略其输入视图,并使用self.view = [[UIView alloc] init]创建一个新视图。 尝试在initWithView:description:方法中设置self.view = view

我不喜欢作者的所有决定,但遵循他的模式来实现您想要的。

添加了以下内容:

// MyIntroductionPanel.h
@property (nonatomic, retain) NSURL *url;

-(id)initWithURL:(NSURL *)url;

// MyIntroductionPanel.m
-(id)initWithURL:(NSURL *)url {

    if (self = [super init]) {
        _url = url;
    }
    return self;
}

那很简单。 这不太容易-破解布局方法以处理带有URL的面板。 我并没有尽力去理解这种方法,只是添加了我可以使其工作的一切。 我的添加项标记为// DANH

//  MYIntroductionView.m

-(UIView *)PanelViewForPanel:(MYIntroductionPanel *)panel atXIndex:(CGFloat*)xIndex{

    // snipped original code    

    NSInteger descriptionHeight = panelDescriptionTextView.contentSize.height;
    int contentWrappedScrollViewHeight = 0;
    if ((imageHeight + descriptionHeight + panelTitleLabelFrame.size.height) > maxScrollViewHeight) {
        contentWrappedScrollViewHeight = maxScrollViewHeight;
        imageHeight = contentWrappedScrollViewHeight-descriptionHeight - panelTitleLabelFrame.size.height - 10;
    }
    else if ((imageHeight+descriptionHeight + panelTitleLabelFrame.size.height) <= maxScrollViewHeight){
        contentWrappedScrollViewHeight = imageHeight + panelTitleLabelFrame.size.height + descriptionHeight;
    }

    // DANH
    if (panel.url) {
        contentWrappedScrollViewHeight = 300;
        // you can certainly do a better job than I did here, but just to get going
    }

    panelView.frame = CGRectMake(*xIndex, 0, self.ContentScrollView.frame.size.width, contentWrappedScrollViewHeight);

    //Build image container
    UIImageView *panelImageView = [[UIImageView alloc] initWithFrame:CGRectMake(5, 0, self.ContentScrollView.frame.size.width - 10, imageHeight)];
    panelImageView.contentMode = UIViewContentModeScaleAspectFit;
    panelImageView.backgroundColor = [UIColor clearColor];
    panelImageView.image = panel.Image;
    panelImageView.layer.cornerRadius = 3;
    panelImageView.clipsToBounds = YES;
    [panelView addSubview:panelImageView];

    // DANH
    // add webview on top if we have a url
    if (panel.url) {
        UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.ContentScrollView.frame.size.width, 300)];
        [webView loadRequest:[NSURLRequest requestWithURL:panel.url]];
        [panelView addSubview:webView];
    }

    // snipped original code    

}

现在,用示例代码来调用它。

// MYViewController.m

MYIntroductionPanel *panel3 = [[MYIntroductionPanel alloc] initWithURL:[NSURL URLWithString:@"http://www.google.com"]];

// ...
MYIntroductionView *introductionView = [[MYIntroductionView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) headerText:@"MYIntroductionView" panels:@[panel, panel2, panel3] languageDirection:MYLanguageDirectionLeftToRight];

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