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Question

我正在尝试为 iOS 创建一个视图工厂，但遇到了一些麻烦。视图工厂应该能够创建多个 UIImageViews、MKMapViews 或 UIWebViews 并将它们垂直添加到视图中。我的 Web 视图有问题，因为我必须等待 webViewDidFinishLoad。如果这些方法是在实现 UIWebViewDelegate 的 ViewController 中实现的，并且将 webviews 的委托设置为控制器，则一切正常。问题是我想将所有这些放在一个单独的 class 中，但 webViewDidFinishLoad 从未被调用过。有没有办法做到这一点？如果您需要任何代码，请告诉我

代码：零件已添加

- (void)addPart
{
  if (self.viewPartStrings.count != 0) {
    NSString *viewPartString = [self.viewPartStrings objectAtIndex:0];
    NSString *viewPartIdentifier = [self getViewPartIdentifier:viewPartString];
    NSString *viewPartDefinition = [self getViewPartDefinition:viewPartString];
    if ([viewPartIdentifier isEqualToString:kWeb]) {
        [self createTextWebViewPart:viewPartIdentifier];
    } else if ([viewPartIdentifier isEqualToString:kMap]) {
        [self createMapViewPart:viewPartDefinition];
    } else if ([viewPartIdentifier isEqualToString:kImage]) {
        [self createImageViewPart:viewPartDefinition];
    }
  }
}

已创建视图：

- (void)createTextWebViewPart:(NSString *)viewPartText
{
    WebViewPart *webViewPart = [[WebViewPart alloc]initWithFrame:[self getViewPartFrameForHeight:0]];
    [webViewPart createViewForText:viewPartText];
    [webViewPart setDelegate:self];
}

- (void)createImageViewPart:(NSString *)viewPartDefinition
{
    //create image
}

- (void)createMapViewPart:(NSString *)viewPartDefinition
{
    //create map
}

但这就是重点。永远不会调用此方法。如果 class 扩展了 NSObject 而不是如果 class 扩展了 UIView:

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    CGRect frame = webView.frame;
    frame.size.height = 1;
    webView.frame = frame;
    CGSize fittingSize = [webView sizeThatFits:CGSizeZero];
    frame.size = fittingSize;
    [webView stringByEvaluatingJavaScriptFromString:@"document.body.style.webkitTouchCallout='none';"];
    int height = frame.size.height + 70;
    [self addToView:webView forHeight:height];

}

编辑： 我也尝试在控制器中这样做：

@interface DetailController ()
@property (nonatomic, strong) ViewPartsFactory *viewPartsFactory;
@end

然后：

- (void)setViewForModel:(DealModel *)model
{
    //...
    self.viewPartsFactory = [[ViewPartsFactory alloc]initWithViewParts:                      [descriptionParser getViewParts]];
    UIView *view = [self.viewPartsFactory getView]
    [scrollView addSubview:view];
    //..
}

和

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    [self.viewPartsFactory webViewDidFinishLoad:webView];
}

将 webview 委托给控制器，但仍然没有。

Answer 1

我会用超级伪代码来回答这个问题，希望它能让您了解我的建议。

// ViewPartsFactory.h

-(void)webViewDidFinishLoad; // implement your logic in this method
// Ensure you DO NOT set the delegate anywhere here, otherwise it'll override when you set it in the view controller.

//--------------------------------------------------//

// DetailController.m

@property (nonatomic, weak) id <UIWebViewDelegate> delegate;
DetailController <UIWebViewDelegate>

-(void)viewDidLoad {
    self.delegate = viewPartsFactory;
}

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