UIActivityIndicatorView 无法以编程方式在 mySubView 中的 UIWebView 上工作

发布于 2024-11-09 06:53:58 字数 3093 浏览 0 评论 0原文

我的 myViewController.h 包含：

#import <UIKit/UIKit.h>

@interface myViewController : UIViewController {

    UIScrollView *myScrollView;

    UIView *mySubView;

    UIWebView *myWebView;

    UIActivityIndicatorView *myIndicator;

}

@property (nonatomic, retain) IBOutlet UIScrollView *myScrollView;

@end

我的 myViewController.m 包含：

#import "myViewController.h"

@implementation myViewController

@synthesize myScrollView;

...

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSArray *bgColors = [NSArray arrayWithObjects:[UIColor redColor], [UIColor greenColor], [UIColor blueColor], nil];

    for (int i = 0; i < bgColors.count; i++)
    {
        CGRect frameNew;
        frameNew.origin.x = self.myScrollView.frame.size.width * i;
        frameNew.origin.y = 0;
        frameNew.size = self.myScrollView.frame.size;

        mySubView = [[UIView alloc] initWithFrame:frameNew];
        mySubView.backgroundColor = [bgColors objectAtIndex:i];

        [self.myScrollView addSubview:mySubView];

        myIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
        myIndicator.center = CGPointMake(160, 100);
        myIndicator.hidesWhenStopped = NO;

        CGRect webFrame = CGRectMake(self.myScrollView.frame.size.width * i, 0, 320, 320);
        myWebView = [[UIWebView alloc] initWithFrame:webFrame];
        [myWebView setDelegate:(id)self];
        [myWebView addSubview:myIndicator];

        NSString *urlAddress = @"http://www.google.com/";
        NSURL *url = [NSURL URLWithString:urlAddress];
        NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
        [myWebView loadRequest:requestObj];

        [self.myScrollView addSubview:myWebView];

        [myIndicator release];
        [myWebView release];
        [mySubView release];
    }

    self.myScrollView.contentSize = CGSizeMake(self.myScrollView.frame.size.width * bgColors.count, self.myScrollView.frame.size.height);
}

-(void)webViewDidStartLoad: (UIWebView *)webView
{
    NSLog(@"Web view did start loading");
    [myIndicator startAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

-(void)webViewDidFinishLoad: (UIWebView *)webView
{
    NSLog(@"Web view did finish loading");
    [myIndicator stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    [myIndicator stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    NSString* errorString = [NSString stringWithFormat:@"<html>%@</html>", error.localizedDescription];
    [myWebView loadHTMLString:errorString baseURL:nil];
}

...

加载指示器在 myWebView 中的前两个 mySubView 上不起作用，仅在最后一个 mySubView 上起作用myWebView 中的代码>。

在 myWebView 中的前两个 mySubView 中，myIndicator 显示但未激活。

告诉我做错了什么？

原文

My myViewController.h contains:

#import <UIKit/UIKit.h>

@interface myViewController : UIViewController {

    UIScrollView *myScrollView;

    UIView *mySubView;

    UIWebView *myWebView;

    UIActivityIndicatorView *myIndicator;

}

@property (nonatomic, retain) IBOutlet UIScrollView *myScrollView;

@end

My myViewController.m contains:

#import "myViewController.h"

@implementation myViewController

@synthesize myScrollView;

...

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSArray *bgColors = [NSArray arrayWithObjects:[UIColor redColor], [UIColor greenColor], [UIColor blueColor], nil];

    for (int i = 0; i < bgColors.count; i++)
    {
        CGRect frameNew;
        frameNew.origin.x = self.myScrollView.frame.size.width * i;
        frameNew.origin.y = 0;
        frameNew.size = self.myScrollView.frame.size;

        mySubView = [[UIView alloc] initWithFrame:frameNew];
        mySubView.backgroundColor = [bgColors objectAtIndex:i];

        [self.myScrollView addSubview:mySubView];

        myIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
        myIndicator.center = CGPointMake(160, 100);
        myIndicator.hidesWhenStopped = NO;

        CGRect webFrame = CGRectMake(self.myScrollView.frame.size.width * i, 0, 320, 320);
        myWebView = [[UIWebView alloc] initWithFrame:webFrame];
        [myWebView setDelegate:(id)self];
        [myWebView addSubview:myIndicator];

        NSString *urlAddress = @"http://www.google.com/";
        NSURL *url = [NSURL URLWithString:urlAddress];
        NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
        [myWebView loadRequest:requestObj];

        [self.myScrollView addSubview:myWebView];

        [myIndicator release];
        [myWebView release];
        [mySubView release];
    }

    self.myScrollView.contentSize = CGSizeMake(self.myScrollView.frame.size.width * bgColors.count, self.myScrollView.frame.size.height);
}

-(void)webViewDidStartLoad: (UIWebView *)webView
{
    NSLog(@"Web view did start loading");
    [myIndicator startAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

-(void)webViewDidFinishLoad: (UIWebView *)webView
{
    NSLog(@"Web view did finish loading");
    [myIndicator stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    [myIndicator stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    NSString* errorString = [NSString stringWithFormat:@"<html>%@</html>", error.localizedDescription];
    [myWebView loadHTMLString:errorString baseURL:nil];
}

...

Load indicator does not work on the first two mySubView in myWebView, works only on the last mySubView in myWebView.

In the first two mySubView in myWebView, myIndicator displayed but not active.

Tell me what's wrong doing?

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与酒说心事 2024-11-16 06:53:58

这是因为 myIndicator 指向最后一个活动指示器视图。所有以前的参考文献都丢失了。幸运的是，由于它是 Web 视图的子视图，因此我们可以获得对它的引用。这应该有帮助——

-(void)webViewDidStartLoad: (UIWebView *)webView
{
    UIActivityIndicatorView *actView;
    for ( id object in webView.subviews ) {
        if ([object isMemberOfClass:[UIActivityIndicatorView class]]) {
            actView = (UIActivityIndicatorView*)object;
        }
    }
    NSLog(@"Web view did start loading");
    [actView startAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
}

-(void)webViewDidFinishLoad: (UIWebView *)webView
{
    UIActivityIndicatorView *actView;
    for ( id object in webView.subviews ) {
        if ([object isMemberOfClass:[UIActivityIndicatorView class]]) {
            actView = (UIActivityIndicatorView*)object;
        }
    }
    NSLog(@"Web view did finish loading");
    [actView stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    UIActivityIndicatorView *actView;
    for ( id object in webView.subviews ) {
        if ([object isMemberOfClass:[UIActivityIndicatorView class]]) {
            actView = (UIActivityIndicatorView*)object;
        }
    }
    [actView stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    NSString* errorString = [NSString stringWithFormat:@"<html>%@</html>", error.localizedDescription];
    [myWebView loadHTMLString:errorString baseURL:nil];
}

That is because myIndicator is pointing to the last activity indicator view. All previous references are lost. Luckily, since it is a subview of the web view, we can get a reference to it. This should help –

-(void)webViewDidStartLoad: (UIWebView *)webView
{
    UIActivityIndicatorView *actView;
    for ( id object in webView.subviews ) {
        if ([object isMemberOfClass:[UIActivityIndicatorView class]]) {
            actView = (UIActivityIndicatorView*)object;
        }
    }
    NSLog(@"Web view did start loading");
    [actView startAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES; 
}

-(void)webViewDidFinishLoad: (UIWebView *)webView
{
    UIActivityIndicatorView *actView;
    for ( id object in webView.subviews ) {
        if ([object isMemberOfClass:[UIActivityIndicatorView class]]) {
            actView = (UIActivityIndicatorView*)object;
        }
    }
    NSLog(@"Web view did finish loading");
    [actView stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    UIActivityIndicatorView *actView;
    for ( id object in webView.subviews ) {
        if ([object isMemberOfClass:[UIActivityIndicatorView class]]) {
            actView = (UIActivityIndicatorView*)object;
        }
    }
    [actView stopAnimating];
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    NSString* errorString = [NSString stringWithFormat:@"<html>%@</html>", error.localizedDescription];
    [myWebView loadHTMLString:errorString baseURL:nil];
}

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