Question

我正在xcode 5中开发iOS7的应用程序。我有一个视图控制器ADMSViewController .h文件如下

#import <UIKit/UIKit.h>
#import "IMTWebView.h"
@interface ADMSViewController : UIViewController <UIWebViewDelegate,IMTWebViewProgressDelegate>
{
    NSString *barcode;
    NSString *vinNumber;
    NSTimer *timer;

}
@property (nonatomic,retain) IBOutlet UIWebView *webView;
@property (nonatomic,retain) IBOutlet UIProgressView *progressView;
@end

.m文件如下

#import "ADMSViewController.h"

#import <QuartzCore/QuartzCore.h>


@implementation ADMSViewController

@synthesize webView;
@synthesize progressView;

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.
    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://google.com/"]]];

}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:animated];

}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:animated];

}

- (void)webView:(IMTWebView *)_webView didReceiveResourceNumber:(int)resourceNumber totalResources:(int)totalResources {
    [self.progressView setProgress:((float)resourceNumber) / ((float)totalResources)];
    if (resourceNumber == totalResources) {
        _webView.resourceCount = 0;
        _webView.resourceCompletedCount = 0;
    }
}


- (void)viewDidUnload
{
    [super viewDidUnload];
    self.webView = nil;
    self.progressView = nil;
}

@end

IMTWebview.h文件如下

#import <UIKit/UIKit.h>

@class IMTWebView;

@protocol IMTWebViewProgressDelegate <NSObject>
@required
- (void) webView:(IMTWebView*)webView didReceiveResourceNumber:(int)resourceNumber totalResources:(int)totalResources;
@end

@interface IMTWebView : UIWebView {
}

@property (nonatomic, assign) int resourceCount;
@property (nonatomic, assign) int resourceCompletedCount;

@property (nonatomic, assign) id<IMTWebViewProgressDelegate> progressDelegate;

@end

IMTWebCiew.m文件如下

#import "IMTWebView.h"

@interface UIWebView ()
-(id)webView:(id)view identifierForInitialRequest:(id)initialRequest fromDataSource:(id)dataSource;
-(void)webView:(id)view resource:(id)resource didFinishLoadingFromDataSource:(id)dataSource;
-(void)webView:(id)view resource:(id)resource didFailLoadingWithError:(id)error fromDataSource:(id)dataSource;
@end

@implementation IMTWebView

@synthesize progressDelegate;
@synthesize resourceCount;
@synthesize resourceCompletedCount;

-(id)webView:(id)view identifierForInitialRequest:(id)initialRequest fromDataSource:(id)dataSource
{
    [super webView:view identifierForInitialRequest:initialRequest fromDataSource:dataSource];
    return [NSNumber numberWithInt:resourceCount++];
}

- (void)webView:(id)view resource:(id)resource didFailLoadingWithError:(id)error fromDataSource:(id)dataSource {
    [super webView:view resource:resource didFailLoadingWithError:error fromDataSource:dataSource];
    resourceCompletedCount++;
    if ([self.progressDelegate respondsToSelector:@selector(webView:didReceiveResourceNumber:totalResources:)]) {
        [self.progressDelegate webView:self didReceiveResourceNumber:resourceCompletedCount totalResources:resourceCount];
    }
}

-(void)webView:(id)view resource:(id)resource didFinishLoadingFromDataSource:(id)dataSource
{
    [super webView:view resource:resource didFinishLoadingFromDataSource:dataSource];
    resourceCompletedCount++;
    if ([self.progressDelegate respondsToSelector:@selector(webView:didReceiveResourceNumber:totalResources:)]) {
        [self.progressDelegate webView:self didReceiveResourceNumber:resourceCompletedCount totalResources:resourceCount];
    }
}

@end

我的问题是进度条没有在webview中设置动画。请帮助我，因为我是ios开发的新手。如果有任何其他方法来实现相同的，请通知我。提前感谢您的回答。

Answer 1

对于这种事情，你只能通过使用Content-Length标题来“检测”页面大小，但是否则你仍然可以呈现一个加载控件（就像一个移动的斑马线型条形图，它没有显示离散％进度，但表明活动正在发生..甚至只是一个UIActivityIndicator）。您也可以尝试像http://allseeing-i.com/ASIHTTPRequest/ASIWebPageRequest这样的现成课程，它可以显示进度。作者说：

ASIWebPageRequests目前不支持使用其外部资源对整个请求进行进度跟踪。但是，来自外部资源请求的进度更新会传递给您的代理，因此可以通过一些工作自行实现。

如何在UIWebView上实现进度条？

1 个答案: