ios - UIWebView 向 iOS 开发初学者显示空白

Question

我是 iOS 开发新手。我试图制作一个非常简单的应用程序，只显示一个显示网页的 UIWebView:

ViewController.m:

#import "ViewController.h"

@implementation ViewController

@synthesize webView = _webView;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSString *urlAddress = @"http://jsfiddle.net/emj365/qaQnF/embedded/result/";
    NSURL *url = [NSURL URLWithString:urlAddress];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
    [self.webView loadRequest:requestObj];
}

...

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
    UIWebView * _webView;
}
@property (nonatomic, retain) IBOutlet UIWebView * webView;
@end

UIWebView 显示空白。怎么了？

Answer 1

有一些不同的事情可能会出错。您应该检查的几个选项:

• 您是否检查过 socket 是否实际连接到 xib 中的 webview？
• 实现 <a href="http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/UIWebViewDelegate_Protocol/Reference/Reference.html" rel="noreferrer noopener nofollow">UIWebView</a>委托(delegate)并检查(网络)错误