xcode中的预期标识符] [英] expected Identifier ] in xcode

问题描述

我决定对一个iPhone应用程序进行编程，以了解它的简易性.除了这部分，我已经完成了大部分编码，请帮忙:

I decided to program an iphone app to see how easy it was. I have finalized most of the coding except this part, please help:

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    //1
    NSString *urlString = @"http://zaphod_beeblebrox.pythonanywhere.com/";
    //2
    NSURL *url = [NSURL URLWithString:urlString];
    //3
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    //4
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    //5
    [NSURLConnection sendAsynchronousRequest:request queue:queue
                           completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
                               if ([data length] > 0 && error == nil) [UIWebView]
                               else if (error != nil) NSLog(@"Error: %@", error);
                           }];
}

@end

推荐答案

错误消息的来源是您当前拥有[UIWebView]，这没有任何意义，因为方括号表示您正在调用方法，但是您有一个类名，但没有任何方法名.目前尚不清楚您要做什么.请参阅对象消息传递"部分，介绍了调用对象方法(即，向对象发送消息).

The source of your error message is that you currently have [UIWebView], which makes no sense because the square brackets designate that you're invoking a method, but you have a class name, but you don't have any method name. It's not clear what you're trying to do. See the Object Messaging section of the Objective-C Programming Language, which talks about invoking object methods (i.e. sending the object a message).

我猜您正在尝试在UIWebView中加载html页面?显然，您的UIWebView需要一个IBOutlet. (如果这没有意义，我建议您从Apple的教程

I'm guessing you're trying to load a html page in a UIWebView? You obviously need an IBOutlet for your UIWebView. (If that doesn't make sense, I'd suggest you start with Apple's tutorial Your First iOS App.)

在下面的示例中，我假设您的IBOutlet被称为webview，因此我可能建议您摆脱NSOperationQueue和NSUrlConnection并让UIWebView加载html为您:

In my example below, I'm going to assume your IBOutlet is called webview, and thus I might advise getting rid of the NSOperationQueue and NSUrlConnection and just have the UIWebView load the html for you:

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSString *urlString = @"http://zaphod_beeblebrox.pythonanywhere.com/";
    NSURL *url = [NSURL URLWithString:urlString];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [self.webview loadRequest:request];
}

也许值得阅读一些iPhone编程教程(只需在Google上搜索它，您将获得大量点击量)，或者看看Apple

It might be worth going through a few iPhone programming tutorials (just google it and you'll get tons of hits), too or look at the Apple App Programming Guide or check out the wonderful resources at http://developer.apple.com.

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