来自String的UIWebView URL没有http://

Question

所以我使用下面的代码检查字符串是否以"http://"开头,然后我想添加"http://"以便我可以打开页面UIWebView.

NSString *firstString = [NSString stringWithFormat:@"%@", URL.text];
NSString *check = [NSString stringWithFormat:@"%@", @"http://"];

if (firstString != check) {
    NSString *newString = [NSString stringWithFormat:@"http://%@", URL.text];
    newString = [newString substringWithRange:NSMakeRange(7, newString.length - 7)];
    URL.text = newString;
}

[WebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:URL.text]]];`

由于某种原因,这不起作用.你知道为什么吗？

Answer 1

有人在我写作时发帖,但不管怎样,这是一个答案:

你这太难了.您只需使用hasPrefix来检查"http".作为一个例子,我将它用于我的统一搜索/ url栏.

- (IBAction)go:(id)sender {
    NSString *inputString = [searchField stringValue];
    NSString *outputString = [inputString stringByReplacingOccurrencesOfString:@" " withString:@"+"];

    if ([inputString hasPrefix:@"http://"]) {
        //Has Prefix
        [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:inputString]]];
    }
    else
    {
        //Does not have prefix. Do what you want here. I google it.
        NSString *googleString = @"http://google.com/search?q=";
        NSString *searchString = [NSString stringWithFormat:@"%@%@", googleString, outputString];
        [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:searchString]]];

    }

}

这是谷歌搜索,你可以继续使用 NSString *newString = [NSString stringWithFormat:@"http://%@", URL.text];

如果您愿意,还可以添加一些检查.祝好运!