ios - 如何查看NSString是否以某个其他字符串开头？

我正在尝试检查要用作URL的字符串是否以http开头。我现在尝试检查的方式似乎不起作用。这是我的代码:

NSMutableString *temp = [[NSMutableString alloc] initWithString:@"http://"];
if ([businessWebsite rangeOfString:@"http"].location == NSNotFound){
    NSString *temp2 = [[NSString alloc] init];
    temp2 = businessWebsite;
    [temp appendString:temp2];
    businessWebsite = temp2;
    NSLog(@"Updated BusinessWebsite is: %@", businessWebsite);
}

[web setBusinessWebsiteUrl:businessWebsite];

有任何想法吗？

最佳答案

试试这个:if ([myString hasPrefix:@"http"])。

顺便说一句，您的测试应该是!= NSNotFound而不是== NSNotFound。但是请说您的网址是ftp://my_http_host.com/thing，它将匹配但不应该匹配。