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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？