如何查看NSString是否以某个其他字符串开头？ [英] How to see if an NSString starts with a certain other string?

问题描述

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

I am trying to check to see if a string that I am going to use as URL starts with http. The way I am trying to check right now doesn't seem to be working. Here is my code:

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];

任何想法？

推荐答案

试试这个： if（[myString hasPrefix：@http]）。

顺便说一下，你的测试应该是！= NSNotFound 而不是 == NSNotFound 。但是说你的网址是 ftp://my_http_host.com/thing ，它会匹配，但不应该。

By the way, your test should be != NSNotFound instead of == NSNotFound. But say your URL is ftp://my_http_host.com/thing, it'll match but shouldn't.

这篇关于如何查看NSString是否以某个其他字符串开头？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！