Question

我尝试在NSURL中插入内容。我从jSon字符串中获取了我的URL：

imageUrl = [NSURL URLWithString:[[jsonPost objectAtIndex:countPage] objectForKey:@"excerpt"]];

imageURL现在包含以下内容：

http://www.site.com/images/uploads/2011/04/2010-12-14-image.gif

我尝试实现的是将URL更改为：

http://www.site.com/images/uploads/2011/04/2010-12-14-image_r.gif

所以在扩展名之前会添加_r。

Answer 1

方法1 :(如果您知道文件扩展名为.gif）

，则无效

NSString *string = [[jsonPost objectAtIndex:countPage] objectForKey:@"excerpt"]];
NSArray *array = [string componentsSeparatedByString:@".gif"]; //separated by dot
NSString *editedString = [NSString stringWithFormat:@"%@_r.gif",[array objectAtIndex:0]];
NSURL *url = [NSURL urlWithString:editedString];

编辑：一个更可靠的解决方案：

NSRange range;
range.location = 0;//starting from the first character
range.length = string.length - 4;//excluding the last 4 characters
//of course you have to make sure the .extension part is 4 characters long(at least fixed length), not like .torrent or .rmvb
NSString *newString = [urlString substringWithRange:range];//this should give you the url part without the file extension

//then append the newString with something and make your url with this string

在NSURL中进行更改

1 个答案: