ObjC：如何将组件插入到从A/B到A/之间/B的url？

Question

我需要通过以下方式操作一些 URL 来添加组件：

/img/david/PlayBasketball.jpg

将变为：

/img/HiRes/david/PlayBasketball.jpg

，我该怎么做？

提前致谢！

Answer 1

使用 NSString 方法 pathComponents 和 pathWithComponents：

NSString *p = @"/img/david/PlayBasketball.jpg";

NSMutableArray *cmps = [NSMutableArray arrayWitharray:[p pathComponents]];
// cmps will be: ["/", "img", "david", "PlayBasketball.jpg"]

[cmps insertObject:@"HIRes" atIndex:2];
// You want index 2 because "/" is at index 0, and "img" is at index 1.

NSString *newPath = [NSString pathWithComponents:cmps];
// The pathWithComponents method will add the rest of the "/"'s for you

现在，newPath 将是： @“/img/HiRes/david/PlayBasketball.jpg”。