在URL字符串檢測特定字符，並用另一個字符

Question

我保存的NSString這個URL字符串替換：

NSString *currentURL = self.webView.request.URL.absoluteString; 

https://www.tripresso.com/cooperation/toyota?utm_source=cooperation&utm_medium=toyota&utm_campaign=toyota_app?dxid=7019b21e-bd3b-4bde-8917-f353149bdda4&appid=com.hotai.toyota.citydriver.official 

正如你可以看到有這個字符串是2 ?。我的問題是我怎樣才能用&替換第二個?？

Answer 1

如果要刪除所有，但第一次出現，那麼這應該工作：

NSString *currentURL = self.webView.request.URL.absoluteString; 
NSMutableArray *components = [[currentURL componentsSeparatedByString:@"?"] mutableCopy]; 
NSString *firstComponent = [components firstObject]; 
[components removeObject:firstComponent]; 
NSString *newString = [NSString stringWithFormat:@"%@?%@", firstComponent, [components componentsJoinedByString:@"&"]];