java - iPhone Java 字符串代码到对象 C

Question

我有 2 个与对象 C 相关的字符串操作

 // Get the newstring from mystring start at counter
Java: newstring = mystring.substring(counter)  

OBJ-C:？

// Get the position from searchstring in mystring
Java: startpos = mystring.indexOf(searchstring)

ObJ-C:？

如果你能帮忙就太好了

谢谢克里斯

编辑:我还有另外两个问题，现在找到了解决方案(这里也适用于其他问题)

  // Get the Position from searchstring in mystring starting at startfrom
  Java:  location = mystring.indexof(searchfor,startfrom)
  OBJ-C: location = [mystring rangeOfString:searchfor options:NSCaseInsensitiveSearch range:NSMakeRange(startfrom, mystring.length-startfrom)].location;


  // Get the newstring from mystring start at x and end at y
  Java: newstring = mystring.substring(x,y)  
 OBJ-C: newstring = [mystring substringWithRange:NSMakeRange(x,y-x)];

Answer 1

NSString 的 substringFromIndex 和 rangeOfString 方法与您提到的 Java 方法等效:

newstring = mystring.substring(counter)

将是:

NSString *newString = [mystring substringFromIndex:counter];

和

startpos = mystring.indexOf(searchstring)

将是:

NSInteger startPos = [mystring rangeOfString:searchstring].location;

和

newstring = mystring.substring(counter,startfrom)

将是

NSString *newstring = [mystring substringWithRange:NSMakeRange(counter,startfrom)];