Objective-C的精華指數：

Question

如何提取NSUInteger index從

NSRange range = [string rangeOfString: substring] 

，所以我可以在[array objectAtIndex:index]寫這個指標？如果子在該字符串的開頭方式發現

Answer 1

// make sure that the substring was actually found: 
NSRange result = [string rangeOfString:substring]; 

if (result.location != NSNotFound) 
{ 
    // make sure that the index exists in the array 
    if (result.location < [array count]) 
    { 
     id someObj = [array objectAtIndex:result.location]; 
     // do something cool with someObj here 
    } 
} 

Answer 2

NSRange range = [string rangeOfString:substring]; 
NSUInteger index = range.location; 
//...