iphone - 找到第一个逗号时从 NSString 中删除字符

Question

我有一个NSString& 我想从中删除一些字符，当在其中找到第一个逗号时。

ex. str = @"0,1,2,3"; 
output - > str = @"1,2,3";

这该怎么做。谁能帮我解决这个问题。

Answer 1

检查以下代码：

NSMutableArray *tempArray=[[NSMutableArray alloc]initWithArray:[yourString componentsSeparatedByString:@","]];
if([tempArray count] > 0)
{
   [tempArray removeObjectAtIndex:0];
}
NSString *output=[tempArray componentsJoinedByString:@","];

Answer 2

NSMutableArray *arr1 = [[str1 componentsSeparatedByString:@","] mutableCopy];
if ([arr1 count]){
    [arr1 removeObjectAtIndex:0];
}
NSString *finalStr = [arr1 componentsJoinedByString:@","];

Answer 3

一般情况：

NSString* str= @"0,1,2,3";
NSRange range= [str rangeOfString: @","];
if(range.location!=NSNotFound)
{
    str= [str substringWithRange: NSMakeRange(range.location+1, str.length-range.length-1)];
    NSLog(@"%@",str);
}

如果字符串没有逗号，它不会造成崩溃。

Answer 4

试试这个：

NSString *str1=@"0,1,2,3";
NSMutableArray *arr1=[[NSMutableArray alloc]initWithArray:[str1 componentsSeparatedByString:@","]];
if([arr1 count]>1)[arr1 removeObjectAtIndex:0];//as 1st comma is found. means atleast 2 elements must be there.
NSString *finalString=[arr1 componentsJoinedByString:@","];

注意：这个没有编译和检查..我只是在 Windows 中输入记事本。