计算中间的逗号

Question

我感觉不舒服。如何计算逗号?我不知道该怎么做。我希望代码看起来像这样。

标签。文本=发现4个逗号!!

          NSString *str = @"100,000,000,000,000";
           NSRange detecting = [str rangeOfString:@","];
            if (detecting .length > 0 ) {
             // Count how many commas?
             // label.text = ???;
           }  

标签。文本=发现3个逗号!!

          NSString *str = @"100,000,000,000";
           NSRange detecting = [str rangeOfString:@","];
            if (detecting .length > 0 ) {
             // Count how many commas?
             // label.text = ???;
           }  

标签。文本=找到1逗号!!

          NSString *str = @"100,000";
           NSRange detecting = [str rangeOfString:@","];
            if (detecting .length > 0 ) {
             // Count how many commas?
             // label.text = ???;
           }  

输入新文本框["343,433,463"]，我应该有两个逗号。

          NSString *str = noobie.text;
           NSRange detecting = [str rangeOfString:@","];
            if (detecting .length > 0 ) {
             // Count how many commas?
             // label.text = ???;
           }  

我该怎么做?

Answer 1

NSArray * foo = [str componentsSeparatedByString:@","];
label.text = [NSString stringWithFormat:@"Found %d commas", [foo count] -1];

Answer 2

NSString componentsSeparatedByCharactersInSet:或componentsSeparatedByString:，获取返回数组的大小。