stringByReplacingOccurrencesOfString

 

NSString *temp = @"4581230915932414=190110110006767";

NSRange range2 = [temp rangeOfString:@"="];

if (range2.length != 0) {

   [temp stringByReplacingOccurrencesOfString:@"=" withString:@"D"];

    self.userhelper.trackData2 = temp;

}

 

 

 

 

 

注意，方法处理后，会返回新的字符串；本身temp不会改变；