NSString

SString *tempA = @"123";NSString *tempB = @"456";  //1，字符串拼接NSString *newString = [NSString stringWithFormat:@"%@%@",tempA,tempB]; //2，字符转intint intString = [newString intValue]; //3，int转字符NSString *stringInt = [NSString stringWithFormat:@"%d",intString];//4，字符转floatfloat floatString = [newString floatValue]; //5，float转字符NSString *stringFloat = [NSString stringWithFormat:@"%f",intString];