字符串的包含、与截取某个字符后面的字符串

if ([obj[@"name"] rangeOfString:textField.text].location != NSNotFound) {
            // [obj[@"name"] 包含  textField.text
        }
//截取字符串某个字符后面的字符串
NSRange range = [message rangeOfString:@"code="]; //现获取要截取的字符串位置
NSString * code = [message substringFromIndex:range.location + range.length]; //截取字符串