我们在代码编程中，经常用到各种小方法

下面是一些总结：（不定时增加）

16进制设置颜色

- (instancetype)colorFromHexString:(NSString *)hexString Alpha:(CGFloat)alpha
{
    unsigned rgbValue = 0;
    hexString = [hexString stringByReplacingOccurrencesOfString:@"#" withString:@""];
    NSScanner *scanner = [NSScanner scannerWithString:hexString];
    [scanner scanHexInt:&rgbValue];

    return [[self class] colorWithR:((rgbValue & 0xFF0000) >> 16) G:((rgbValue & 0xFF00) >> 8) B:(rgbValue & 0xFF) A:alpha];
}

//根据返回的16进制数据直接加“＃”赋值 （有没有@“＃”不会影响数值）

- (instancetype)colorFromHexString:(NSString *)hexString
{
    return [self colorFromHexString:hexString Alpha:1.0];
}

设置文本显示的长度，多余部分有。。。省略

-(NSString*)stringByTruncateWithLength:(NSInteger)length
{
    if( self.length > length )
    {
        NSMutableString *mstr = [NSMutableString stringWithString:self];
        [mstr deleteCharactersInRange:NSMakeRange(length-3, mstr.length-length+3)];//设置显示文本长度
        [mstr appendString:@"..."];
        return mstr;
    }
    else
        return self;
}

网络状态的监控

-(BOOL)networkAvailable
{
    //创建零地址，0.0.0.0的地址表示查询本机的网络连接状态

    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;

    // Recover reachability flags

    SCNetworkReachabilityRef defaultRouteReachability = SCNetworkReachabilityCreateWithAddress(NULL, (struct sockaddr *)&zeroAddress);

    SCNetworkReachabilityFlags flags;

    //获得连接的标志

    BOOL didRetrieveFlags = SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags);

    CFRelease(defaultRouteReachability);

    if (!didRetrieveFlags)
    {
        return NO;
    }
    //根据获得的连接标志进行判断
    //    SCNetworkReachabilityFlags：保存返回的测试连接状态
    //    其中常用的状态有：
    //    kSCNetworkReachabilityFlagsReachable：能够连接网络
    //    kSCNetworkReachabilityFlagsConnectionRequired：能够连接网络，但是首先得建立连接过程
    //    kSCNetworkReachabilityFlagsIsWWAN：判断是否通过蜂窝网覆盖的连接，比如EDGE，GPRS或者目前的3G.主要是区别通过WiFi的连接

    BOOL isReachable = flags & kSCNetworkFlagsReachable;
    BOOL needsConnection = flags & kSCNetworkFlagsConnectionRequired;
    return (isReachable && !needsConnection) ? YES : NO;
}

＃MD5方法加密

-(NSString*)md5WithString:(NSString *)str
{
    const char *cStr = [str UTF8String];
    unsigned char result[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cStr, (CC_LONG)strlen(cStr), result);

    return [[NSString stringWithFormat:@"XXXXXXXXXXXXXXXX",
             result[0], result[1], result[2], result[3],
             result[4], result[5], result[6], result[7],
             result[8], result[9], result[10], result[11],
             result[12], result[13], result[14], result[15]
             ] lowercaseString];
}

获取本机IP地址

-(NSString*)localIP
{
    NSString *address = @"error";

    struct ifaddrs *interfaces = NULL;

    struct ifaddrs *temp_addr = NULL;

    int success = 0;

    // retrieve the current interfaces - returns 0 on success

    success = getifaddrs(&interfaces);

    if (success == 0) {

        // Loop through linked list of interfaces

        temp_addr = interfaces;

        while(temp_addr != NULL) {

            if(temp_addr->ifa_addr->sa_family == AF_INET) {

                // Check if interface is en0 which is the wifi connection on the iPhone

                if([[NSString stringWithUTF8String:temp_addr->ifa_name] isEqualToString:@"en0"]) {
                    // Get NSString from C String

                    address = [NSString stringWithUTF8String:inet_ntoa(((struct sockaddr_in *)temp_addr->ifa_addr)->sin_addr)];
                }
            }
            temp_addr = temp_addr->ifa_next;
        }
    }

    // Free memory
    freeifaddrs(interfaces);

    return address;
}

几种字符串格式的校验

手机号码校验

-(BOOL)validatePhoneNumber:(NSString*)phoneNumber
{
    if ( phoneNumber.length == 0  || phoneNumber.length != 11 ) return NO;

    NSString *regex = @"^((13[0-9])|(147)|(145)|(15[0-9])|(17[0-9])|(18[0-9]))\\d{8}$";

    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];

    BOOL isMatch = [pred evaluateWithObject:phoneNumber];

    if (!isMatch) {

        return NO;
    }
    return YES;
}

英文字符和数字混编校验(常用作密码校验)

-(BOOL)validatePassword:(NSString*)password
{
    if (password.length<8>16)
    {
        return NO ;
    }

    BOOL numberResult = NO;

    BOOL letterResult = NO;

    for (int i = 0; i<password xss=removed>=48 && character <= 57 ) && numberResult == NO)
        {
            numberResult = YES;
        }

        // A~Z   a~z

        if (((character >=65  && character <=90) || (character >=97  && character <=122))  && letterResult == NO)
        {
            letterResult = YES;
        }

        if (numberResult == YES && letterResult ==YES)
        {
            return YES;
        }

    }
    return NO;
}

邮箱校验

+(BOOL)validateEmailAddress:(NSString*)emailAddress
{
    NSString *emailRegex = @"[A-Z0-9a-z._%+-][email protected][A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES%@",emailRegex];

    return [emailTest evaluateWithObject:emailAddress];
}

POST上传多个文件

//post上传数据

-(void)sendPostRequestWithFileToURL:(NSString*)apiName parameters:(NSDictionary*)params filePathName:(NSArray *)filePathName paramterName:(NSArray *)names mimeType:(NSArray *)mimeType
{
    AFHTTPRequestOperationManager * manager = [AFHTTPRequestOperationManager manager];

    manager.requestSerializer.timeoutInterval = 10.f;

    NSString *apiUrl = [self urlStringWithAPI:apiName];

    NSDictionary *finalParams = [self dictionaryByAddingCommonParameters:params];

    AFHTTPRequestOperation *operation = [manager POST:apiUrl parameters:finalParams constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

        for(int i = 0;i&lt;filePathName.count;i++)
        {
            NSData *data = [NSData dataWithContentsOfFile:filePathName[i]];

            [formData appendPartWithFileData:data name:names[i] fileName:[filePathName[i] lastPathComponent] mimeType:mimeType[i]];

        }
    }
        success:^(AFHTTPRequestOperation * operation ,id responseObject) {

        failure:^(AFHTTPRequestOperation * operatioon,NSError * error) {

}

字典转化为JSON二进制数据流

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dicc options:NSJSONWritingPrettyPrinted error:nil];

“未完待续”