自己整理了一个常用的工具类,欢迎大家吐槽~

↓↓↓↓↓↓

#pragma mark - NSString字符串

// 判断字符串为空
+ (BOOL)isEmptyOrNull:(NSString *)string
{
    if (string == nil)
    {
        return YES;
    }
    if (string == NULL)
    {
        return YES;
    }
    if ([string isKindOfClass:[NSNull class]])
    {
        return YES;
    }
    if ([string isEqualToString:@""])
    {
        return YES;
    }
    if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length] == 0)
    {
        return YES;
    }
    return NO;
}

// 检查字符串是否是纯数字
+ (BOOL)checkStringIsOnlyDigital:(NSString *)str
{
   NSString *string = [str stringByTrimmingCharactersInSet:[NSCharacterSet decimalDigitCharacterSet]];
    if(string.length >0)
    {
        return NO;
    }else return YES;
}

//检查字符串是否为nil 转为@""
+ (NSString *)checkStringValue:(id)str
{
    if ([str isKindOfClass:[NSNull class]]) {
        return @"";
    }
    return str;
}

//判断字符串中包含汉字
+ (BOOL)checkStringIsContainerChineseCharacter:(NSString *)string
{
    for (int i = 0; i < string.length; i++)
    {
        int a = [string characterAtIndex:i];
        if (a >= 0x4e00 && a <= 0x9fff) {
            return YES;
        }
    }
    return NO;
}

//过滤特殊字符串
+ (NSString *)filterSpecialString:(NSString *)string
{
    NSCharacterSet *dontWant = [NSCharacterSet characterSetWithCharactersInString:@"[]{}（#%-*+=_）\\|~(＜＞$%^&*)_+,.;':|/@!? "];
    //stringByTrimmingCharactersInSet只能去掉首尾的特殊字符串
    return [[[string componentsSeparatedByCharactersInSet:dontWant] componentsJoinedByString:@""] stringByReplacingOccurrencesOfString:@"\n" withString:@""];
}


#pragma mark - 字符串size

/**
 *  计算字符串尺寸
 *
 *  @param string
 *  @param font   字体
 *  @param size
 *
 *  @return
 */
+ (CGSize)sizeWithString:(NSString *)string font:(UIFont *)font size:(CGSize)size
{
    NSDictionary *dic = @{NSFontAttributeName:font};
    return [string boundingRectWithSize:size options:(NSStringDrawingUsesLineFragmentOrigin) attributes:dic context:nil].size;
}

#pragma mark - UIColor

+ (UIColor *)colorFromHexCode:(NSString *)hexString
{
    if (!hexString) {
        return [UIColor clearColor];
    }
    NSString *cleanString = [hexString stringByReplacingOccurrencesOfString:@"#" withString:@""];
    if([cleanString length] == 3) {
        cleanString = [NSString stringWithFormat:@"%@%@%@%@%@%@",
                       [cleanString substringWithRange:NSMakeRange(0, 1)],[cleanString substringWithRange:NSMakeRange(0, 1)],
                       [cleanString substringWithRange:NSMakeRange(1, 1)],[cleanString substringWithRange:NSMakeRange(1, 1)],
                       [cleanString substringWithRange:NSMakeRange(2, 1)],[cleanString substringWithRange:NSMakeRange(2, 1)]];
    }
    if([cleanString length] == 6) {
        cleanString = [cleanString stringByAppendingString:@"ff"];
    }
    
    unsigned int baseValue;
    [[NSScanner scannerWithString:cleanString] scanHexInt:&baseValue];
    
    float red = ((baseValue >> 24) & 0xFF)/255.0f;
    float green = ((baseValue >> 16) & 0xFF)/255.0f;
    float blue = ((baseValue >> 8) & 0xFF)/255.0f;
    float alpha = ((baseValue >> 0) & 0xFF)/255.0f;
    
    return [UIColor colorWithRed:red green:green blue:blue alpha:alpha];
}

//从图片转到颜色
+ (UIColor *)colorFromImage:(UIImage *)image
{
    if (image == nil)
    {
        return [UIColor clearColor];
    } else {
        return [UIColor colorWithPatternImage:image];
    }
}


#pragma mark - UIImage
//从颜色生成图片
+ (UIImage *)imageFromUIColor:(UIColor *)color {
    if (!color) {
        color = [UIColor clearColor];
    }
    CGRect rect = CGRectMake(0, 0, 1, 1);
    // create a 1 by 1 pixel context
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
    [color setFill];
    UIRectFill(rect);
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

#pragma mark - 压缩图片
// 压缩图片按照大小
+ (UIImage *)image:(UIImage *)image scaleToSize:(CGSize)size
{
    CGImageRef imgRef = image.CGImage;
    CGSize originSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef)); // 原始大小
    if (CGSizeEqualToSize(originSize, size)) {
        return image;
    }
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);            //[UIScreen mainScreen].scale
    CGContextRef context = UIGraphicsGetCurrentContext();
    /**
     *  设置CGContext集插值质量
     *  kCGInterpolationHigh 插值质量高
     */
    CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
    [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return scaledImage;
}

// 压缩图片按照比例
+ (UIImage *)image:(UIImage *)image scaleWithRatio:(CGFloat)ratio
{
    CGImageRef imgRef = image.CGImage;
    if (ratio > 1 || ratio <= 0) {
        return image;
    }
    CGSize size = CGSizeMake(CGImageGetWidth(imgRef) * ratio, CGImageGetHeight(imgRef) * ratio); // 缩放后大小
    return [self image:image scaleToSize:size];
}

#pragma mark - 添加水印
+ (UIImage *)image:(UIImage *)img addLogo:(UIImage *)logo
{
    if (logo == nil ) {
        return img;
    }
    if (img == nil) {
        return nil;
    }
    //get image width and height
    int w = img.size.width;
    int h = img.size.height;
    int logoWidth = logo.size.width;
    int logoHeight = logo.size.height;
    
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    //create a graphic context with CGBitmapContextCreate
    CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 44 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
    CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
    CGContextDrawImage(context, CGRectMake(w-logoWidth-15, 10, logoWidth, logoHeight), [logo CGImage]);
    CGImageRef imageMasked = CGBitmapContextCreateImage(context);
    UIImage *returnImage = [UIImage imageWithCGImage:imageMasked];
    CGContextRelease(context);
    CGImageRelease(imageMasked);
    CGColorSpaceRelease(colorSpace);
    return returnImage;
}

#pragma mark - NSUserDefault

// 取值
id UserDefaultGetObj(NSString *key)
{
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
    return [ud objectForKey:key];
}

// 存入
void UserDefaultSetObjForKey(id object,NSString *key)
{
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
    [ud setValue:object forKey:key];
    [ud synchronize];
}

// 移除
void UserDefaultRemoveObjForKey(NSString *key)
{
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
    [ud removeObjectForKey:key];
    [ud synchronize];
}

// 清空
void UserDefaultClean()
{
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults];
    [ud removePersistentDomainForName:[[NSBundle mainBundle] bundleIdentifier]];
    [ud synchronize];
}


#pragma mark - SandBox 沙盒相关

NSString *pathDocuments()
{
    return NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
}

NSString *pathCaches()
{
    return NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)[0];
}

/**
 *  Documents/name path
 *
 *  @param name
 *
 *  @return
 */
NSString *pathDocumentsWithFileName(NSString *name)
{
    return [pathDocuments() stringByAppendingString:name];
}

/**
 *  Caches/name path
 *
 *  @param name
 *
 *  @return
 */
NSString *pathCachesWithFileName(NSString *name)
{
    return [pathCaches() stringByAppendingString:name];
}


#pragma mark - 检查手机号码是否规范
/**
 *  检查是否为正确手机号码
 *
 *  @param phoneNumber 手机号
 *
 *  @return
 */
+ (BOOL)checkPhoneNumber:(NSString *)phoneNumber
{
    if (phoneNumber.length != 11)
    {
        return NO;
    }
    /**
     * 手机号码:
     * 13[0-9], 14[5,7], 15[0, 1, 2, 3, 5, 6, 7, 8, 9], 17[0, 1, 6, 7, 8], 18[0-9]
     * 移动号段: 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
     * 联通号段: 130,131,132,145,155,156,170,171,175,176,185,186
     * 电信号段: 133,149,153,170,173,177,180,181,189
     */
    NSString *MOBILE = @"^1(3[0-9]|4[57]|5[0-35-9]|7[0135678]|8[0-9])\\d{8}$";
    /**
     * 中国移动：China Mobile
     * 134,135,136,137,138,139,147,150,151,152,157,158,159,170,178,182,183,184,187,188
     */
    NSString *CM = @"^1(3[4-9]|4[7]|5[0-27-9]|7[08]|8[2-478])\\d{8}$";
    /**
     * 中国联通：China Unicom
     * 130,131,132,145,155,156,170,171,175,176,185,186
     */
    NSString *CU = @"^1(3[0-2]|4[5]|5[56]|7[0156]|8[56])\\d{8}$";
    /**
     * 中国电信：China Telecom
     * 133,149,153,170,173,177,180,181,189
     */
    NSString *CT = @"^1(3[3]|4[9]|53|7[037]|8[019])\\d{8}$";
    
    
    NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    NSPredicate *regextestcm = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CM];
    NSPredicate *regextestcu = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CU];
    NSPredicate *regextestct = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", CT];
    
    if (([regextestmobile evaluateWithObject:phoneNumber] == YES)
        || ([regextestcm evaluateWithObject:phoneNumber] == YES)
        || ([regextestct evaluateWithObject:phoneNumber] == YES)
        || ([regextestcu evaluateWithObject:phoneNumber] == YES))
    {
        return YES;
    }
    else
    {
        return NO;
    }
}
#pragma mark - 检查邮箱地址格式
/**
 *  检查邮箱地址格式
 *
 *  @param EmailAddress 邮箱地址
 *
 *  @return
 */
+ (BOOL)checkEmailAddress:(NSString *)EmailAddress
{
    NSString *emailRegEx =
    @"(?:[a-z0-9!#$%\\&'*+/=?\\^_`{|}~-]+(?:\\.[a-z0-9!#$%\\&'*+/=?\\^_`{|}"
    @"~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\"
    @"x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@(?:(?:[a-z0-9](?:[a-"
    @"z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5"
    @"]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-"
    @"9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21"
    @"-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])";
    
    NSPredicate *regExPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
    
    //先把NSString转换为小写
    NSString *lowerString       = EmailAddress.lowercaseString;
    
    return [regExPredicate evaluateWithObject:lowerString] ;
}
#pragma mark - 身份证相关
/**
 *  判断身份证是否合法
 *
 *  @param number 身份证号码
 *
 *  @return
 */
+ (BOOL)checkIdentityNumber:(NSString *)number
{
    {
        //必须满足以下规则
        //1. 长度必须是18位或者15位，前17位必须是数字，第十八位可以是数字或X
        //2. 前两位必须是以下情形中的一种：11,12,13,14,15,21,22,23,31,32,33,34,35,36,37,41,42,43,44,45,46,50,51,52,53,54,61,62,63,64,65,71,81,82,91
        //3. 第7到第14位出生年月日。第7到第10位为出生年份；11到12位表示月份，范围为01-12；13到14位为合法的日期
        //4. 第17位表示性别，双数表示女，单数表示男
        //5. 第18位为前17位的校验位
        //算法如下：
        //（1）校验和 = (n1 + n11) * 7 + (n2 + n12) * 9 + (n3 + n13) * 10 + (n4 + n14) * 5 + (n5 + n15) * 8 + (n6 + n16) * 4 + (n7 + n17) * 2 + n8 + n9 * 6 + n10 * 3，其中n数值，表示第几位的数字
        //（2）余数 ＝ 校验和 % 11
        //（3）如果余数为0，校验位应为1，余数为1到10校验位应为字符串“0X98765432”(不包括分号)的第余数位的值（比如余数等于3，校验位应为9）
        //6. 出生年份的前两位必须是19或20
        number = [number stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
        number = [self filterSpecialString:number];
        //1⃣️判断位数
        if (number.length != 15 && number.length != 18) {
            return NO;
        }
        //2⃣️将15位身份证转为18位
        NSMutableString *mString = [NSMutableString stringWithString:number];
        if (number.length == 15) {
            //出生日期加上年的开头
            [mString insertString:@"19" atIndex:6];
            //最后一位加上校验码
            [mString insertString:[self getLastIdentifyNumberForIdentifyNumber:mString] atIndex:[mString length]];
            number = mString;
        }
        //3⃣️开始判断
        NSString *mmdd = @"(((0[13578]|1[02])(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)(0[1-9]|[12][0-9]|30))|(02(0[1-9]|[1][0-9]|2[0-8])))";
        NSString *leapMmdd = @"0229";
        NSString *year = @"(19|20)[0-9]{2}";
        NSString *leapYear = @"(19|20)(0[48]|[2468][048]|[13579][26])";
        NSString *yearMmdd = [NSString stringWithFormat:@"%@%@", year, mmdd];
        NSString *leapyearMmdd = [NSString stringWithFormat:@"%@%@", leapYear, leapMmdd];
        NSString *yyyyMmdd = [NSString stringWithFormat:@"((%@)|(%@)|(%@))", yearMmdd, leapyearMmdd, @"20000229"];
        //区域
        NSString *area = @"(1[1-5]|2[1-3]|3[1-7]|4[1-6]|5[0-4]|6[1-5]|82|[7-9]1)[0-9]{4}";
        NSString *regex = [NSString stringWithFormat:@"%@%@%@", area, yyyyMmdd  , @"[0-9]{3}[0-9Xx]"];
        NSPredicate *regexTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
        
        if (![regexTest evaluateWithObject:number]) {
            return NO;
        }
        //4⃣️验证校验码
        return [[self getLastIdentifyNumberForIdentifyNumber:number] isEqualToString:[number substringWithRange:NSMakeRange(17, 1)]];
    }
}
/**
 *  从身份证里面获取性别man 或者 woman 不正确的身份证返回nil
 *
 *  @param number 身份证
 *
 *  @return
 */
+ (NSString *)getGenderFromIdentityNumber:(NSString *)number
{
    if ([self checkIdentityNumber:number]) {
        number = [self filterSpecialString:number];
        NSInteger i = [[number substringWithRange:NSMakeRange(number.length - 2, 1)] integerValue];
        if (i % 2 == 1) {
            return @"man";
        } else {
            return @"woman";
        }
    } else {
        return nil;
    }
}
/**
 *  从身份证获取生日,身份证格式不正确返回nil,正确返回:1990年01月01日
 *
 *  @param number 身份证
 *
 *  @return
 */
+ (NSString *)getBirthdayFromIdentityNumber:(NSString *)number
{
    if ([self checkIdentityNumber:number]) {
        number = [self filterSpecialString:number];
        if (number.length == 18) {
            return [NSString stringWithFormat:@"%@年%@月%@日",[number substringWithRange:NSMakeRange(6,4)], [number substringWithRange:NSMakeRange(10,2)], [number substringWithRange:NSMakeRange(12,2)]];
        }
        if (number.length == 15) {
            return [NSString stringWithFormat:@"19%@年%@月%@日",[number substringWithRange:NSMakeRange(6,2)], [number substringWithRange:NSMakeRange(8,2)], [number substringWithRange:NSMakeRange(10,2)]];
        };
        return nil;
    } else {
        return nil;
    }
}

+ (NSString *)getLastIdentifyNumberForIdentifyNumber:(NSString *)number {
    //位数不小于17
    if (number.length < 17) {
        return nil;
    }
    //加权因子
    int R[] = {7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2};
    //校验码
    unsigned char sChecker[11] = {'1','0','X','9','8','7','6','5','4','3','2'};
    long p =0;
    for (int i =0; i<=16; i++){
        NSString * s = [number substringWithRange:NSMakeRange(i, 1)];
        p += [s intValue]*R[i];
    }
    //校验位
    int o = p%11;
    NSString *string_content = [NSString stringWithFormat:@"%c",sChecker[o]];
    return string_content;
}

#pragma mark - JSON和字典、数组
/**
 *  JSON字符串转字典或者数组
 *
 *  @param string JSON字符串
 *
 *  @return 返回字典或者数组
 */
id JSONTransformToDictionaryOrArray(NSString *string)
{
    NSError *error;
    id object = [NSJSONSerialization JSONObjectWithData:[string dataUsingEncoding:NSUTF8StringEncoding] options:(NSJSONReadingMutableContainers) error:&error];
    if (error != nil) {
#ifdef DEBUG
        NSLog(@"fail to get dictioanry or array from JSON: %@, error: %@", string, error);
#endif
    }
    return object;
}

/**
 *  字典或者数组转为JSON字符串
 *
 *  @param object 字典或者数组
 *
 *  @return 返回字符串
 */
NSString *dictionaryOrArrayTransformToString(id object)
{
    if (![object isKindOfClass:[NSArray class]] && ![object isKindOfClass:[NSDictionary class]])
    {
        return nil;
    }
    NSError *error;
    //options为0 则不会有换行符和空格   NSJSONWritingPrettyPrinted有空格和换行符方便阅读
    NSData *data = [NSJSONSerialization dataWithJSONObject:object options:(0) error:&error];
    if (error != nil) {
#ifdef DEBUG
        NSLog(@"fail to get JSON from object: %@, error: %@", object, error);
#endif
    }
    return [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
}


#pragma mark - 屏幕截图的几种方式

/**
 *  屏幕截图有状态栏
 *
 *  @param type 图片保存位置
 *
 *  @return
 */
+ (UIImage *)imageWithScreenshotWithCaptureType:(CaptureType)type
{
    CGSize imageSize = [UIScreen mainScreen].bounds.size;
    UIGraphicsBeginImageContextWithOptions(imageSize, YES, 0);
    
    for (UIWindow *window in [UIApplication sharedApplication].windows) {
        if (window.screen == [UIScreen mainScreen]) {
            [window drawViewHierarchyInRect:[UIScreen mainScreen].bounds afterScreenUpdates:NO];
        }
    }
    UIView *statusBar = [[UIApplication sharedApplication] valueForKey:@"statusBar"];
    [statusBar drawViewHierarchyInRect:statusBar.bounds afterScreenUpdates:NO];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    [self saveImage:image WithCaptureType:type];

    return image;
}


/**
 *  屏幕截图没有状态栏
 *
 *  @param type 图片保存位置
 *
 *  @return
 */
+ (UIImage *)imageWithScreenshotNoStatusBarWithCaptureType:(CaptureType)type
{
    CGSize size = [UIScreen mainScreen].bounds.size;
    
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    
    CGContextRef context = UIGraphicsGetCurrentContext();
    for (UIWindow *window in [UIApplication sharedApplication].windows)
    {
        if (window.screen == [UIScreen mainScreen]) {
            CGContextSaveGState(context);
            CGContextTranslateCTM(context, window.center.x, window.center.y);
            CGContextConcatCTM(context, window.transform);
            CGContextTranslateCTM(context, -window.bounds.size.width *window.layer.anchorPoint.x, -window.bounds.size.height *window.layer.anchorPoint.y);
            [window.layer renderInContext:context];
            CGContextRestoreGState(context);
        }
        
    }
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    [self saveImage:image WithCaptureType:type];
    return image;
    
}

/**
 *  给一个view截图
 *
 *  @param type 图片保存位置
 *
 *  @return
 */
+ (UIImage *)imageForView:( UIView * _Nonnull )view withCaptureType:(CaptureType)type
{
    CGSize size = view.bounds.size;
    
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    [view.layer renderInContext:context];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    [self saveImage:image WithCaptureType:type];
    return image;
    
}

/**
 *  保存image到指定的位置
 *
 *  @param image image
 *  @param type  类型
 */
+ (void)saveImage:(UIImage *)image WithCaptureType:(CaptureType)type
{
    
    NSData *data = UIImagePNGRepresentation(image);
    /**
     *  时间戳
     */
    NSString *time =[NSString stringWithFormat:@"%.0f", [[NSDate date] timeIntervalSince1970]];
    switch (type) {
        case CaptureTypeSandbox:
        {
            [data writeToFile:pathCachesWithFileName([NSString stringWithFormat:@"%@_mainScrren_status.png",time]) atomically:YES];
        }
            break;
        case CaptureTypePhotes:
        {
            [data writeToFile:pathCachesWithFileName([NSString stringWithFormat:@"%@_mainScrren_status.png",time]) atomically:YES];
            
        }
            break;
        case CaptureTypeBoth:
        {
            [data writeToFile:pathCachesWithFileName([NSString stringWithFormat:@"%@_mainScrren_status.png",time]) atomically:YES];
            [data writeToFile:pathCachesWithFileName([NSString stringWithFormat:@"%@_mainScrren_status.png",time]) atomically:YES];
        }
            break;
        default:
            break;
    }
}

// 指定回调方法
+ (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    NSString *msg = nil ;
#ifdef DEBUG
    if(error != NULL)
    {
        msg = @"保存图片失败" ;
    } else {
        msg = @"保存图片成功" ;
    }
#endif
}

#pragma mark - 获取当前Controller
//获取当前屏幕显示的viewcontroller
+ (UIViewController *)getCurrentVC
{
    UIViewController *result = nil;
    
    UIWindow * window = [[UIApplication sharedApplication] keyWindow];
    if (window.windowLevel != UIWindowLevelNormal)
    {
        NSArray *windows = [[UIApplication sharedApplication] windows];
        for(UIWindow * tmpWin in windows)
        {
            if (tmpWin.windowLevel == UIWindowLevelNormal)
            {
                window = tmpWin;
                break;
            }
        }
    }
    UIView *frontView = [[window subviews] objectAtIndex:0];
    id nextResponder = [frontView nextResponder];
    
    if ([nextResponder isKindOfClass:[UIViewController class]])
        result = nextResponder;
    else
        result = window.rootViewController;
    
    return result;
}

+ (UIViewController *)findViewController:(UIView *)sourceView
{
    id target = sourceView;
    while (target) {
        target = ((UIResponder *)target).nextResponder;
        if ([target isKindOfClass:[UIViewController class]]) {
            break;
        }
    }
    return target;
}