sns 공유 (Twitter, Facebook, Line)

+ (void)postToTwitter:(UIViewController *)originController  withData:(NSDictionary *)dic {

    SLComposeViewController *tweetSheet = [SLComposeViewController

                                           composeViewControllerForServiceType:

                                           SLServiceTypeTwitter];

    tweetSheet.completionHandler = ^(SLComposeViewControllerResult result) {

        switch(result) {

                //  This means the user cancelled without sending the Tweet

            case SLComposeViewControllerResultCancelled:

                break;

                //  This means the user hit 'Send'

            case SLComposeViewControllerResultDone:

                break;

        }

    };

    

    //  Set the initial body of the Tweet

    [tweetSheet setInitialText:[dic valueForKey:@"text"]];

    NSString *imageUrl = [dic valueForKey:@"imageurl"];

    [NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:imageUrl]] queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {

        if(![tweetSheet addImage:[UIImage imageWithData:data]]) {

            NSLog(@"Unable to add the image!");

        } else {

            if (![tweetSheet addURL:[NSURL URLWithString:[dic valueForKey:@"referenceurl"]]]){

                NSLog(@"Unable to add the URL!");

            }

            [originController presentViewController:tweetSheet animated:YES completion:^{

                NSLog(@"Tweet sheet has been presented.");

            }];

        }

    }];

}

+ (void)postToFacebook:(UIViewController *)originController withData:(NSDictionary *)dic {

    SLComposeViewController *facebookSheet = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];

    

    [facebookSheet setInitialText:[dic valueForKey:@"text"]];

    [facebookSheet addURL:[NSURL URLWithString:[dic valueForKey:@"referenceurl"]]];

    NSString *imageUrl = [dic valueForKey:@"imageurl"];

    [NSURLConnection sendAsynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:imageUrl]] queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {

        [facebookSheet addImage:[UIImage imageWithData:data]];

    }];

    

    [originController presentViewController:facebookSheet animated:YES completion:Nil];

}

+ (void)postToLine:(UIViewController *)originController withData:(NSDictionary *)dic {

    //텍스트 전송 와 링크 전송

    NSString *_resultString = [[NSString stringWithFormat:@"%@%@",[dic valueForKey:@"text"],[dic valueForKey:@"imageurl"]] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSString *LineUrlString = [NSString stringWithFormat:@"line://msg/text/%@",_resultString];

    BOOL r =[[UIApplication sharedApplication] openURL:[NSURL URLWithString:LineUrlString]];

    if (!r) {

        [[[UIAlertView alloc] initWithTitle:@"" message:@"LINEがインストールされていません。" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil,nil] show];

    }

}

이미지 리사이징(이율 유지)

//이미지 비율을 유지하면서 최대 가로 or 높이보다 작은 이미지 사이즈 생성

+ (UIImage *)getScaledImage:(UIImage *)image scaledToMaxWidth:(CGFloat)width maxHeight:(CGFloat)height {

    CGFloat oldWidth = image.size.width;

    CGFloat oldHeight = image.size.height;

    

    if (oldWidth < width && oldHeight < height)

        return image;

    

    CGFloat scaleFactorW =1;

    CGFloat scaleFactorH =1;

    

    if (oldWidth > width)

        scaleFactorW = width / oldWidth;

    if(oldHeight > height)

        scaleFactorH = height / oldHeight;

    

    CGFloat scaleFactor = (scaleFactorW<scaleFactorH)?scaleFactorW:scaleFactorH;

    

    

    CGFloat newHeight = oldHeight * scaleFactor;

    //CGFloat newWidth = oldWidth * scaleFactor;

    CGSize newSize = CGSizeMake(width, newHeight);

    

    UIGraphicsBeginImageContext(newSize);

    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return newImage;

}

//이미지 비율을 유지하면서 최대 가로 보다 작은 이미지 사이즈 생성

+ (UIImage *)getScaledImage:(UIImage *)image scaledToMaxWidth:(CGFloat)width {

    CGFloat oldWidth = image.size.width;

    CGFloat oldHeight = image.size.height;

    

    CGFloat scaleFactor=1;

    

    if (oldWidth > width) {

        scaleFactor = width / oldWidth;

    } else  //oldWidth<width and height==0이면, scale하지 않음.

        return image;

    

    CGFloat newHeight = oldHeight * scaleFactor;

    CGFloat newWidth = oldWidth * scaleFactor;

    CGSize newSize = CGSizeMake(newWidth, newHeight);

    

    UIGraphicsBeginImageContext(newSize);

    [image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    

    return newImage;

}

이미지 패턴으로 컬러값 지정

[UIColor colorWithPatternImage:[UIImage imageNamed:@"이미지 이름"];

example)

//배경을 bh_sand.png 파일로 설정 하기

self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"bg_sand"]];