How to change image tint color in iphone sdk?

Hi all,


This category takes an image (presumably flat and solid-colored, like a toolbar icon), and fills its non-transparent pixels with a given color. You can optionally also specify a fractional opacity at which to composite the original image over the color-filled region, to give a tinting effect.

This is very useful for generating multiple different-colored versions of the same image, for example 'disabled' or 'highlighted' states of the same basic image, without having to make multiple different-colored bitmap image files.

So, Just make two different files named as : "UIImage+Tint.h" and  "UIImage+Tint.m"


1) For  "UIImage+Tint.h" contents will be ..

#import <UIKit/UIKit.h>

@interface UIImage (ImageTint)

- (UIImage *)imageTintedWithColor:(UIColor *)color;
@end


2) For  "UIImage+Tint.m" contents will be ..
 
#import "UIImage+Tint.h"

@implementation UIImage (ImageTint)

- (UIImage *)imageTintedWithColor:(UIColor *)color
{
    if (color) {
        // Construct new image the same size as this one.
        UIImage *image;
        UIGraphicsBeginImageContextWithOptions([self size], NO, 0.0); // 0.0 for scale means "scale for device's main screen".
        CGRect rect = CGRectZero;
        rect.size = [self size];
       
        // tint the image
        [self drawInRect:rect];
        [color set];
        UIRectFillUsingBlendMode(rect, kCGBlendModeMultiply);
       
        // restore alpha channel
        [self drawInRect:rect blendMode:kCGBlendModeDestinationIn alpha:1.0f];
       
        image = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
       
        return image;
    }
   
    return self;
}
@end

3) Now you can import "UIImage+Tint.h" file into your class where you want colorful images and do below code.

   UIImage *imgMail = [UIImage imageNamed:@"icon_mail.png"];
    imgMail = [imgMail imageTintedWithColor:MENU_COLOR]; //Colorful image


Important Note : Images will be preferred transparent only .

Thanks,
Nilesh M. Prajapati

How to capture snapshot of UIWebview in iPhone?

Hi everyone,
Have you ever tried to take a picture of "UIWebView" in any of your applications? Now, you can do it by following below code in your project. You can use scrollview property of UIWebView in iOS 5.0 and later SDK.

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

For example:

#pragma mark --------------------
#pragma mark Take screenshot from Webview
#pragma mark --------------------


UIWebView *receiptWeb;
- (UIImage *)takeScreenshotFromWebview
{
    UIImage *img = nil;
    if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"5.0"))
    {
        UIGraphicsBeginImageContextWithOptions(receiptWeb.scrollView.contentSize, receiptWeb.scrollView.opaque, 0.0);
        {
            CGPoint savedContentOffset = receiptWeb.scrollView.contentOffset;
            CGRect savedFrame = receiptWeb.scrollView.frame;
          
            receiptWeb.scrollView.contentOffset = CGPointZero;
            receiptWeb.scrollView.frame = CGRectMake(0, 0, receiptWeb.scrollView.contentSize.width, receiptWeb.scrollView.contentSize.height);
            [receiptWeb.scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
            img = UIGraphicsGetImageFromCurrentImageContext();
          
            receiptWeb.scrollView.contentOffset = savedContentOffset;
            receiptWeb.scrollView.frame = savedFrame;
        }
        UIGraphicsEndImageContext();
    }
    else
    {
        for (id subview in receiptWeb.subviews)
        {
            if ([subview isKindOfClass:[UIScrollView class]])
            {
                UIScrollView *scrollView = (UIScrollView *)subview;
                UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, scrollView.opaque, 0.0);
                {
                    CGPoint savedContentOffset = scrollView.contentOffset;
                    CGRect savedFrame = scrollView.frame;
                  
                    scrollView.contentOffset = CGPointZero;
                    scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);
                    [scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
                    img = UIGraphicsGetImageFromCurrentImageContext();
                  
                    scrollView.contentOffset = savedContentOffset;
                    scrollView.frame = savedFrame;
                }
                UIGraphicsEndImageContext();
            }
        }
    }
    return img;
}

Regards,
Nilesh Prajapati