Creating a placeholder UIImage dynamically with color

README.md

Creating a placeholder UIImage dynamically with color

Ever needed a placeholder color for your lazy loaded table view cell image view? Typically can create a 1x1 pixel image in PhotoShop, add it to your project, then load it with UIImageNamed. Can't imagine how lots of effort and steps, and if the placeholder color are requested to be updated, you'd have to repeat the process all over again.

If you needed work with this kind of situations a lot, lets do it programmatically and DRY! Consider the following UIImage-JTColor category.

<script src="https://gist.github.com/1571875.js?file=UIImage-JTColor.h"> </script> <script src="https://gist.github.com/1571875.js?file=UIImage-JTColor.m"> </script>

Usage:

#import "UIImage-JTColor.h"

UIColor *color = [UIColor lightGrayColor];   // Or your whatever UIColor
imageView.image = [UIImage imageWithColor:color];

Nothing magical but will saves you a lot of time.

LICENSE

Copyright (c) 2013 Jamz Tang <jamz@jamztang.com>
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is furnished
to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

UIImage-JTColor.h

/*
 * This file is part of the http://ioscodesnippet.com
 * (c) Jamz Tang <jamz@jamztang.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

#import <UIKit/UIKit.h>

@interface UIImage (JTColor)

+ (UIImage *)imageWithColor:(UIColor *)color;

@end

UIImage-JTColor.m

/*
 * This file is part of the http://ioscodesnippet.com
 * (c) Jamz Tang <jamz@jamztang.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

#import "UIImage-JTColor.h"

@implementation UIImage (JTColor)

+ (UIImage *)imageWithColor:(UIColor *)color {
    CGRect rect = CGRectMake(0, 0, 1, 1);
    // Create a 1 by 1 pixel context
    UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
    [color setFill];
    UIRectFill(rect);   // Fill it with your color
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

@end

UIImage-JTColor.podspec

Pod::Spec.new do |s|
  s.name         = "UIImage-JTColor"
  s.version      = "0.0.1"
  s.summary      = "Creating a placeholder UIImage dynamically with color."
  s.homepage     = "https://gist.github.com/jamztang/1571875"
  s.author       = { "Jamz Tang" => "jamz@jamztang.com" }
  s.platform     = :ios
  s.source       = { :git => "git://gist.github.com/1571875.git", :tag => '0.0.1' }
  s.requires_arc = true
  s.ios.deployment_target = '5.0'
  s.source_files  = '*.{h,m}'
  s.license      = { :type => 'MIT', :file => 'LICENSE' }
end

Loving it, hope it stays here so I can use it in my podfiles!