UIImage is an Objective-C class that represents a bitmap image.
Undocumented methods
-_applicationIconImagePrecomposed: & -_smallApplicationIconImagePrecomposed:
Signature | -(UIImage*)_applicationIconImagePrecomposed:(BOOL)precomposed; |
---|---|
Available in | 2.0 – |
Signature | -(UIImage*)_smallApplicationIconImagePrecomposed:(BOOL)precomposed; |
---|---|
Available in | 2.0 – |
These methods resize an image to icon size (59×59) or small icon size (29×29), clip out a rounded rectangle, draw shadows and apply a glossy overlay if required (when precomposed == NO), so that it resembles an icon.
If the input image is rectangular, the largest square portion in the top-left corner will be used.
Example:
@interface UIImage (privateAPI) -(UIImage*)_applicationIconImagePrecomposed:(BOOL)precomposed; @end ... UIImage *regularIcon = [UIImage imageNamed:@"regularIcon.png"]; UIImage *renderedIcon = [regularIcon _applicationIconImagePrecomposed:NO]; NSData *pngData = UIImagePNGRepresentation( renderedIcon ); [pngData writeToFile:@"/tmp/roundedIcon.png" atomically:YES];
_flatImageWithWhite:alpha:
Signature | -(UIImage*)_flatImageWithWhite:(CGFloat)white alpha:(CGFloat)alpha; |
---|---|
Available in | 2.0 – |
Create an image having the same size as the original image, but filled with the solid color as the parameters.
_bezeledImageWithRed:green:blue:alpha:
Signature | -(UIImage*) _bezeledImageWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha; |
---|---|
Available in | 2.0 – |
Create a solid white image having the same size as the original image, and then stroke the top 1px edge by the specified color.
_imageScaledToSize:interpolationQuality: & _imageScaledToProportion:interpolationQuality:
Signature | -(UIImage*)_imageScaledToSize:(CGSize)newSize interpolationQuality:(CGInterpolationQuality)quality; |
---|---|
Available in | 2.0 – |
Signature | -(UIImage*)_imageScaledToProportion:(CGFloat)scale interpolationQuality:(CGInterpolationQuality)quality; |
---|---|
Available in | 2.0 – |
Rescale the image to the new size.
+kitImageNamed:
Signature | +(UIImage*)kitImageNamed:(NSString*)name; |
---|---|
Available in | 2.0 – |
Equivalent to _UIImageWithName(name).
+defaultDesktopImage
Signature | +(UIImage*)defaultDesktopImage; |
---|---|
Available in | 2.0 – |
Return the user's lock screen image.
+setDesktopImageData:
Signature | +(void)setDesktopImageData:(NSData*)jpegData; |
---|---|
Available in | 2.0 – |
Replace the user's lock screen image by the given JPEG data.
Undocumented C functions
_UIImageWithName
Signature | UIImage* _UIImageWithName(NSString* name); |
---|---|
Available in | 2.0 – |
Obtain a built-in image. The name are stored in UIKit.framework/*.artwork. There are various ways to extract this information[1][2][3], and you can grab a (slightly outdated) list from http://test.saurik.com/winterboard/UIImages.txt.
UIImageDataWriteToSavedPhotosAlbum
Signature | void UIImageDataWriteToSavedPhotosAlbum(NSData* imageData, id target, SEL selector, void* context); |
---|---|
Available in | 3.1 – |
Write the image data to photos album. This is similar to UIImageWriteToSavedPhotosAlbum function in the SDK, except that you can choose the image format (the extension will always be *.jpg, however).
UIGetScreenImage
Signature | CGImageRef UIGetScreenImage(); |
---|---|
Available in | 2.0 – |
"Print screen" and returns the image. Note that this is a CGImage, so you need to convert it to a UIImage with +[UIImage imageWithCGImage:].
Note that, although being a "Get" function, the returned image actually has retain count of +1, and the caller (you) are responsible to CGImageRelease it.
Starting from 2009 Dec 14th, this function can be used for SDK apps[4].
References
- ↑ iPhoneShop http://code.google.com/p/iphoneshop/ – may not work on 3.x
- ↑ http://svn.saurik.com/repos/menes/trunk/winterboard/UIImages.mm
- ↑ http://code.google.com/p/networkpx/source/browse/etc/dump-artwork.m – Tested only on 3.x
- ↑ http://www.steveperks.co.uk/post/Apple-Allows-UIGetScreenImage-For-iPhone.aspx
- Official documentation: http://developer.apple.com/iphone/library/documentation/uikit/reference/UIImage_Class/Reference/Reference.html
- Extra header: http://github.com/kennytm/iphone-private-frameworks/blob/master/UIKit/UIImage2.h