These source codes are for iOS which has similar functionality like photoshop such as any image filter, cut and resize, blur effect, add text, adjustment and other. Check out these link below for more detail.
Apply great effects on your photos with Pixl, a full app template with a built-in custom image editor (NO Aviary SDK).
Share your pictures and favorite images or save them to Dropbox with a nice flat custom control that you can easily add to your own app project!
Apply custom frames around your pictures and color them the way you like wth PicShape, a nice Full App Template for iPhone/iPod touch.
iWeather is a beautiful, simple and feature rich weather client for iOS.
Create and solve your own mixed puzzle to get compatible amazing image.
iGallery is a beautiful and easy to implement Photo gallery for the iOS.
A full App Template with a Built-in custom image editor.
Photo Share FX is an iPhone component and demo app.
Simple Photo Slideshow with a nice dissolve effect between pictures.