OC shear picture frame with wallpaper made xs

Functional Description:

　　Can only cut just right for xs wallpaper, wallpaper borders appear easy to make.

Ideas Description:

　　ScrollView will need to use the picture painted on the inside of the custom ImageView inside size of the image width or length equal to only a ScrollView length and width, this can only slide up and down or left and right.

　　Currently defects: When no operation is performed when any of the slide, and slidable vertically, direct compression screenshots will cause the entire screen into which the corresponding screenshot. The solution is to rewrite a judge (lazy

Controls used

　　UIImageView UIScrollView

Implementation steps decomposition:

　　1. corresponding to the protocol required to achieve

<UIScrollViewDelegate,UIImagePickerControllerDelegate,UINavigationControllerDelegate>

　　2. Set the scale corresponding percentages, ratios ScrollView slidable time direct proportion screenshot 

float imageOffset_X = 0.0;
float imageOffset_X_All= 0.00001;
float imageOffset_Y= 0.0;
float imageOffset_Y_All= 0.00001;

 　　3. The size of the initialization ScrollView

    // adaptive sliding back and forth or left and right can be 
    IF ((a float) image.size.width / (a float) 200 is> (a float) image.size.height / (a float) 433) 
    { 
        contentOfIamge = [[the UIImageView the alloc] the initWithFrame: CGRectMake (0, 0, 433 * ( (float) image.size.width / (float) image.size.height), 433)]; // set slide width 
        
        imageOffset_X_All = 433.0 * ((float) image.size.width / (a float) image.size.height); 
    } 
    the else 
    { 
        contentOfIamge = [[the UIImageView the alloc] the initWithFrame: CGRectMake (0, 0, 200 is, * 200 is ((a float) image.size.height / (a float) image.size.width ))]; // set the sliding length 
        imageOffset_Y_All 200.0 * = ((a float) image.size.height / (a float) image.size.width); 
    } 
    _scrollView.contentSize = contentOfIamge.bounds.size; // not set then it can not slide may appear

 　　4. The operation of the cutting and framing

    Image2 = * UIImage [UIImage imageNamed: imageName2]; 
    // UIImage * Image = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @ "222.png" ofType: nil]]; // This method does not cache 
    
    UIGraphicsBeginImageContext (image2 .size); 
    
    // portion can be optimized, some cases total thumbnail compressed, but on the other slide a little bit with the correct way 
    if (imageOffset_Y> imageOffset_X) { 
        move NSLog (@ "up and down, the percentage is obtained: F% ", imageOffset_Y / imageOffset_Y_All); 
        a float offset_pesent = imageOffset_Y / imageOffset_Y_All; 
        
        // shearing operation 
        CGImageRef sourceImageRef = [image1 CGImage]; // Get original picture shear required 
        CGRect rect = CGRectMake (0, image1.size . height * offset_pesent, image1.size.width, image1.size.width * (image2.size.height / image2.size.width)); // set the cut image regions
        NSLog (@ "position intended to cut size:% @", NSStringFromCGRect (RECT));  
        CGImageRef newImageRef = CGImageCreateWithImageInRect (sourceImageRef, RECT); // be tailored according to a given rectangular area
        UIImage newimage * = [UIImage imageWithCGImage: newImageRef]; // UIImage converted into usable 
        
        UIGraphicsBeginImageContext (image2.size); // size is CGSize type that you need the image size, image rendering in your mask h above 
        [newImage drawInRect: CGRectMake (0, 0, image2.size.width, image2.size.height)]; // will cut cut the resulting image painted on canvas 
　　　　// here to enter your own mask 
        UIImage * scaledImage = UIGraphicsGetImageFromCurrentImageContext (); // get the current image 
        CGImageRelease (newImageRef); // free the memory 
        UIGraphicsEndImageContext (); // close the second 
        
        UIGraphicsEndImageContext (); // close the first 
        
        return scaledImage; // returns is has changed the picture 
    }

 

A more detailed reference to my github address: https: //github.com/Marshall-Hu/HSF_WallpaperMaker