Cutting skills in iPhone applications

DetailsIPhone applicationsMediumCutting skillsThis is the content to be introduced in this article. It mainly introduces the application skills in the iphone, but there are not many content. Let's take a look at the details.IPhone applicationsInCutting skillsList.

1. Obtain the image Context

2. Construct the cut path (SHAPE)

3. Build a cut area

4. paste your painting

 
 

  
  
// 1CGContextRef context = UIGraphicsGetCurrentContext();  
  
  
// 2CGRect bounds = CGRectMake(0.0f, 0.0f, SIDELENGTH, SIDELENGTH);  
  
  
 
  
  
CGMutablePathRef path = CGPathCreateMutable();CGPathAddEllipseInRect(path, NULL, bounds);  
  
  
// 3CGContextAddPath(context, path);CGContextClip(context);  
  
  
// 4[LOGO drawInRect:bounds]; 
 
 

Screenshot

 
 

  
  
// Create a bitmap-based image context and specify the size as CGSizeMake (200,400)
  
  
UIGraphicsBeginImageContext (CGSizeMake (200,400 ));
  
  
 
  
  
// RenderInContext presents the receiver and Its subrange to the specified context
  
  
[Self. view. layer renderInContext: UIGraphicsGetCurrentContext ()];
  
  

  
  
// Returns an image based on the current image context.
  
  
UIImage * aImage = UIGraphicsGetImageFromCurrentImageContext ();
  
  

  
  
// Remove the image context at the top of the stack based on the current bitmap
  
  
UIGraphicsEndImageContext ();
  
  
 
  
  
// Return the data of the specified image in png format
  
  
ImageData = UIImagePNGRepresentation (aImage );
 
 

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