将UIView转成UIImage,将UIImage转成PNG/JPG


  1. //把UIView 转换成图片  
  2. -(UIImage *)getImageFromView:(UIView *)view{  
  3.          UIGraphicsBeginImageContext(view.bounds.size);  
  4.          [view.layer renderInContext:UIGraphicsGetCurrentContext()];  
  5.          UIImage *image = UIGraphicsGetImageFromCurrentImageContext();  
  6.          UIGraphicsEndImageContext();  
  7.          return image;  
  8. }  


  9. //UIImage -> PNG / JPG
  10. // Create paths to output images
  11. NSString *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.png"];
  12. NSString *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"];

  13. // Write a UIImage to JPEG with minimum compression (best quality)
  14. // The value 'image' must be a UIImage object
  15. // The value '1.0' represents image compression quality as value from 0.0 to 1.0

  16. [UIImageJPEGRepresentation(image, 1.0) writeToFile:jpgPath atomically:YES];

  17. // Write image to PNG
  18. [UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];

  19. // Let's check to see if files were successfully written...
  20. // Create file manager
  21. NSError *error;
  22. NSFileManager *fileMgr = [NSFileManager defaultManager];

  23. // Point to Document directory
  24. NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];

  25. // Write out the contents of home directory to console
  26. NSLog(@"Documents directory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]);

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