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. 
   
10. 
    
11. //UIImage -> PNG / JPG
12. // Create paths to output images
13. NSString*pngPath=[NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.png"];
14. NSString*jpgPath=[NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"];
15. 
    
16. // Write a UIImage to JPEG with minimum compression (best quality)
17. // The value 'image' must be a UIImage object
18. // The value '1.0' represents image compression quality as value from 0.0 to 1.0
19. 
    
20. [UIImageJPEGRepresentation(image,1.0) writeToFile:jpgPath atomically:YES];
21. 
    
22. // Write image to PNG
23. [UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];
24. 
    
25. // Let's check to see if files were successfully written...
26. // Create file manager
27. NSError*error;
28. NSFileManager*fileMgr=[NSFileManager defaultManager];
29. 
    
30. // Point to Document directory
31. NSString*documentsDirectory=[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
32. 
    
33. // Write out the contents of home directory to console
34. NSLog(@"Documents directory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]);