将UIView转成UIImage,将UIImage转成PNG/JPG

1. //UIView -> UIImage
2. #import “QuartzCore/QuartzCore.h”  
3. //把UIView 转换成图片  
4. -(UIImage *)getImageFromView:(UIView *)view{  
5.          UIGraphicsBeginImageContext(view.bounds.size);  
6.          [view.layer renderInContext:UIGraphicsGetCurrentContext()];  
7.          UIImage *image = UIGraphicsGetImageFromCurrentImageContext();  
8.          UIGraphicsEndImageContext();  
9.          return image;  
10. }  
11. 
    
12. 
    
13. //UIImage -> PNG / JPG
14. // Create paths to output images
15. NSString *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.png"];
16. NSString *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"];
17. 
    
18. // Write a UIImage to JPEG with minimum compression (best quality)
19. // The value 'image' must be a UIImage object
20. // The value '1.0' represents image compression quality as value from 0.0 to 1.0
21. 
    
22. [UIImageJPEGRepresentation(image, 1.0) writeToFile:jpgPath atomically:YES];
23. 
    
24. // Write image to PNG
25. [UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES];
26. 
    
27. // Let's check to see if files were successfully written...
28. // Create file manager
29. NSError *error;
30. NSFileManager *fileMgr = [NSFileManager defaultManager];
31. 
    
32. // Point to Document directory
33. NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"];
34. 
    
35. // Write out the contents of home directory to console
36. NSLog(@"Documents directory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]);

http://blog.163.com/lzb4319@126/blog/static/7255470020125693048341/