[iOS]圖片壓縮&保存View為內容Img

1、圖片的壓縮

封裝類方法

    + (UIImage)imageWithImageSimple:(UIImage)image scaledToSize:(CGSize)newSize

    {

        // Create a graphics image context

        UIGraphicsBeginImageContext(newSize);


    // Tell the old image to draw in this new context, with the desired  
    // new size  
    [image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];  

    // Get the new image from the context  
    UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();  

    // End the context  
    UIGraphicsEndImageContext();  

    // Return the new image.  
    return newImage;  
}  </pre> 



    //屏幕截圖并壓縮  
        UIImage *snapshot =  [UIImage imageWithCGImage:[AppDelegate screenShots].CGImage scale:1 orientation:UIImageOrientationLeft];  
        _updataImg =[AppDelegate imageWithImageSimple:snapshot scaledToSize:CGSizeMake(snapshot.size.width/3, snapshot.size.height/3)];  
 

 2、保存View為內容Img

    -(void)savetoLocal

    {

        _moreVC.hidden =YES;

        UIImage * saveimg=[self saveImage];

         UIImageWriteToSavedPhotosAlbum(saveimg, self, @selector(imageSavedToPhotosAlbum:didFinishSavingWithError:contextInfo:), nil);


}  
-(UIImage*)saveImage{  
    UIGraphicsBeginImageContext(CGSizeMake(self.view.bounds.size.width, self.view.bounds.size.height - 20));//保存self.view上的內容  
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];  
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();  
    return viewImage;  
}  

- (void)imageSavedToPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(voidvoid *)contextInfo  
{  
    NSString *message = @"呵呵";  
    if (!error) {  
        message = @"成功保存到相冊";  
    }else  
    {  
        message = [error description];  
    }  
    NSLog(@"message is %@",message);  
}  </pre>