将UIView中的图像保存到相册

- (IBAction)btnClicked:(id)sender {
    UIImage *image = [self getImageFormView:self.editView];
    
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
    
}
//UIImageWriteToSavedPhotosAlbum方法所需要的回调方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error) {
        NSLog(@"%@",[error localizedDescription]);
    }else{
        UIAlertView *av = [[UIAlertView alloc] initWithTitle:@"提示" message:@"保存成功！" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles: nil];
        [av show];
        [av release];
    }
}

-(UIImage*)getImageFormView:(UIView*)view{
    //创建一个画布
    UIGraphicsBeginImageContext(view.frame.size);
    //将view的内容渲染到画布中
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    //结束
    UIGraphicsEndImageContext();
    return image;
}