保存图片到IPhone图片库中

void UIImageWriteToSavedPhotosAlbum (
UIImage *image,   // 要保存到用户设备中的图片
id completionTarget,  //可选的参数，当保存完成后，回调方法所在的对象
SEL completionSelector,  //可选的参数，当保存完成后，所调用的回调方法。
void *contextInfo  //可选的参数，保存了一个指向context数据的指针，它将传递给回调方法。
);

// 要保存的图片
UIImage *img = [UIImage imageNamed:@"ImageName.png"];
// 保存图片到相册中
UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
可以在保存图片的时候加个动画：
CATransition* animation = [CATransition animation];
[animation setType:@"suckEffect"];
[animation setDuration:0.5f];
[animation setTimingFunction:UIViewAnimationCurveEaseInOut];
//self.view.opaque = 1.0f;
[self.view.layer addAnimation:animation forKey:@"animationEffect"];
[self.view.layer removeAnimationForKey:@"animationEffect"];

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
//错误处理
if (error != NULL) {
// Show error message...
}
else { //保存图片成功
// Show message image successfully saved
}
}

-(UIImage *)imageFromView:(UIView *)theView {
UIGraphicsBeginImageContext(CGSizeMake(320, theView.frame.size.height));
CGContextRef context = UIGraphicsGetCurrentContext();
[theView.layer renderInContext:context];
UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return theImage;
}