/**
* 将图片保存到iPhone本地相册
* UIImage *image 图片对象
* id completionTarget 响应方法对象
* SEL completionSelector 方法
* void *contextInfo
*/
UIImageWriteToSavedPhotosAlbum(self.imageView.image,self, @selector(image:didFinishSavingWithError:contextInfo:),nil);
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
if (error ==nil) {
self.alertView.alertLabel.text = @"已存入手机相册";
}else{
self.alertView.alertLabel.text = @"保存失败";
}