//访问保存照片
UIImageWritetoSavedPhotosAlbum(UIImage *image,id completionTarget,SEL completionSelector,void *contextInfo);
//只能调用这个方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;
//Swfit2.0中要改变这个方法 - (void)image:(UIImage *)image
didFinishSavingWithError:(NSError *)
error
contextInfo:
(void *)
contextInfo;
改变方法为：
//解释：didFinishSavingWithError为外部参数。 在OC中有两个contextInfo ，Swift中自动推断后，删除一个contextInfo.
@objc private func image(image: UIImage,didFinishSavingWithError error:NSError?,contextInfo: AnyObject) {
print("保存成功")}
调用：
UIImageWritetoSavedPhotosAlbum(image,self,"image:didFinishSavingWithError:contextInfo:",nil)