iOS相册的访问（读写操作）

加载图片

//点击加载图片按钮

- (IBAction)picture:(id)sender {

UIImagePickerController*picker = [[UIImagePickerControlleralloc]init];

//设置数据源，图片显示的来源是什么，可以是相机、照片薄、或者图片库

picker.sourceType=UIImagePickerControllerSourceTypeSavedPhotosAlbum;

//设置的代理

picker.delegate=self;

// model出相册的控制器的View

[selfpresentViewController:pickeranimated:YEScompletion:nil];

}

//当点击了加载图片按钮之后需要遵守协议

- (void)imagePickerController:(UIImagePickerController*)picker     didFinishPickingMediaWithInfo:(NSDictionary*)info{

//这里会加载选中的图片，并将他显示到一个单独的imageView中

//从字典信息中选择保存的图片键值对;

UIImage*image = info[UIImagePickerControllerOriginalImage];

ZHHandleImageView*imagV = [[ZHHandleImageViewalloc]initWithFrame:_drawView.bounds];

imagV.image= image;

[_drawViewaddSubview:imagV];

// dismiss modle出的控制器(退出照片选择器)

[pickerdismissViewControllerAnimated:YEScompletion:nil];

}

读取图片

- (IBAction)save:(id)sender {

//截图，并保存到相册中，

UIImageWriteToSavedPhotosAlbum([UIImagecaptureWithView:_drawView],self,@selector(image:didFinishSavingWithError:contextInfo:),nil);

}

//点击保存按钮之后的提示,这是系统推荐的必须实现的方法，没有提示，只能从写入相册的提示中找

- (void)image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:    (void*)contextInfo{

if(error) {

[MBProgressHUDshowError:@"保存失败"];

}else{

[MBProgressHUDshowSuccess:@"保存成功"];

}

}

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